A portable wireless communication demonstration device

Abstract

The utility model relates to the field of internet of things technology, more particularly to a portable wireless communication demonstration equipment, include: core processing module, power module, sensor interface module, controllable equipment module, wireless communication interface module and man -machine interface module, power module electric connection is to core processing module, sensor interface module, controllable equipment module, wireless communication interface module and man -machine interface module, sensor interface module electric connection is to core processing module, controllable equipment module electric connection is to core processing module, wireless communication interface module electric connection is to core processing module, man -machine interface module electric connection is to core processing module. The utility model discloses through the modularization design, has realized to the compatible comparison of multiple wireless technology and the simulation demonstration of real application scene, and has the high flexibility and practical value.

Description

Technical Field

[0001] This utility model relates to the field of Internet of Things (IoT) technology, and more specifically, to a portable wireless communication demonstration device. Background Technology

[0002] With the rapid development of Internet of Things (IoT) technology, wireless communication technologies based on different standards such as WiFi, Bluetooth, LoRa, and Zigbee are increasingly widely used across various industries. To select technologies, verify functions, and evaluate performance of different wireless solutions in the early stages of project development, the industry typically needs specialized communication demonstration equipment. The core function of this equipment is to build a basic wireless data link, which usually consists of a main controller, a wireless communication module, a human-machine interface, and a power supply unit. During the demonstration, the device processes and forwards data through the main controller, completes air transmission through the wireless communication module, and finally presents the communication results on the receiving end or display device. This provides developers and users with an intuitive platform to demonstrate wireless connectivity, helping them understand the basic working principles and data transmission capabilities of specific wireless technologies. Currently, existing communication demonstration equipment generally has certain limitations. On the one hand, its hardware structure is relatively fixed, usually designed only for a single type of wireless communication technology. This means that when comparing the advantages and disadvantages of multiple wireless solutions (such as LoRa and WiFi), multiple independent devices must be prepared, lacking compatibility and cross-functional evaluation capabilities. On the other hand, their functions are relatively limited, mostly confined to basic data transmission and reception verification, failing to integrate with peripheral controllable devices such as relays and solenoid valves to simulate real industrial control or data acquisition application scenarios. This not only limits the applicability of the equipment in multi-technology selection and comparative evaluation scenarios, but also, due to the lack of integration with specific application scenarios, makes it difficult to intuitively demonstrate the comprehensive effectiveness and value of wireless technology in actual deployment. Utility Model Content

[0003] The purpose of this utility model is to provide a portable wireless communication demonstration device, which, through modular design, achieves compatibility and comparison of multiple wireless technologies and simulates demonstrations of real application scenarios, combining high flexibility and practical value.

[0004] The embodiments of this utility model are achieved through the following technical solutions: A portable wireless communication demonstration device includes: a core processing module, a power supply module, a sensor interface module, a controllable device module, a wireless communication interface module, and a human-computer interaction module; the power supply module is electrically connected to the core processing module, the sensor interface module, the controllable device module, the wireless communication interface module, and the human-computer interaction module; the sensor interface module is electrically connected to the core processing module; the controllable device module is electrically connected to the core processing module; the wireless communication interface module is electrically connected to the core processing module; and the human-computer interaction module is electrically connected to the core processing module.

[0005] Optionally, the power module includes a first power circuit and a second power circuit; The first power supply circuit includes: a first chip, a main power switch, a first fuse, a first transient voltage suppression diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first inductor, a first electrolytic capacitor, a sixth capacitor, a seventh capacitor, and a second transient voltage suppression diode; The power input terminal is electrically connected to one end of the main power switch, and the other end of the main power switch is connected to one end of the first fuse. The other end of the first fuse forms a main input node, which is electrically connected to: one end of the first transient voltage suppression diode, one end of each of the first, second and third capacitors, one end of the first resistor and one end of the second resistor; The other end of the first resistor is electrically connected to the enable pin of the first chip; the other end of the second resistor is electrically connected to the power input pin of the first chip. The frequency setting pin of the first chip is grounded via the third resistor; The fourth capacitor is connected between the bootstrap pin and the switch pin of the first chip; The switching pin of the first chip is connected to one end of the first inductor, and the other end of the first inductor forms the first output node; The first output node is electrically connected to one end of the first electrolytic capacitor, one end of each of the sixth and seventh capacitors, and one end of the second transient voltage suppression diode. The fourth resistor and the fifth resistor are connected in series, and the whole is connected between the first output node and ground. The series connection node is connected to the feedback pin of the first chip; the fifth capacitor is connected in parallel with the fourth resistor. The second power supply circuit includes: a second chip and eighth, ninth, tenth and eleventh capacitors; The first output node of the first power supply circuit is electrically connected to the power input pin and the enable pin of the second chip. The output pins of the second chip form a second output node, which is electrically connected to one end of each of the eighth, ninth, tenth, and eleventh capacitors. Among them, the other ends of the first transient voltage suppression diode, the first capacitor, the second capacitor, the third capacitor, the first electrolytic capacitor, the sixth capacitor, the seventh capacitor, the second transient voltage suppression diode, the eighth capacitor, the ninth capacitor, the tenth capacitor, and the eleventh capacitor are all grounded together.

