Internet of Things man-machine interface development board

Abstract

The utility model relates to the technical field of development boards, in particular to an internet of things man-machine interface development board, which comprises a main control module and a display and touch control integrated module which are electrically connected, and the display and touch control integrated module comprises a display screen and a touch control chip arranged on the display screen. A communication interface of the touch control chip is electrically connected with a touch control signal input end of the main control module, and a display signal output end of the main control module is electrically connected with a display signal input end of the display screen. The communication interface transmits a touch signal to the touch signal input end of the main control module, the main control module processes the touch signal and then directly transmits a display signal to the display screen through the display signal output end, and the touch signal and the display signal are processed in a centralized mode in the main control module. Compared with a traditional separated design, an external touch control module and an independent circuit are not needed, and the overall integration level of the Internet of Things human-computer interface development board is remarkably improved; transmission delay and synchronization deviation caused by path separation are avoided, and synchronism of touch operation and display feedback is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the development board technical field, especially to a thing networking man -machine interface development board. BACKGROUND

[0002] The development board is the special hardware carrier of embedded device development, usually carries the core processing chip, and its core function is to help the developer to skip the complex process of designing hardware from zero, directly writes, debugs the code on the development board, verifies the circuit scheme and function logic quickly, and then efficiently builds the thing networking terminal, man -machine interface equipment and other products.

[0003] The existing development board although integrates the basic display function, but there is remarkable limitation on the interactive design, and the display module and touch function are usually independent of each other, and the developer needs to realize touch interaction, needs to connect the touch module externally, and is connected with the main control unit through separate circuit. This separation type design leads to low integral degree of the development board as a whole, and the transmission path of display signal and touch signal is separated, which can easily cause problems such as poor signal delay synchronization. UTILITY MODEL CONTENT

[0004] In order to solve the above problems, the utility model provides a thing networking man -machine interface development board.

[0005] The utility model solves technical problem's scheme to provide a thing networking man -machine interface development board, the thing networking man -machine interface development board includes the main control module and display touch integration module of electric connection, the display touch integration module includes the display screen and sets up the touch chip on the display screen, the communication interface of touch chip is connected with the touch signal input of main control module, the display signal output of main control module is connected with the display signal input of display screen.

[0006] Preferably, the communication interface is I2C communication interface, the signal output of touch chip is connected with the touch signal input of main control module, the signal output of I2C communication interface includes SDA pin and SCL pin, and the SDA pin and SCL pin are connected with the corresponding IO pin of main control module respectively, the display signal input of display screen includes PCLK pixel clock pin, HSYNC line synchronization pin and VSYNC field synchronization pin, and the PCLK pixel clock pin, HSYNC line synchronization pin and VSYNC field synchronization pin are connected with the corresponding IO pin of main control module respectively.

[0007] Preferably, the thing networking man -machine interface development board further includes a storage module, the storage module is connected with the main control module, the storage module includes flash memory chip and PSRAM chip, and the main control module includes at least dual-core processor.

[0008] Preferably, the Internet of Things man-machine interface development board further comprises an industrial interface module, which is electrically connected with the master control module; the industrial interface module comprises at least one of a CAN drive circuit module, an RS485 communication interface module, an isolation IO circuit module and a memory card drive circuit module.

[0009] Preferably, the industrial interface module comprises the CAN drive circuit module, which comprises a CAN drive chip U12, a CANH bus, a CANL bus and two parallel bidirectional voltage stabilizing diodes D14; the RXD pin and the TXD pin of the CAN drive chip U12 are connected with the CANRX pin and the CANTX pin of the master control module respectively; the CANH pin and the CANL pin of the CAN drive chip U12 are connected with the CANH bus and the CANL bus respectively; the CANH pin and the CANL pin are connected with one end of the two bidirectional voltage stabilizing diodes D14 respectively, and the other end of the two bidirectional voltage stabilizing diodes D14 is grounded.

[0010] Preferably, the industrial interface module comprises the RS485 communication interface module, which comprises a transceiver chip U7, a triode S1 and bidirectional voltage stabilizing diodes D11 to D13; the VCC pin of the transceiver chip U7 is connected with 5V and grounded through a capacitor C63; the RO pin is connected with 3.3V through a resistor R64, and the RO pin is connected with the UART_TX pin of the master control module as RS485 RXD end; the RE pin and the DE pin of the transceiver chip U7 are short-circuited and connected with 3.3V through a resistor R66; the A pin of the transceiver chip U7 is connected with the A1 end of the RS485 interface, and the A pin is grounded through the bidirectional voltage stabilizing diode D13; the B pin of the transceiver chip U7 is grounded through the bidirectional voltage stabilizing diode D11, and the B pin is connected with the B1 end of the RS485 interface; the bidirectional voltage stabilizing diode D12 is connected with the bidirectional voltage stabilizing diodes D11 and D13 respectively.

[0011] Preferably, the industrial interface module comprises an isolation IO circuit module, which is electrically connected with the master control module, the isolation IO circuit module comprises optocoupler T1, T3, T5, T6, triode T2, T4 and diode D4; the anode of the light emitting diode of the optocoupler T1 is connected with 3.3V through resistor R57, the cathode of the light emitting diode is connected with DO0 end, the collector of the photo triode is connected with 5V, the emitter of the photo triode is connected with the base of the triode T2 through resistor R58 and is connected with the ground through resistor R60, the DOUT0 end is connected with the collector of the triode T2, one end of the capacitor C102 is connected with the resistor R60, the emitter of the triode T2 and the ground, and the other end is connected with the DOUT0 end; the anode of the light emitting diode of the optocoupler T3 is connected with 3.3V through resistor R74, the cathode of the light emitting diode is connected with DO1 end, the collector of the photo triode is connected with 5V, the emitter of the photo triode is connected with the base of the triode T4 through resistor R62 and is connected with the ground through resistor R76, the DOUT1 end is connected with the collector of the triode T4, one end of the capacitor C103 is connected with the resistor R76, the emitter of the triode T4 and the ground, and the other end is connected with the DOUT1 end; the anode of the light emitting diode of the optocoupler T5 is connected with DI_COM end through resistor R78, the cathode of the light emitting diode is connected with the resistor R78 through capacitor C100, the collector of the photo triode is connected with 3.3V through resistor R65 as DI0 end, the emitter of the photo triode is connected with the ground, the anode of the light emitting diode of the optocoupler T6 is connected with the DI_COM end through resistor R73, the cathode of the light emitting diode is connected with the resistor R73 through capacitor C101, the collector of the photo triode is connected with 3.3V through resistor R69 as DI1 end, the emitter of the photo triode is connected with the ground, and 5V power supply, the anode and the cathode of the diode D4, resistor R79 and R73 are connected in sequence.

[0012] Preferably, the Internet of Things man-machine interface development board further comprises an external IO expansion circuit module, which is electrically connected with the master control module, the external IO expansion circuit module comprises an expansion chip U11, resistors R18 to R25, a capacitor C91 and a capacitor C92, the VCC pin of the expansion chip U11 is connected with 3.3V and is connected with the ground through the capacitor C91 and the capacitor C92 in parallel; the SDA pin and the SCL pin of the expansion chip U11 are electrically connected with the corresponding SDA pin and SCL pin of the master control module respectively; the IO0 to IO5 pins of the expansion chip U11 are connected with EXIO0 to EXIO5 expansion output ends through resistor R23, resistor R22, resistor R21, resistor R20, resistor R18 and resistor R19 respectively.

[0013] Preferably, the Internet of Things man-machine interface development board further comprises a power supply circuit module, the power supply circuit module is electrically connected with the master control module and the display touch integrated module; the power supply circuit module comprises a first voltage conversion circuit and a second voltage conversion circuit; the first voltage conversion circuit comprises a voltage conversion chip U1 and an inductor L3, an IN pin of the voltage conversion chip U1 is electrically connected with an input power supply, a voltage range of the input power supply is 7-36V, a LX pin of the voltage conversion chip U1 is electrically connected with one end of the inductor L3, the other end of the inductor L3 is electrically connected with a 5V output end, two ends of a capacitor C7 are respectively connected with BS and LX pins of the voltage conversion chip U1, an FB pin of the voltage conversion chip U1 is grounded through a resistor R17 and connected with the 5V output end through a resistor R10; the second voltage conversion circuit comprises a voltage conversion chip U8, capacitors C82-C85, an IN pin of the voltage conversion chip U8 is connected with the 5V output end, an OUT pin is connected with a 3.3V output end, and a G pin is grounded; one end of the capacitor C82 and one end of the capacitor C83 are respectively electrically connected with the IN pin of the voltage conversion chip U8, and the other ends are grounded; one end of the capacitor C84 and one end of the capacitor C85 are respectively electrically connected with the OUT pin of the voltage conversion chip U8, and the other ends are grounded.

[0014] Preferably, the Internet of Things man-machine interface development board further comprises an RTC circuit module, the RTC circuit module is electrically connected with the master control module, and the RTC circuit module comprises an RTC chip U3, a crystal oscillator Y1 and a battery holder; a VDD pin of the RTC chip U3 is connected with a 3.3V power supply and grounded through a capacitor C93; an OSCI pin and an OSCO pin of the RTC chip U3 are respectively electrically connected with two ends of the crystal oscillator Y1, and the OSCI pin and the OSCO pin are respectively grounded through a capacitor C95 and a capacitor C96; a BAT pin of the RTC chip U3 is electrically connected with a positive electrode of the battery holder BAT1, the BAT pin is grounded through a capacitor C94, and a negative electrode of the battery holder BAT1 is grounded; an SDA pin and an SCL pin of the RTC chip U3 are respectively electrically connected with an SDA pin and an SCL pin of the master control module.

[0015] Compared with the prior art, the Internet of Things man-machine interface development board has the following beneficial effects:

[0016] 1. The utility model embodiment provides a kind of Internet of Things man-machine interface development board, and Internet of Things man-machine interface development board includes the main control module and display touch integration module of electric connection, and display touch integration module includes display screen and the touch chip being set on display screen, the communication interface of touch chip is electrically connected with the touch signal input end of main control module, and the display signal output end of main control module is electrically connected with the display signal input end of display screen.Integrated main control module and display touch integration module due to Internet of Things man-machine interface development board, fundamentally solve the problem of low integration caused by traditional development board display and touch separation, and the poor synchronization of display and touch.The communication interface of touch chip will real-time touch signal be transmitted to the touch signal input end of main control module, while main control module is directly transmitted display signal to display screen after processing by display signal output end, and touch signal and display signal are realized centralized processing in main control module.Compared with traditional separate design, without external touch control module and independent circuit, the overall integration of Internet of Things man-machine interface development board is significantly improved;Display signal and touch signal are directly connected with the signal processing path of main control module, avoid transmission delay and synchronization deviation caused by separation path, improve the synchronization of touch operation and display feedback, also facilitate developer to quickly build accurate and efficient man-machine interface, shorten development cycle.

[0017] 2, the utility model embodiment provides touch signal adopts I2C (Inter Integrated Circuit, integrated circuit bus) communication interface, by SDA (Serial Data, serial data) and SCL (Serial Clock, serial clock) double line transmission, less IO pin number of main control module is occupied, simplify circuit connection while reducing signal interference risk;Display screen is directly connected with the corresponding IO pin of main control module by PCLK pixel clock pin, HSYNC line synchronization pin, VSYNC field synchronization pin, can accurately control the timing output of display signal;On the one hand, avoid the structural redundancy of traditional separate circuit, reduce signal transmission loss, on the other hand, the low power consumption and high reliability of I2C communication interface are combined with the timing control of PCLK pixel clock pin, HSYNC line synchronization pin, VSYNC field synchronization pin, so that the transmission rate, timing rhythm of touch signal and display signal are matched, further solve signal delay problem, especially suitable for the Internet of Things scene that display smoothness and touch sensitivity are required higher.

[0018] 3. The storage module and the processor with at least dual cores provided in the embodiment of the utility model, provide sufficient storage and computing power support for display touch interaction, make up the defects of insufficient computing power and data storage relying on external equipment of traditional development board. The processor with at least dual cores can realize parallel task processing, for example, at least one core focuses on receiving and analyzing touch signals transmitted by touch chip, and at least another core synchronously processes display data, avoids task congestion caused by single-core processing, and improves response speed. The flash memory chip can store static data such as interface program for a long time, and the PSRAM chip temporarily stores dynamic content data such as display frame data, without relying on external storage devices for data reading and writing, thereby improving the integration of the Internet of Things human-computer interface development board, and through computing power allocation and data localization storage, reducing the data external transmission link, further reducing signal processing delay, and ensuring the smoothness of touch operation and display feedback.

[0019] 4. The industrial interface module and the main control module are electrically connected in the embodiment of the utility model; the industrial interface module includes at least one of a CAN (Controller Area Network, Controller Area Network) drive circuit module, an RS485 communication interface module, an isolation IO circuit module and a memory card drive circuit module, which expands the Internet of Things application scene of the Internet of Things human-computer interface development board, and avoids the circuit complexity and signal loss problem caused by the additional external industrial interface of the traditional development board. The industrial interface module is directly electrically connected with the main control module, and can realize direct data interaction between the main control module and the industrial equipment. This integrated design not only improves the scene adaptability of the Internet of Things human-computer interface development board, but also shortens the transmission path of industrial data and display touch signals, avoids signal attenuation and synchronization deviation caused by external interface, and improves the stability of the whole system. The CAN drive circuit module realizes differential signal transmission between the main control module and other devices in the CAN bus network through a CAN drive chip, which is helpful for realizing long-distance communication; the RS485 communication interface module is based on the principle of differential signal transmission and supports long-distance and high anti-interference serial communication; the isolation IO circuit module can realize electrical isolation between the main control module and external interference, avoiding damage to the core circuit caused by external voltage impact or noise; the memory card drive circuit module can solve the problem of limited built-in storage capacity of traditional development boards, facilitating data offline recording and tracing.