[0006] Optionally, the human-computer interaction module includes: a serial port screen circuit, wherein the serial port screen circuit includes a first interface connector; The VCC pin of the first interface connector is connected to the first power supply node; The TXD pin of the first interface connector is connected to the first data transmission line for sending data to the core processing module; The RXD pin of the first interface connector is connected to the first data receiving line for receiving data from the core processing module; The GND pin of the first interface connector is grounded.

[0007] Optionally, the controllable device module includes a relay circuit, which includes a first relay, a first transistor, a first freewheeling diode, a first base resistor, a first base capacitor, and a first output connector. The coil of the first relay is connected at one end to the second power supply node and at the other end to the collector of the first transistor. The first freewheeling diode is connected in parallel across the coil of the first relay, and its negative terminal is connected to the second power supply node; The control signal input terminal is connected to the base of the first transistor via the first base resistor; The first base capacitor is connected between the base of the first transistor and ground; The common terminal, normally open terminal, and normally closed terminal of the first relay are respectively connected to the corresponding pins of the first output connector; The emitter of the first transistor is grounded.

[0008] Optionally, the controllable device module includes a solenoid valve drive circuit, which includes: a first metal-oxide-semiconductor field-effect transistor, a second transistor, a second freewheeling diode, a second output connector, multiple resistors, and a first light-emitting diode; One end of the second output connector is connected to the third power supply node, and the other end is connected to the drain of the first metal-oxide-semiconductor field-effect transistor; The second freewheeling diode is connected in parallel across the two ends of the second output connector, and its negative terminal is connected to the third power supply node; The control signal input terminal is connected to the base of the second transistor via the second base resistor; The first light-emitting diode has its anode connected to the fourth power supply node via a current-limiting resistor, and its cathode electrically connected to the base of the second transistor; The collector of the second transistor is connected to the fifth power supply node via a pull-up resistor and to the gate of the first metal-oxide-semiconductor field-effect transistor via a gate resistor. The gate of the first metal-oxide-semiconductor field-effect transistor is further grounded via a gate pull-down resistor; In this configuration, the emitter of the second transistor and the source of the first metal-oxide-semiconductor field-effect transistor are both grounded.

[0009] Optionally, the sensor interface module includes an RS232 communication circuit, which includes a first RS232 transceiver chip, a pair of first ferrite beads, a pair of third transient voltage suppression diodes, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, and a sixteenth capacitor. The VCC pin of the first RS232 transceiver chip is connected to the sixth power supply node, the GND pin of the first RS232 transceiver chip is grounded, the T1in pin of the first RS232 transceiver chip is connected to the receiving end of the core processing module, and the R1out pin of the first RS232 transceiver chip is connected to the serial transmitting end of the core processing module. The T1out pin and R1in pin of the first RS232 transceiver chip are grounded via the first ferrite bead and the third transient voltage suppression diode, respectively. The twelfth capacitor is connected between the C1+ and C1- pins of the first RS232 transceiver chip; The thirteenth capacitor is connected between the C2+ and C2- pins of the first RS232 transceiver chip; The fourteenth capacitor is connected between the V+ pin of the first RS232 transceiver chip and ground; The fifteenth capacitor is connected between the V-pin of the first RS232 transceiver chip and ground; The sixteenth capacitor is connected in parallel between the sixth power supply node and ground.