[0020] 5、The utility model embodiment provides through setting up CAN drive circuit module, solves traditional external CAN module is easy to be interfered with industrial environment, signal transmission unstable problem. CAN drive chip U12 will the CANRX (reception) of main control module, CANTX (send) signal conversion meets the differential signal of CAN bus standard, passes through CANH, CANL bus transmission, two parallel bidirectional voltage stabilizing diode D14 connects CANH, CANL pin and ground respectively, can restrain the transient high voltage in bus, avoid excessively high voltage damage CAN drive chip U12 and main control module. The integrated CAN circuit design of this, need not additional external CAN module, simplifies the hardware structure, the protection function of voltage stabilizing diode and the signal conversion capacity of drive chip are combined simultaneously, ensure that CAN bus data is stably transmitted in complex industrial environment, make industrial equipment data can accurately, real -time transmission into main control module and show through display screen, touch instruction can also be reliably transmitted to industrial equipment, improve the interactive reliability of internet of things industrial scene.

[0021] 6、The utility model embodiment provides RS485 communication interface module's transceiver chip U7 of the main control module UART (Universal Asynchronous Receiver / Transmitter, general asynchronous receiver / transmitter) signal and RS485 differential signal conversion can be realized, RE pin and DE pin short -circuit after through resistance R66 pull -up, ensure that the chip default is in the receiving state, avoid signal conflict, bidirectional voltage stabilizing diode D13 is connected with A pin, bidirectional voltage stabilizing diode D11 is connected with B pin, bidirectional voltage stabilizing diode D12 is connected with bidirectional voltage stabilizing diode D11 and bidirectional voltage stabilizing diode D13, can absorb the interference and transient voltage of RS485 bus, capacitor C63 is used for filtering power supply noise, resistance R64 pull -up RO pin ensures that signal is stable when idle. This design makes the anti -interference ability of RS485 communication improve significantly, can support long -distance data transmission, and need not external RS485 module, reduce signal transmission link. When be used for internet of things remote monitoring scene, data can be stably transmitted into main control module and real -time display through RS485, and user touch instruction can also be accurate feedback to remote equipment, avoid the display data error or touch instruction invalid due to interference.

[0022] 7、The utility model embodiment isolates IO circuit module among the optical coupling chip of electrical isolation of main control module and external equipment, cooperation triode, resistance, capacitance element completes main control weak signal to strong drive output, and external signal to main control identification signal's bidirectional isolation conversion. When DO0 end output low level, the 3.3V power supply of optical coupling T1 input side, resistance R57, optical coupling T1 emitting diode anode, emitting diode cathode and DO0 end conduction, emitting diode light emitting, make photosensitive triode conduction under light, 5V power supply through the photosensitive triode collector and emitter output current of conduction, make triode T2 conduction, DOUT0 end and ground form a path, triode T2's current amplification effect can amplify the weak current of optical coupling T1 at this time, IO output current can reach the industrial grade demand, can directly drive relay, indicator light and other load, enhance the stability and reliability under the industrial environment. When DO0 end output high level, optical coupling T1 input side cut off, make triode T2 cut off, load power off stop. Similarly, when DO1 end output low level, optical coupling T3 realizes optical coupling isolation, triode T4 conduction, DOUT1 end and ground form a path, triode T4's current amplification effect can amplify the weak current of optical coupling T3 at this time, when DO1 end output high level, optical coupling T3 input side cut off, make triode T4 cut off, load power off stop. Similarly, when input external signal, optical coupling T5 realizes optical coupling isolation, emitting diode light emitting, photosensitive triode conduction under light, 3.3V power supply through R65 and the photosensitive triode of conduction directly ground, main control module identifies as external signal effective. Similarly, when input external signal, optical coupling T6 realizes optical coupling isolation, emitting diode light emitting, photosensitive triode conduction under light, 3.3V power supply through R69 and the photosensitive triode of conduction directly ground, main control module identifies as external signal effective. Diode D4 is unidirectional conduction element, and its conduction direction is consistent with the output direction of 5V power supply, can play reverse voltage protection, avoid damaging 5V power supply. The circuit structure of isolation IO circuit module can satisfy the IO interaction demand of high reliability in industrial internet of things scene.

[0023] 8. The external IO expansion circuit module provided in the embodiment of the utility model, solve the problem of traditional development board host module IO pin shortage, improve the development board expandability. The expansion chip U11 of external IO expansion circuit module is connected with the I2C interface of host module through SDA and SCL pin, only occupies 2 IO pins can be extended multiple extension output, resistance R18 to R25 play the current limiting protection function, capacitor C91, C92 are used for filtering power supply noise, ensure that the expansion chip U11 works stably. The above setting does not need to connect IO expansion module, simplify the circuit while avoiding the signal delay caused by external expansion;The extended IO end can be connected with sensor, indicator light and other loads, and the host module can control the extension IO pin through the I2C communication interface efficiently, and does not affect its processing efficiency of display touch signal;The data collected by the extension IO pin can be transmitted into the host module in real time, and after the touch signal and display signal are processed cooperatively, the data is displayed on the display screen synchronously, and the function richness of the man-machine interface of the Internet of Things is improved.

[0024] 9. The power supply circuit module provided in the embodiment of the utility model, solve the problem of traditional development board depending on external power adapter, because the power supply range is narrow or voltage is unstable, leading to display touch abnormality. In the power supply circuit module, the first voltage conversion circuit is based on the voltage stabilization principle of DC-DC switching power supply, through the closed-loop control of voltage conversion chip U1 and the energy storage of inductor L3, the 7-36V wide range input voltage is stably converted into 5V, the FB pin is feedback adjusted output voltage through resistance voltage division, and the 5V output precision is ensured. The second voltage conversion circuit converts 5V into 3.3V through voltage conversion chip U8, and capacitors C82 to C85 are used for filtering voltage fluctuation, providing stable power supply for host module, touch chip and display screen. The wide input voltage range adapts to various power supply modes of Internet of Things scene, without the need of additional replacement adapter;Stable 3.3V power supply can avoid touch signal disorder and display abnormality caused by voltage fluctuation.

[0025] 10. The RTC circuit module provided in the embodiment of the utility model, solve the problem that traditional development board needs external RTC module to realize time record, cause circuit complex and time signal delay. RTC chip U13 communicates with main control module through SDA and SCL pin, crystal oscillator Y1 provides accurate clock signal, battery holder BAT1 supplies power for RTC chip U13 when the internet of things man-machine interface development board is powered off, ensure that time is not lost. The main control module can read the time data of the RTC chip in real time, which is used for time update of the display interface and timestamp record of touch operation. Thus, without external RTC module, the hardware structure is simplified. The battery holder backup ensures the continuity of time, avoiding the need to recalibrate the time every time the power is turned on. By setting the RTC circuit module on the internet of things man-machine interface development board, the time signal and the display and touch signal are directly coordinated in the main control module, the time data and the display frame are synchronously refreshed, and the touch instruction and the timestamp are synchronously stored, avoiding the time signal transmission delay caused by setting an external RTC module, improving the time accuracy and interaction synchronization of the man-machine interface, and being especially suitable for the internet of things monitoring scene with time record demand. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor intensity.