[0010] Optionally, the sensor interface module further includes an RS485 communication circuit, which includes: a first RS485 transceiver chip, a twelfth resistor, a thirteenth resistor, a seventeenth capacitor, an eighteenth capacitor, a second ferrite bead, a third ferrite bead, a first resettable fuse, a second resettable fuse, a fourth transient voltage suppression diode, a fifth transient voltage suppression diode, and a sixth transient voltage suppression diode. The VCC pin of the first RS485 transceiver chip is connected to the seventh power supply node, and the GND and EPAD pins of the first RS485 transceiver chip are both grounded. The DI pin of the first RS485 transceiver chip is connected to the data output terminal of the core processing module, the DE pin and RE pin of the first RS485 transceiver chip are respectively connected to the enable control terminal of the core processing module, and the RO pin of the first RS485 transceiver chip is connected to the data input terminal of the core processing module. The A pin of the first RS485 transceiver chip is connected to one end of the twelfth resistor and one end of the second ferrite bead, respectively. The twelfth resistor is used as a pull-up resistor, and its other end is connected to the seventh power supply node. The other end of the second ferrite bead is connected to the first bus node. The B pin of the first RS485 transceiver chip is connected to one end of the thirteenth resistor and one end of the third ferrite bead, respectively. The thirteenth resistor is used as a pull-down resistor, and its other end is grounded. The other end of the third ferrite bead is connected to the second bus node. One end of the first resettable fuse is connected to line A of the external RS485 bus, and the other end is connected to the first bus node; one end of the second resettable fuse is connected to line B of the external RS485 bus, and the other end is connected to the second bus node. The fourth transient voltage suppression diode is connected in parallel between the first bus node and ground; The fifth transient voltage suppression diode is connected in parallel between the second bus node and ground; The sixth transient voltage suppression diode is connected in parallel between the first bus node and the second bus node.

[0011] Optionally, the wireless communication interface module includes: a second interface connector, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, and an array of multiple electrostatic protection diodes; The multiple data pins of the second interface connector are respectively connected to the corresponding pins of the core processing module; The power supply pin of the second interface connector is connected to the eighth power supply node and is connected in parallel with one end of the nineteenth, twentieth, twenty-first and twenty-second capacitors; Multiple electrostatic discharge protection diode arrays are respectively connected in parallel between some data pins of the second interface connector and ground; The grounding pin of the second interface connector, the other end of the nineteenth, twentieth, twenty-first and twenty-second capacitors, and the grounding terminal of the multiple electrostatic protection diode arrays are all grounded together.

[0012] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects: On the one hand, this invention, through its modular sensor and wireless communication interface design, can quickly adapt to and replace different types of sensors and wireless communication modules, achieving compatibility and comparative demonstration of multiple technologies on the same hardware platform, effectively improving the system's versatility and scalability. On the other hand, it incorporates multiple controllable devices such as relays and solenoid valves, and combined with a serial port display, it can not only simulate application scenarios such as industrial irrigation and lighting control, but also realize visualized monitoring of equipment status, greatly enhancing the intuitiveness, flexibility, and practical value of the demonstration. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overall structure of the portable wireless communication demonstration device provided by this utility model; Figure 2 A circuit diagram of the power supply module provided by this utility model; Figure 3 A schematic diagram of the RS485 communication circuit provided by this utility model; Figure 4 This is a schematic diagram of the RS232 communication circuit provided by this utility model; Figure 5 A schematic diagram of the relay circuit provided by this utility model; Figure 6 A schematic diagram of the solenoid valve drive circuit provided by this utility model; Figure 7 A circuit diagram of the wireless communication interface module provided by this utility model; Figure 8 A schematic diagram of the serial port screen circuit provided by this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] like Figure 1 As shown, this utility model provides a portable wireless communication demonstration device. This device aims to solve the problems of existing demonstration devices having limited functionality, poor compatibility, and inability to simulate real-world application scenarios. Through a highly integrated and modular structural design, it provides a comprehensive demonstration platform that integrates comparisons of multiple wireless technologies, access to multiple types of sensors, and simulation of real-world industrial scenarios.