[0027] Figure 1 It is the circuit block diagram of the display touch integrated module and the main control module of the internet of things man-machine interface development board provided by the first embodiment of the utility model.

[0028] Figure 2 It is the circuit diagram of the main control module interface of the internet of things man-machine interface development board provided by the first embodiment of the utility model.

[0029] Figure 3 It is the circuit diagram of the display screen interface of the internet of things man-machine interface development board provided by the first embodiment of the utility model.

[0030] Figure 4 It is the circuit diagram of the touch chip interface of the internet of things man-machine interface development board provided by the first embodiment of the utility model.

[0031] Figure 5 It is the circuit block diagram of the industrial interface module and the main control module of the internet of things man-machine interface development board provided by the first embodiment of the utility model.

[0032] Figure 6The utility model discloses a circuit diagram of CAN drive circuit module of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0033] Figure 7 The utility model discloses a circuit diagram of RS485 communication interface module of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0034] Figure 8 The utility model discloses a circuit diagram of isolation IO circuit module of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0035] Figure 9 The utility model discloses a circuit diagram of external IO extension circuit module of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0036] Figure 10 The utility model discloses a circuit diagram of first voltage transformation circuit of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0037] Figure 11 The utility model discloses a circuit diagram of second voltage transformation circuit of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0038] Figure 12 The utility model discloses a circuit block diagram of power supply circuit module of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0039] Figure 13 The utility model discloses a circuit diagram of RTC circuit module of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0040] The utility model discloses a circuit diagram of RTC circuit module of the man -machine interface development board of internet of things of first embodiment provided by the utility model.

[0041] 1, the man -machine interface development board of internet of things;10, display touch integration module;11, display screen;12, touch chip;20, main control module;21, touch signal input end;22, display signal output end;30, industrial interface module;31, CAN drive circuit module;32, RS485 communication interface module;33, isolation IO circuit module;34, memory card drive circuit module;40, external IO extension circuit module;50, power supply circuit module;50a, first voltage transformation circuit;50b, second voltage transformation circuit;60, RTC circuit module;111, display signal input end;121, communication interface. DETAILED DESCRIPTION

[0042] In order to make the utility model's purpose, technical scheme and advantage more clearly clear, following combining with the drawing and embodiment, this utility model carries out further detailed explanation. It is understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0043] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right", and similar expressions as used herein are for illustrative purposes only.

[0044] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0045] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0046] In addition, the terms "mounting", "setting", "provided with", "connection", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] Please refer to Figure 1 The first embodiment of the present application provides a kind of Internet of Things man-machine interface development board 1, and Internet of Things man-machine interface development board includes the main control module 20 and display touch integrated module 10 of electric connection, display touch integrated module 10 includes display screen 11 and the touch chip 12 of setting on display screen 11, the communication interface 121 of touch chip 12 is electrically connected with the touch signal input end 21 of main control module 20, the display signal output end 22 of main control module 20 is electrically connected with the display signal input end 111 of display screen 11.

[0048] Understandably, since the Internet of Things man-machine interface development board 1 integrates the main control module 20 and the display touch integrated module 10, it fundamentally solves the problem of low integration caused by the separation of display and touch in traditional development boards, and the poor synchronization of display and touch. The communication interface 121 of the touch chip 12 transmits real-time touch signals to the touch signal input end 21 of the main control module 20, and at the same time, the main control module 20 transmits display signals directly to the display screen 11 through the display signal output end 22 after processing. The touch signal and the display signal are centrally processed in the main control module 20. Compared with the traditional separate design, there is no need to externally connect the touch module and the independent circuit, which significantly improves the overall integration of the Internet of Things man-machine interface development board 1; the display signal and the touch signal are directly connected to the signal processing path of the main control module 20, avoiding transmission delay and synchronization deviation caused by separate paths, improving the synchronization of touch operation and display feedback, and facilitating developers to quickly build accurate and efficient human-computer interaction interfaces and shorten the development cycle.

[0049] Optionally, the main control module 20 can adopt an ESP32-S3 dual-core LX7 processor. When the main control module 20 obtains the touch signal, the main control module 20 runs a graphics library program, which is an LVGL (Light and Versatile Graphics Library) open source graphics library or a custom GUI program based on the architecture thereof. The ESP32-S3 processes touch events through the LVGL or custom GUI program to realize synchronous response of touch and display.

[0050] Optionally, the display screen 11 can be a 4.3-inch, 5-inch, 7-inch, or 10.1-inch display screen 11.

[0051] Please refer to Figures 2 to 4 Further, the communication interface 121 is an I2C communication interface; the signal output end of the touch chip 12 is electrically connected to the touch signal input end 21 of the main control module 20, the signal output end of the I2C communication interface includes an SDA pin and an SCL pin, and the SDA pin and the SCL pin are respectively electrically connected to the corresponding IO pin of the main control module 20; the display signal input end of the display screen 11 includes a PCLK pixel clock pin, an HSYNC row synchronization pin, and a VSYNC field synchronization pin, and the PCLK pixel clock pin, the HSYNC row synchronization pin, and the VSYNC field synchronization pin are respectively electrically connected to the corresponding IO pin of the main control module 20.

[0052] It can be understood that the touch signal adopts an I2C (Inter Integrated Circuit) communication interface, is transmitted through SDA (Serial Data) and SCL (Serial Clock) double lines, occupies fewer IO pins of the main control module 20, simplifies circuit connection, and reduces the risk of signal interference; the display screen 11 is directly connected with corresponding IO pins of the main control module 20 through a PCLK (Pixel Clock) pixel clock pin, an HSYNC (Horizontal Sync) row synchronization pin, and a VSYNC (Vertical Sync) field synchronization pin, so that the timing output of the display signal can be accurately controlled; on the one hand, the structural redundancy of the traditional separate line is avoided, and the signal transmission loss is reduced, and on the other hand, the low power consumption and high reliability of the I2C communication interface are combined with the timing control of the PCLK pixel clock pin, the HSYNC row synchronization pin, and the VSYNC field synchronization pin, so that the transmission rate and timing rhythm of the touch signal and the display signal are matched, the signal delay problem is further solved, and the Internet of Things scene with high requirements for display fluency and touch sensitivity is especially suitable.