[0016] In one specific embodiment, the portable wireless communication demonstration device structurally comprises six core, mutually cooperating components: a core processing module, a power supply module, a sensor interface module, a controllable device module, a wireless communication interface module, and a human-computer interaction module.

[0017] Specifically, the core processing module is the central nervous system of the entire device, and its physical carrier can be a microcontroller (MCU), digital signal processor (DSP), or embedded system-on-a-chip (SoC). It is responsible for executing the preset firmware program and coordinating and managing all other modules of the device. Its functions include: receiving and processing user commands from the human-machine interface module; driving actuators such as relays and solenoid valves in the controllable device modules according to user commands; communicating with external sensors through the sensor interface module to collect environmental parameters; exchanging wireless data with a remote control terminal or other devices through the wireless communication interface module; and sending device status, sensor data, and other information to the human-machine interface module for display.

[0018] The power module is the energy supply center of the entire device, responsible for converting externally input power into stable DC voltages of various specifications required by the internal modules. Through wires or power buses on the circuit board, it provides continuous and reliable power to the core processing module, sensor interface module, controllable device module, wireless communication interface module, and human-machine interface module.

[0019] The sensor interface module serves as a bridge for devices to interact with the external world. It provides various standardized physical interface circuits for connecting different types of sensors. This module receives raw signals from the sensors, performs necessary level conversion and protocol processing, and then delivers them to the core processing module.

[0020] The controllable device module is a key component for realizing physical world output and control of the equipment. It integrates a series of drive circuits for controlling external actuators such as relays, solenoid valves, motors, and indicator lights. The core processing module can drive these high-power external devices by sending low-power control signals to this module, thereby simulating real industrial control processes.

[0021] The wireless communication interface module is the core of the device's wireless data transmission function. It provides one or more standardized hardware interfaces, allowing users to flexibly plug in and replace wireless communication modules with different communication protocols (such as LoRa, WiFi, Bluetooth, Zigbee, etc.) according to demonstration needs.

[0022] The human-machine interface module is the interface through which users interact with the device locally. It typically consists of a graphical display screen (such as a serial port screen) used to display the device's operating status, sensor data, network connectivity, etc. in real time, and to receive touch input commands from the user, enabling local visual monitoring and operation of the device.

[0023] In the above structure, all modules are electrically connected and interact with each other around the core processing module. The power supply module supplies power to all other modules; the sensor interface module, controllable device module, wireless communication interface module, and human-machine interaction module are all connected to the corresponding pins of the core processing module through data lines, control lines, etc., forming a complete and collaborative organic whole.

[0024] like Figure 2 As shown, in a preferred embodiment, the power module is designed to provide high-quality, multi-specification power supply, and its internal structure includes a first power supply circuit and a second power supply circuit. This embodiment employs a multi-stage voltage regulation scheme of DC-DC converter plus LDO (low dropout linear regulator). The aim is to first perform the main voltage conversion through a high-efficiency switching power supply (DC-DC), and then perform fine voltage regulation and filtering through a linear regulator (LDO). This ensures efficiency while achieving lower output ripple and better load regulation capability, providing a clean power supply for sensitive analog circuits and digital chips.

[0025] The core function of the first power supply circuit is to efficiently convert a wide-voltage input (e.g., 12V) to the system's main operating voltage (e.g., 5V). This circuit specifically includes: a first chip (a DC-DC buck converter controller), a main power switch, a first fuse, a first transient voltage suppressor diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first inductor, a first electrolytic capacitor, a sixth capacitor, a seventh capacitor, and a second transient voltage suppressor diode. The input stage of the circuit consists of a power input terminal, a main power switch, a first fuse, and an input protection / filtering circuit. The external DC power supply is first connected to one end of the main power switch, allowing the user to control the power supply to and from the device. The other end of the main power switch is connected in series with the first fuse, which acts as an overcurrent protection element, rapidly blowing in the event of a short circuit or abnormally high current in the downstream circuit, protecting the entire device from damage. The other end of the fuse forms a main input node. At this node, the first transient voltage suppressor diode and the first, second, and third capacitors are connected in parallel. The first transient voltage suppressor diode absorbs surge voltage and electrostatic discharge from the power line, protecting the subsequent circuitry. The first, second, and third capacitors (typically a combination of ceramic capacitors with different capacitance values) form the input filter network, filtering out high-frequency noise from the power line and providing instantaneous current to the DC-DC chip. The main input node is also connected to one end of the first and second resistors. The other end of the first resistor is connected to the enable pin (EN) of the first chip, and the other end of the second resistor is connected to the power input pin (VIN) of the first chip. This connection method, especially through a resistor divider network (possibly in conjunction with a grounding resistor, not detailed here), enables undervoltage lockout (UVLO), ensuring that the chip only starts operating when the input voltage reaches a preset threshold. The first chip is the core of this circuit. Its frequency setting pin is grounded through the third resistor, the value of which determines the operating switching frequency of the DC-DC converter. Choosing an appropriate frequency allows for a balance between efficiency, component size, and electromagnetic interference (EMI). A fourth capacitor is connected between the chip's bootstrap pin (BOOT) and switch pin (SW). This bootstrap capacitor, along with the internal diode, forms a bootstrap circuit that provides a floating voltage higher than the input voltage to the internal high-side MOSFET driver during the switching cycle, ensuring the high-side MOSFET can be fully turned on. The chip's switch pin is a critical node for energy transfer, connected to one end of the first inductor. The first inductor is the main energy storage element of the buck converter, storing energy when the switch is on and releasing energy to the load when the switch is off. The other end of the first inductor forms the first output node, i.e., the output voltage of this stage of the circuit (e.g., 5V). Output filtering and protection circuitry is connected to the first output node. The first electrolytic capacitor, the sixth capacitor, and the seventh capacitor together form the output filtering network.The first electrolytic capacitor provides a large bulk capacitance to stabilize the output voltage and suppress low-frequency ripple; the sixth and seventh ceramic capacitors are used to filter out high-frequency noise. A second transient voltage suppression diode is connected in parallel at the output terminal to prevent the output terminal from being subjected to external static electricity or surge impacts.

[0026] To achieve precise voltage control, the voltage of the first output node is sampled through a feedback network. This network consists of a fourth and a fifth resistor connected in series, bridging the first output node and ground. The series junction of these two resistors is connected to the feedback pin (FB) of the first chip. An internal error amplifier compares this feedback voltage with a precise internal reference voltage. By adjusting the duty cycle (PWM) of the switching transistor, the voltage at the feedback pin is kept stable at the reference voltage value, thus ensuring a constant voltage at the first output node. The fifth capacitor, connected in parallel with the fourth resistor, is a feedforward capacitor used to improve the transient response performance of the loop.

[0027] The second power supply circuit provides a lower, cleaner voltage (e.g., 3.3V) based on the output of the first power supply circuit, specifically for powering noise-sensitive core processing modules, sensors, or wireless modules. This circuit structure is relatively simple, mainly consisting of a second chip (an LDO linear regulator) and eighth, ninth, tenth, and eleventh capacitors. The first output node of the first power supply circuit (e.g., 5V) is directly used as the input of the second power supply circuit, electrically connected to the power input pin and enable pin of the second chip. Connecting the enable pin directly to the input means that the LDO chip is always operational as long as there is an input voltage. The output pin of the second chip forms the second output node (e.g., 3.3V). The eighth, ninth, tenth, and eleventh capacitors (usually combinations of different values) are connected in parallel between the second output node and ground as output capacitors, which stabilize the output voltage, suppress noise, and improve the transient response of the load. The LDO dissipates excess voltage drop through its internal regulating transistor, providing an extremely stable and low-noise output in a linear manner.

[0028] like Figure 8As shown, in a specific embodiment, the core of the human-machine interaction module is a serial port screen circuit. The physical interface of this circuit is a first interface connector. This connector contains at least four key pins: VCC, GND, TXD (transmit data), and RXD (receive data). The VCC pin is connected to a stable first power supply node (e.g., 5V or 3.3V provided by the power supply module) to provide operating power to the serial port screen. The GND pin is connected to the device ground. The TXD pin is connected to a first data transmission line, which ultimately connects to a serial receive pin (e.g., UART_RX) of the core processing module, used to send instruction data generated by user operations (e.g., button presses, swipes) on the serial port screen to the core processing module. The RXD pin is connected to a first data receive line, which ultimately connects to a serial transmit pin (e.g., UART_TX) of the core processing module, used by the core processing module to send the data to be displayed (e.g., sensor readings, device status) to the serial port screen for rendering and presentation. Through this bidirectional serial communication, the core processing module and the serial port screen achieve data interaction and collaborative control, thus forming a complete local visual monitoring system.