[0053] It should be noted that the PCLK pixel clock pin, the HSYNC row synchronization pin, and the VSYNC field synchronization pin are key synchronization signal pins when image data of the display screen 11 is transmitted. Among them, the PCLK is a pixel clock signal, which is used to control the transmission timing of single pixel data, and ensures that each pixel data is accurately sampled; the HSYNC is a row synchronization signal, which indicates the start and end of a row of pixel data, and realizes the alignment of row-level data; the VSYNC is a field synchronization signal, which marks the start and end of a complete image, and guarantees the complete transmission of the whole image, and through the clear timing logic, the image data is transmitted in the correct row-column order and frame structure to ensure the image display and collection quality.

[0054] Further, the Internet of Things human-computer interface development board 1 further includes a storage module, the storage module is electrically connected with the main control module 20, the storage module includes a Flash storage chip and a PSRAM chip, and the main control module 20 includes a processor with at least double cores.

[0055] It can be understood that the storage module and the processor with at least dual cores provide sufficient storage and computing power support for display touch interaction, making up for the defects of insufficient computing power and data storage relying on external devices of traditional development boards. The processor with at least dual cores can realize parallel task processing, for example, at least one core focuses on receiving and analyzing touch signals transmitted by the touch chip, and at least another core synchronously processes display data, avoiding task congestion caused by single-core processing and improving response speed. The flash storage chip is a non-volatile memory device that can store static data such as interface programs for a long time, and the PSRAM (Pseudo Static Random Access Memory) chip is a volatile memory device used for temporarily storing dynamic content data such as display frame data, without relying on external storage devices for data reading and writing, thereby improving the integration of the Internet of Things human-computer interface development board 1, and through computing power allocation and data localization storage, reducing the data external transmission link, further reducing signal processing delay, and ensuring the smoothness of touch operation and display feedback.

[0056] Optionally, the flash storage chip, the PSRAM chip and the processor are detachably arranged on the Internet of Things human-computer interface development board 1, so as to replace different specifications according to specific needs and improve applicability.

[0057] Optionally, the storage module adopts 16MB flash and 8MB PSRAM.

[0058] Please refer to Figure 5 Further, the Internet of Things human-computer interface development board 1 further comprises an industrial interface module 30, the industrial interface module 30 being electrically connected with the main control module 20; the industrial interface module 30 comprises at least one of a CAN drive circuit module 31, an RS485 communication interface module 32, an isolation IO circuit module 33 and a memory card drive circuit module 34.

[0059] It can be understood that Figure 5The industrial interface module 30 includes the CAN drive circuit module 31, the RS485 communication interface module 32, the isolation IO circuit module 33 and the memory card drive circuit module 34. The industrial interface module 30 is electrically connected with the main control module 20; the industrial interface module 30 includes at least one of the CAN (Controller Area Network) drive circuit module 31, the RS485 communication interface module 32, the isolation IO circuit module 33 and the memory card drive circuit module 34, which expands the Internet of Things application scenarios of the Internet of Things man-machine interface development board 1, and avoids the circuit complexity and signal loss caused by the additional external industrial interface of the traditional development board. The industrial interface module 30 is directly electrically connected with the main control module 20, and can realize direct data interaction between the main control module 20 and the industrial equipment. This integrated design not only improves the scene adaptability of the Internet of Things man-machine interface development board 1, but also shortens the transmission path of industrial data and display touch signals, avoids signal attenuation and synchronization deviation caused by external interfaces, and improves the stability of the overall system. The CAN drive circuit module 31 realizes differential signal transmission between the main control module 20 and other devices in the CAN bus network through a CAN drive chip, which helps to realize long-distance communication; the RS485 communication interface module 32 supports long-distance and high anti-interference serial communication based on the principle of differential signal transmission; the isolation IO circuit module 33 can realize electrical isolation between the main control module 20 and external interference, avoiding damage to the core circuit caused by external voltage impact or noise; and the memory card drive circuit module 34 can solve the problem of limited built-in storage capacity of the traditional development board, facilitating offline data recording and tracing.

[0060] Please refer to Figure 5 and Figure 6 , further, the industrial interface module 30 includes the CAN drive circuit module 31, the CAN drive circuit module 31 includes the CAN drive chip U12, the CANH bus, the CANL bus and two parallel bidirectional voltage stabilizing diodes D14, the RXD pin and the TXD pin of the CAN drive chip U12 are connected with the CANRX pin and the CANTX pin of the main control module 20 respectively, the CANH pin and the CANL pin of the CAN drive chip U12 are connected with the CANH bus and the CANL bus respectively, the CANH pin and the CANL pin are connected with one end of the two bidirectional voltage stabilizing diodes D14 respectively, and the other end of the two bidirectional voltage stabilizing diodes D14 is grounded.

[0061] It can be understood that by setting the CAN drive circuit module 31, the problem of traditional external CAN module being easily disturbed by industrial environment and unstable signal transmission is solved. The CAN drive chip U12 converts the CANRX (receive) and CANTX (transmit) signals of the main control module 20 into differential signals conforming to the CAN bus standard, which are transmitted through the CANH (CAN High) and CANL (CAN Low) buses. CANH and CANL are the core differential signal lines of the CAN bus physical layer, and data transmission is achieved through voltage difference. Two parallel bidirectional stabilizing diodes D14 are connected to the CANH and CANL pins and grounded, which can suppress transient high voltage in the bus and prevent high voltage from damaging the CAN drive chip U12 and the main control module 20. This integrated CAN circuit design does not require additional external CAN module, simplifying the hardware structure. At the same time, the protection of the stabilizing diode and the signal conversion capability of the drive chip are combined to ensure stable transmission of CAN bus data in complex industrial environment, so that the industrial equipment data can be accurately and real-time transmitted into the main control module 20 and displayed through the display screen 11, and the touch instruction can also be reliably transmitted to the industrial equipment, improving the interactive reliability of the Internet of Things industrial scene.

[0062] Please refer to Figure 5 and Figure 7 , further, the industrial interface module 30 includes an RS485 communication interface module 32, the RS485 communication interface module 32 includes a transceiver chip U7, a triode S1, bidirectional stabilizing diodes D11 to D13; the VCC pin of the transceiver chip U7 is connected to 5V and grounded through the capacitor C63; the RO pin is connected to 3.3V through the resistor R64, and the RO pin is connected to the UART_TX pin of the main control module 20 as the RS485 RXD end; the RE pin and the DE pin of the transceiver chip U7 are shorted and connected to 3.3V through the resistor R66; the A pin of the transceiver chip U7 is connected to the A1 end of the RS485 interface, and the A pin is grounded through the bidirectional stabilizing diode D13; the B pin of the transceiver chip U7 is grounded through the bidirectional stabilizing diode D11, and the B pin is connected to the B1 end of the RS485 interface; the bidirectional stabilizing diode D12 is connected between the bidirectional stabilizing diodes D11 and D13.