[0029] like Figure 5 As shown, furthermore, to simulate diverse industrial application scenarios, this embodiment integrates multiple drive circuits into the controllable device module. In one embodiment, the module includes a relay circuit. This circuit is used to control the switching on and off of a high-voltage load via a low-voltage signal. It includes a first relay, a first transistor (such as an NPN transistor), a first freewheeling diode, a first base resistor, a first base capacitor, and a first output connector. One end of the coil of the first relay is connected to a suitable second power supply node (e.g., 12V), and the other end is connected to the collector of the first transistor. The emitter of the first transistor is grounded, and its base is connected to a control signal input terminal from the core processing module through the first base resistor. When the control signal is high, current flows into the base through the first base resistor, causing the first transistor to saturate and conduct, and its collector is pulled to a potential close to ground, thereby forming a sufficiently large voltage difference across the coil, driving the relay to engage. When the control signal is low, the transistor is off, the current in the coil disappears, and the relay is released. The first freewheeling diode is connected in reverse parallel across the coil (negative terminal connected to the positive power supply terminal). This provides a freewheeling path for the self-induced electromotive force generated in the coil during the instant the transistor is cut off and the coil current changes abruptly, thus protecting the first transistor from high-voltage surges. The first base capacitor is connected in parallel between the base and ground to filter out glitches and interference on the control signal line, preventing relay malfunction. The mechanical contacts of the first relay, including a common terminal, normally open terminal, and normally closed terminal, are led out to the first output connector for easy connection of external loads, such as lamps or motors.

[0030] like Figure 6As shown, in another embodiment, the module further includes a solenoid valve drive circuit. This circuit is designed specifically for driving inductive loads such as solenoid valves and typically requires a larger drive current than a relay. It includes: a first metal-oxide-semiconductor field-effect transistor (MOSFET, such as an N-channel enhancement-mode transistor), a second transistor (such as an NPN transistor), a second freewheeling diode, a second output connector, multiple resistors, and a first light-emitting diode. The second output connector is used to connect an external solenoid valve, with one end connected to a higher-power third power supply node (such as 12V) and the other end connected to the drain of the first MOSFET. The second freewheeling diode is also connected in reverse parallel across the second output connector for surge protection. This circuit employs a two-stage drive structure: the control signal input from the core processing module is connected to the base of the second transistor via a second base resistor. The emitter of the second transistor is grounded, and its collector is connected via a pull-up resistor to a fifth power supply node (which can be 5V or 12V) that powers the MOSFET gate drive, and simultaneously connected to the gate of the first MOSFET via a gate resistor. When the control signal is high, the second transistor is turned on, its collector is pulled low, which in turn pulls the gate potential of the first MOSFET to ground, causing the MOSFET to turn off and the solenoid valve to lose power. When the control signal is low, the second transistor is turned off. At this time, the fifth power supply node charges the gate of the first MOSFET through the pull-up resistor and the gate resistor, turning it on and energizing the solenoid valve. The source of the first MOSFET is grounded. Its gate is also grounded through a gate pull-down resistor to ensure that the MOSFET can reliably be in the off state when the control signal is uncertain or floating. The first light-emitting diode is connected in series with a current-limiting resistor, its anode is connected to the fourth power supply node, and its cathode is connected to the base of the second transistor, serving as a status indicator: when the control signal is high, the LED lights up, indicating that the drive circuit is operating.

[0031] like Figure 4As shown, the sensor interface module provides the device with rich wired communication capabilities to adapt to sensors with different interfaces. In one embodiment, the module includes an RS232 communication circuit. This circuit is used to enable communication with devices that have RS232 interfaces (such as some older industrial control equipment or debugging terminals). It mainly includes: a first RS232 transceiver chip, a pair of first ferrite beads, a pair of third transient voltage suppression diodes, and multiple capacitors (twelfth to sixteenth capacitors). The first RS232 transceiver chip is the core, integrating a charge pump circuit and a level converter. Its VCC pin is connected to the sixth power supply node (e.g., 5V) to obtain operating power, and the GND pin is grounded. On the TTL / CMOS level side of the chip, the T1in pin (transmit data input) is connected to the serial transmitter of the core processing module, and the R1out pin (receive data output) is connected to the serial receiver of the core processing module. On the RS232 level side of the chip, the T1out pin (RS232 transmit output) and the R1in pin (RS232 receive input) are ports for connecting to external devices. These two ports are connected in series with the first ferrite bead to suppress high-frequency electromagnetic interference, and connected to ground with the third transient voltage suppression diode to provide electrostatic discharge (ESD) protection. The chip's charge pump section requires several external capacitors to operate: the twelfth capacitor is connected between the C1+ and C1- pins, and the thirteenth capacitor is connected between the C2+ and C2- pins; these, in conjunction with internal switches, generate the positive and negative voltages (such as +10V and -10V) required for the RS232 protocol. The fourteenth capacitor is connected between the V+ pin and ground, and the fifteenth capacitor is connected between the V- pin and ground, serving as energy storage and filtering capacitors for the positive and negative power supplies generated by the charge pump. The sixteenth capacitor is connected in parallel between the chip's VCC power supply pin and ground to provide decoupling filtering for the chip itself.

[0032] like Figure 3As shown, in another embodiment, the module also includes an RS485 communication circuit for supporting long-distance, multi-node differential communication widely used in industrial applications. This circuit is meticulously designed with robust protection features. It includes: a first RS485 transceiver chip, first and second resettable fuses, fourth to sixth transient voltage suppression diodes, second and third ferrite beads, twelfth and thirteenth resistors, and a seventeenth capacitor. The signal path from the outside into the circuit undergoes multiple levels of protection and conditioning. The A and B lines of the external RS485 bus are connected in series with the first and second resettable fuses, respectively. When a sustained overcurrent (such as a short circuit) occurs on the bus, these two components will exhibit a high-resistance state due to heat generation, thereby cutting off the current. They automatically recover after the fault is cleared, providing reliable overcurrent protection. The rear ends of the fuses form the first and second bus nodes, respectively. A robust surge and electrostatic discharge protection network is constructed at these two nodes. The fourth transient voltage suppressor diode is connected in parallel between the first bus node (line A) and ground, and the fifth transient voltage suppressor diode is connected in parallel between the second bus node (line B) and ground. They are used to absorb common-mode surges. The sixth transient voltage suppressor diode is connected across the first and second bus nodes to absorb differential-mode surges. These three TVS diodes together form a complete triple protection system. After protection, the signal lines are connected in series with the second and third ferrite beads to filter out high-frequency common-mode noise and enhance the signal's anti-interference capability. The rear end of the ferrite beads is connected to the differential pins A and B of the first RS485 transceiver chip. This chip is the core of the circuit; its VCC pin is connected to the seventh power supply node, and GND and the heat sink EPAD are both grounded. On the logic side of the chip, the DI (data input) pin is connected to the data output terminal of the core processing module, the RO (data output) pin is connected to the data input terminal of the core processing module, and the DE (drive enable) and RE (receive enable) pins are usually connected in parallel to a GPIO pin of the core processing module to control whether the chip is in transmit or receive mode. To ensure a consistent voltage level on the bus during idle states and prevent receiver misinterpretation, a fail-safe bias resistor is included in the circuit. The twelfth resistor acts as a pull-up resistor, connected between pin A of the chip and the seventh power supply node. The thirteenth resistor acts as a pull-down resistor, connected between pin B of the chip and ground. These two resistors work together to create a small positive voltage gap between lines A and B when the bus is not driven by any device, ensuring the bus remains in a stable logic "1" state. The seventeenth capacitor is connected in parallel between the chip's VCC pin and ground.