[0063] It can be understood that RS485 is an industrial serial communication standard applied in industrial control and other fields. It forms a differential pair through two signal lines A and B to realize differential signal transmission, effectively suppress noise, and adapt to complex electromagnetic environment scenarios. The transceiver chip U7 of the RS485 communication interface module 32 realizes the conversion of the UART (Universal Asynchronous Receiver / Transmitter) signal of the main control module 20 and the RS485 differential signal. After the RE pin and the DE pin are short-circuited and pulled up through the resistor R66, it is ensured that the chip is in the receiving state by default, avoiding signal conflicts. The bidirectional voltage stabilizing diode D13 is connected to the A pin, the bidirectional voltage stabilizing diode D11 is connected to the B pin, and the bidirectional voltage stabilizing diode D12 is connected across the bidirectional voltage stabilizing diode D11 and the bidirectional voltage stabilizing diode D13, which can absorb the interference and transient voltage of the RS485 bus. The capacitor C63 is used to filter power supply noise, and the resistor R64 pulls up the RO pin to ensure signal stability when idle. This design significantly improves the anti-interference ability of RS485 communication, supports long-distance data transmission, and does not require external RS485 modules, reducing signal transmission links. When used in Internet of Things remote monitoring scenarios, data can be stably transmitted to the main control module 20 and displayed in real time, and user touch instructions can also be accurately fed back to remote devices, avoiding display data errors or touch instruction failures caused by interference.

[0064] Please combine Figure 5 and Figure 8Further, the industrial interface module 30 comprises an isolated IO circuit module 33 electrically connected with the main control module 20, the isolated IO circuit module 33 comprising optocouplers T1, T3, T5, T6, transistors T2, T4 and diode D4; the anode of the light-emitting diode of the optocoupler T1 is connected with 3.3V through resistor R57, the cathode of the light-emitting diode is connected with DO0 terminal, the collector of the photoelectric triode is connected with 5V, the emitter of the photoelectric triode is connected with the base of the transistor T2 through resistor R58 and with the ground through resistor R60, the DOUT0 terminal is connected with the collector of the transistor T2, one end of the capacitor C102 is connected with resistor R60, the emitter of the transistor T2 and the ground, and the other end is connected with the DOUT0 terminal; the anode of the light-emitting diode of the optocoupler T3 is connected with 3.3V through resistor R74, the cathode of the light-emitting diode is connected with DO1 terminal, the collector of the photoelectric triode is connected with 5V, the emitter of the photoelectric triode is connected with the base of the transistor T4 through resistor R62 and with the ground through resistor R76, the DOUT1 terminal is connected with the collector of the transistor T4, one end of the capacitor C103 is connected with resistor R76, the emitter of the transistor T4 and the ground, and the other end is connected with the DOUT1 terminal; the anode of the light-emitting diode of the optocoupler T5 is connected with DI_COM terminal through resistor R78, the cathode of the light-emitting diode is connected with resistor R78 through capacitor C100, the collector of the photoelectric triode as DI0 terminal is connected with 3.3V through resistor R65, the emitter of the photoelectric triode is connected with the ground, the anode of the light-emitting diode of the optocoupler T6 is connected with DI_COM terminal through resistor R73, the cathode of the light-emitting diode is connected with resistor R73 through capacitor C101, the collector of the photoelectric triode as DI1 terminal is connected with 3.3V through resistor R69, the emitter of the photoelectric triode is connected with the ground, and 5V power supply, positive and negative poles of diode D4, resistors R79 and R73 are connected in sequence.

[0065] It can be understood that the optocoupler chip in the isolation IO circuit module 33 realizes the electrical isolation of the master control module 20 and the external device, and cooperates with the transistor, resistor, capacitor and other elements to complete the master weak signal to strong drive output and the bidirectional isolation conversion of the external signal to the master recognition signal. When the DO0 end outputs low level, the 3.3V power supply at the input side of the optocoupler T1, the resistor R57, the anode of the light-emitting diode of the optocoupler T1, the cathode of the light-emitting diode and the DO0 end are turned on, the light-emitting diode emits light, the photosensitive transistor is turned on under light, the 5V power supply is output through the turned-on collector and emitter of the photosensitive transistor, the transistor T2 is turned on, and the DOUT0 end forms a path with the ground. At this time, the current amplification effect of the transistor T2 can amplify the weak current of the optocoupler T1, so that the IO output current can meet the industrial level requirement, and can directly drive the relay, indicator light and other loads, thereby enhancing the stability and reliability in the industrial environment. When the DO0 end outputs high level, the input side of the optocoupler T1 is cut off, so that the transistor T2 is cut off, and the load is powered off and stopped. Similarly, when the DO1 end outputs low level, the optocoupler T3 realizes optocoupler isolation, the transistor T4 is turned on, and the DOUT1 end forms a path with the ground. At this time, the current amplification effect of the transistor T4 can amplify the weak current of the optocoupler T3. When the DO1 end outputs high level, the input side of the optocoupler T3 is cut off, so that the transistor T4 is cut off, and the load is powered off and stopped. Similarly, when the external signal is input, the optocoupler T5 realizes optocoupler isolation, the light-emitting diode emits light, the photosensitive transistor is turned on under light, the 3.3V power supply is directly grounded through R65 and the turned-on photosensitive transistor, and the master control module 20 recognizes that the external signal is valid. Similarly, when the external signal is input, the optocoupler T6 realizes optocoupler isolation, the light-emitting diode emits light, the photosensitive transistor is turned on under light, the 3.3V power supply is directly grounded through R69 and the turned-on photosensitive transistor, and the master control module 20 recognizes that the external signal is valid. The diode D4 is a unidirectional conduction element, and its conduction direction is consistent with the output direction of the 5V power supply, which can play a reverse voltage protection role to avoid damaging the 5V power supply. The circuit structure of the isolation IO circuit module 33 can meet the high reliability IO interaction requirement in the industrial Internet of Things scene.

[0066] Optionally, the IO output current is less than or equal to 450mA, which ensures reliable operation in the industrial environment and protects the master control module 20.

[0067] Please refer to Figure 9Further, the Internet of Things man-machine interface development board 1 further comprises an external IO expansion circuit module 40, the external IO expansion circuit module 40 is electrically connected with the main control module 20, the external IO expansion circuit module 40 comprises an expansion chip U11, resistors R18 to R25, a capacitor C91 and a capacitor C92, the VCC pin of the expansion chip U11 is connected with 3.3V and grounded through the capacitor C91 and the capacitor C92 in parallel; the SDA pin and the SCL pin of the expansion chip U11 are electrically connected with the corresponding SDA pin and SCL pin of the main control module 20 respectively; the IO0 to IO5 pins of the expansion chip U11 are respectively connected with the EXIO0 to EXIO5 expansion output ends through the resistors R23, R22, R21, R20, R18 and R19.

[0068] It can be understood that the external IO expansion circuit module 40 solves the problem of insufficient IO pins of the main control module 20 of the traditional development board and improves the expandability of the development board. The expansion chip U11 of the external IO expansion circuit module 40 is connected with the I2C interface of the main control module 20 through the SDA and SCL pins, and only 2 IO pins are occupied to expand multiple expansion output ends, the resistors R18 to R25 play a current limiting protection role, and the capacitors C91 and C92 are used to filter power supply noise to ensure stable work of the expansion chip U11. The above setting does not need to externally connect the IO expansion module, which simplifies the circuit and avoids signal delay caused by external expansion; the expanded IO end can be connected with a sensor, an indicator light and other loads, and the main control module 20 can efficiently control the expanded IO pin through the I2C communication interface without affecting the processing efficiency of the display touch signal; the data collected by the expanded IO pin can be transmitted into the main control module 20 in real time, and after being processed cooperatively with the touch signal and the display signal, it is displayed synchronously on the display screen 11, which improves the functional richness of the Internet of Things man-machine interface.

[0069] Please refer to Figures 10 to 12, further, the internet of things man-machine interface development board 1 further includes a power supply circuit module 50, the power supply circuit module 50 is electrically connected with the master module 20 and the display touch integration module 10;The power supply circuit module 50 includes first voltage conversion circuit 50a and second voltage conversion circuit 50b;The first voltage conversion circuit 50a includes voltage conversion chip U1, inductance L3, the IN pin of voltage conversion chip U1 is electrically connected with input power supply, the voltage range of input power supply is 7-36V, the LX pin of voltage conversion chip U1 is electrically connected with one end of inductance L3, the other end of inductance L3 is electrically connected with 5V output end, the two ends of capacitor C7 are connected with the BS pin and LX pin of voltage conversion chip U1 respectively, the FB pin of voltage conversion chip U1 is grounded through resistance R17, and is connected with 5V output end through resistance R10;The second voltage conversion circuit 50b includes voltage conversion chip U8, capacitor C82 to capacitor C85, the IN pin of voltage conversion chip U8 is connected with 5V output end, the OUT pin is connected with 3.3V output end, and the G pin is grounded;One end of capacitor C82 and capacitor C83 is electrically connected with the IN pin of voltage conversion chip U8 respectively, and the other end is grounded;One end of capacitor C84 and capacitor C85 is electrically connected with the OUT pin of voltage conversion chip U8 respectively, and the other end is grounded.

[0070] It can be understood that the power supply circuit module 50 solves the problem that the traditional development board relies on external power adapter and causes display touch abnormality due to narrow power supply range or unstable voltage. In the power supply circuit module 50, the first voltage conversion circuit 50a is based on the voltage stabilization principle of DC-DC switching power supply, and through the closed-loop control of voltage conversion chip U1 and the energy storage of inductance L3, the 7-36V wide range input voltage is stably converted into 5V, the FB pin is feedback adjusted by resistance to ensure the 5V output precision. The second voltage conversion circuit 50b linearly converts 5V to 3.3V through voltage conversion chip U8, and capacitor C82 to C85 is used for filtering voltage fluctuation to provide stable power supply for the master module 20, touch chip 12, display screen 11 and the like. The wide input voltage range adapts to various power supply modes of internet of things scene, without the need of additional adapter replacement;Stable 3.3V power supply can avoid touch signal disorder and display abnormality caused by voltage fluctuation.

[0071] Please refer to Figure 13Further, the Internet of Things man-machine interface development board 1 further comprises an RTC circuit module 60, the RTC circuit module 60 is electrically connected with the main control module 20, the RTC circuit module 60 comprises an RTC chip U3, a crystal oscillator Y1 and a battery holder, the VDD pin of the RTC chip U3 is connected with a 3.3V power supply, and is grounded through a capacitor C93; the OSCI pin and the OSCO pin of the RTC chip U3 are electrically connected with two ends of the crystal oscillator Y1 respectively, and the OSCI pin and the OSCO pin are grounded through a capacitor C95 and a capacitor C96 respectively; the BAT pin of the RTC chip U3 is electrically connected with the positive pole of the battery holder BAT1, the BAT pin is grounded through a capacitor C94, and the negative pole of the battery holder BAT1 is grounded; the SDA pin and the SCL pin of the RTC chip U3 are electrically connected with the SDA pin and the SCL pin of the main control module 20 respectively.

[0072] Understandably, the RTC (Real Time Clock, real-time clock) is a special timer device specially used for accurately tracking, recording and outputting time and date, and can still work continuously after power failure. The RTC circuit module 60 solves the problem that the traditional development board needs to be externally connected with an RTC module to realize time recording, resulting in complex circuit and time signal delay. The RTC chip U13 communicates with the main control module 20 through the SDA and SCL pins, the crystal oscillator Y1 provides accurate clock signals, and the battery holder BAT1 supplies power to the RTC chip U13 when the Internet of Things man-machine interface development board is powered off, ensuring that the time is not lost. The main control module 20 can read the time data of the RTC chip in real time, which is used for time updating of the display interface and time stamp recording of touch operation. Thus, without externally connecting the RTC module, the hardware structure is simplified. The battery holder backup ensures the continuity of time and avoids the need to recalibrate the time every time the power is turned on. By setting the RTC circuit module 60 on the Internet of Things man-machine interface development board 1, the time signal is directly coordinated with the display and touch signal in the main control module 20, the time data is synchronously refreshed with the display frame, and the touch instruction is synchronously stored with the time stamp, avoiding the time signal transmission delay caused by setting an external RTC module, improving the time accuracy and interaction synchronization of the man-machine interface, and being especially suitable for the Internet of Things monitoring scene with time recording requirements.

[0073] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the principle of the present application shall be included in the protection scope of the present application.

Claims

1. An Internet of Things human-machine interface development board, characterized in that: The Internet of Things man-machine interface development board comprises a main control module and a display touch integrated module which are electrically connected, the display touch integrated module comprises a display screen and a touch chip arranged on the display screen, a communication interface of the touch chip is electrically connected with a touch signal input end of the main control module, and a display signal output end of the main control module is electrically connected with a display signal input end of the display screen.

2. The IoT human interface development board of claim 1, wherein: The communication interface is an I2C communication interface; a signal output end of the touch chip is electrically connected with a touch signal input end of the main control module, a signal output end of the I2C communication interface comprises an SDA pin and an SCL pin, and the SDA pin and the SCL pin are respectively electrically connected with corresponding IO pins of the main control module; a display signal input end of the display screen comprises a PCLK pixel clock pin, an HSYNC row synchronization pin and a VSYNC field synchronization pin, and the PCLK pixel clock pin, the HSYNC row synchronization pin and the VSYNC field synchronization pin are respectively electrically connected with corresponding IO pins of the main control module.

3. The IoT human interface development board of claim 1, wherein: The Internet of Things man-machine interface development board further comprises a storage module, the storage module is electrically connected with the main control module, the storage module comprises a Flash storage chip and a PSRAM chip, and the main control module comprises a processor with at least dual cores.

4. The IoT human interface development board of claim 1, wherein: The Internet of Things man-machine interface development board further comprises an industrial interface module, the industrial interface module is electrically connected with the main control module; and the industrial interface module comprises at least one of a CAN drive circuit module, an RS485 communication interface module, an isolation IO circuit module and a memory card drive circuit module.

5. The IoT human interface development board of claim 4, wherein: The industrial interface module comprises the CAN drive circuit module, the CAN drive circuit module comprises a CAN drive chip U12, a CANH bus, a CANL bus and two parallel bidirectional voltage stabilizing diodes D14, an RXD pin and a TXD pin of the CAN drive chip U12 are connected with a CANRX pin and a CANTX pin of the main control module respectively, a CANH pin and a CANL pin of the CAN drive chip U12 are connected with the CANH bus and the CANL bus respectively, the CANH pin and the CANL pin are connected with one end of the two bidirectional voltage stabilizing diodes D14 respectively, and the other end of the two bidirectional voltage stabilizing diodes D14 is grounded.

6. The IoT human interface development board of claim 4, wherein: The industrial interface module includes the RS485 communication interface module, the RS485 communication interface module includes transceiver chip U7, triode S1, bidirectional voltage stabilizing diode D11 to D13;The VCC pin of the transceiver chip U7 is connected with 5V and grounded through capacitor C63;The RO pin is connected with 3.3V through resistor R64, and the RO pin is connected with the UART_TX pin of the master control module as RS485 RXD end;The RE pin and DE pin of the transceiver chip U7 are short-circuited and connected with 3.3V through resistor R66;The A pin of the transceiver chip U7 is connected with the A1 end of RS485 interface, and the A pin is grounded through the bidirectional voltage stabilizing diode D13;The B pin of the transceiver chip U7 is grounded through the bidirectional voltage stabilizing diode D11, and the B pin is connected with the B1 end of RS485 interface;The bidirectional voltage stabilizing diode D12 is connected with the bidirectional voltage stabilizing diode D11 and D13 respectively.

7. The IoT human interface development board of claim 4, wherein: The industrial interface module includes the isolation IO circuit module, the isolation IO circuit module is electrically connected with the master control module, the isolation IO circuit module includes photoelectric coupler T1, T3, T5, T6, triode T2, T4 and diode D4;The anode of the light-emitting diode of the photoelectric coupler T1 is connected with 3.3V through resistor R57, the cathode of the light-emitting diode is connected with DO0 end, the collector of the photoelectric triode is connected with 5V, the emitter of the photoelectric triode is connected with the base of the triode T2 through resistor R58 and is grounded through resistor R60, the DOUT0 end is connected with the collector of the triode T2, one end of capacitor C102 is connected with the resistor R60, the emitter of the triode T2 and the ground, and the other end is connected with the DOUT0 end;The anode of the light-emitting diode of the photoelectric coupler T3 is connected with 3.3V through resistor R74, the cathode of the light-emitting diode is connected with DO1 end, the collector of the photoelectric triode is connected with 5V, the emitter of the photoelectric triode is connected with the base of the triode T4 through resistor R62 and is grounded through resistor R76, the DOUT1 end is connected with the collector of the triode T4, one end of capacitor C103 is connected with the resistor R76, the emitter of the triode T4 and the ground, and the other end is connected with the DOUT1 end;The anode of the light-emitting diode of the photoelectric coupler T5 is connected with DI_COM end through resistor R78, the cathode of the light-emitting diode is connected with the resistor R78 through capacitor C100, the collector of the photoelectric triode is connected with 3.3V as DI0 end through resistor R65, the emitter of the photoelectric triode is grounded, the anode of the light-emitting diode of the photoelectric coupler T6 is connected with the DI_COM end through resistor R73, the cathode of the light-emitting diode is connected with the resistor R73 through capacitor C101, the collector of the photoelectric triode is connected with 3.3V as DI1 end through resistor R69, the emitter of the photoelectric triode is grounded, 5V power supply, the anode and cathode of the diode D4, resistor R79 and R73 are connected in sequence.

8. The IoT human interface development board of claim 1, wherein: The Internet of Things man-machine interface development board further comprises an external IO expansion circuit module, the external IO expansion circuit module is electrically connected with the master control module, the external IO expansion circuit module comprises an expansion chip U11, resistors R18 to R25, a capacitor C91 and a capacitor C92, a VCC pin of the expansion chip U11 is connected with 3.3V and grounded through the capacitor C91 and the capacitor C92 in parallel; an SDA pin and an SCL pin of the expansion chip U11 are electrically connected with corresponding SDA pin and SCL pin of the master control module respectively; IO0 to IO5 pins of the expansion chip U11 are connected with EXIO0 to EXIO5 expansion output ends through resistors R23, R22, R21, R20, R18 and R19 respectively.

9. The IoT human interface development board of claim 1, wherein: The Internet of Things man-machine interface development board further comprises a power supply circuit module, the power supply circuit module is electrically connected with the master control module and the display touch integrated module; the power supply circuit module comprises a first voltage conversion circuit and a second voltage conversion circuit; the first voltage conversion circuit comprises a voltage conversion chip U1 and an inductor L3, an IN pin of the voltage conversion chip U1 is electrically connected with an input power supply, a voltage range of the input power supply is 7 to 36V, a LX pin of the voltage conversion chip U1 is electrically connected with one end of the inductor L3, the other end of the inductor L3 is electrically connected with a 5V output end, two ends of a capacitor C7 are connected with BS and LX pins of the voltage conversion chip U1 respectively, a FB pin of the voltage conversion chip U1 is grounded through a resistor R17 and connected with the 5V output end through a resistor R10; the second voltage conversion circuit comprises a voltage conversion chip U8 and capacitors C82 to C85, an IN pin of the voltage conversion chip U8 is connected with the 5V output end, an OUT pin is connected with a 3.3V output end, and a G pin is grounded; one end of the capacitor C82 and one end of the capacitor C83 are electrically connected with the IN pin of the voltage conversion chip U8 respectively, and the other ends are grounded; one end of the capacitor C84 and one end of the capacitor C85 are electrically connected with the OUT pin of the voltage conversion chip U8 respectively, and the other ends are grounded.

10. The IoT human interface development board of claim 1, wherein: The Internet of Things man-machine interface development board further comprises an RTC circuit module, the RTC circuit module is electrically connected with the master control module, the RTC circuit module comprises an RTC chip U3, a crystal oscillator Y1 and a battery holder, a VDD pin of the RTC chip U3 is connected with a 3.3V power supply and grounded through a capacitor C93; an OSCI pin and an OSCO pin of the RTC chip U3 are electrically connected with two ends of the crystal oscillator Y1 respectively, and the OSCI pin and the OSCO pin are grounded through a capacitor C95 and a capacitor C96 respectively; a BAT pin of the RTC chip U3 is electrically connected with a positive electrode of the battery holder BAT1, the BAT pin is grounded through a capacitor C94, and a negative electrode of the battery holder BAT1 is grounded; an SDA pin and an SCL pin of the RTC chip U3 are electrically connected with an SDA pin and an SCL pin of the master control module respectively.

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