[0033] like Figure 7As shown, in this embodiment, to achieve maximum flexibility and scalability, the wireless communication interface module is designed as a universal adapter interface. It includes a second interface connector, capacitors nineteen to twenty-second, and multiple arrays of electrostatic discharge (ESD) protection diodes. The second interface connector is a multi-pin socket or header whose pin definitions cover the interface signals required by various mainstream wireless modules, such as SPI (MISO, MOSI, SCK, CS), UART (TX, RX), and other control / interrupt pins. These data pins are directly connected to the corresponding functional pins of the core processing module via circuit board wiring. The connector's power supply pins are connected to a stable eighth power supply node and are connected in parallel with one end of capacitors nineteen, twentieth, twenty-first, and twenty-second. These capacitors are placed close to the connector to provide sufficient local power decoupling and filtering for the wireless module to be installed, ensuring stable operation. To protect the core processing module from ESD damage caused by module insertion / removal or antenna contact, multiple arrays of ESD protection diodes are connected in parallel between certain sensitive data pins of the second interface connector and ground. The module's ground pin, the other ends of all filter capacitors, and the ground terminal of the ESD protection device are all grounded. This design allows users to select and install different types of wireless modules, such as LoRa, WiFi, and Bluetooth, as needed, much like building with blocks, greatly enhancing the device's versatility and demonstration capabilities.

[0034] In summary, this portable wireless communication demonstration device, through its structured modular design, allows users to operate the device via a graphical interface on the human-machine interface module (serial port screen) in local control mode. For example, in the "simulated irrigation" scenario, clicking the "open water valve" button sends the instruction to the core processing module via serial communication. After receiving and parsing the instruction, the core processing module drives the solenoid valve drive circuit in the controllable device module, thereby opening the externally connected solenoid valve. Simultaneously, the core processing module can read data from the soil moisture sensor through the sensor interface module and send the real-time humidity value to the human-machine interface module for display, forming a complete closed-loop demonstration.

[0035] In remote control mode, the accompanying software on the remote PC sends a control command conforming to the Modbus-RTU protocol (e.g., controlling a relay to close in a lighting control scenario) via a USB-to-wireless module. This command is received by the device's wireless communication interface module and passed to the core processing module. The core processing module receives the Modbus command and drives the relay circuit in the controllable device module, causing the relay to engage and illuminating the externally connected light fixture. Subsequently, the core processing module can wirelessly transmit the execution result or power consumption data read from a digital meter (connected via an RS485 interface) back to the remote PC, enabling remote monitoring.

[0036] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A portable wireless communication demonstration device, characterized in that, include: Core processing module, power supply module, sensor interface module, controllable device module, wireless communication interface module, and human-machine interaction module; The power supply module is electrically connected to the core processing module, sensor interface module, controllable device module, wireless communication interface module, and human-machine interaction module. The sensor interface module is electrically connected to the core processing module, the controllable device module is electrically connected to the core processing module, the wireless communication interface module is electrically connected to the core processing module, and the human-machine interaction module is electrically connected to the core processing module.

2. The portable wireless communication demonstration device according to claim 1, characterized in that, The power module includes a first power circuit and a second power circuit. The first power supply circuit includes: a first chip, a main power switch, a first fuse, a first transient voltage suppression diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first inductor, a first electrolytic capacitor, a sixth capacitor, a seventh capacitor, and a second transient voltage suppression diode; The power input terminal is electrically connected to one end of the main power switch, and the other end of the main power switch is connected to one end of the first fuse. The other end of the first fuse forms a main input node, which is electrically connected to: one end of the first transient voltage suppression diode, one end of each of the first, second and third capacitors, one end of the first resistor and one end of the second resistor; The other end of the first resistor is electrically connected to the enable pin of the first chip; the other end of the second resistor is electrically connected to the power input pin of the first chip. The frequency setting pin of the first chip is grounded via the third resistor; The fourth capacitor is connected between the bootstrap pin and the switch pin of the first chip; The switching pin of the first chip is connected to one end of the first inductor, and the other end of the first inductor forms the first output node; The first output node is electrically connected to one end of the first electrolytic capacitor, one end of each of the sixth and seventh capacitors, and one end of the second transient voltage suppression diode. The fourth resistor and the fifth resistor are connected in series, and the whole is connected between the first output node and ground. The series connection node is connected to the feedback pin of the first chip; the fifth capacitor is connected in parallel with the fourth resistor. The second power supply circuit includes: a second chip and eighth, ninth, tenth and eleventh capacitors; The first output node of the first power supply circuit is electrically connected to the power input pin and the enable pin of the second chip. The output pins of the second chip form a second output node, which is electrically connected to one end of each of the eighth, ninth, tenth, and eleventh capacitors. Among them, the other ends of the first transient voltage suppression diode, the first capacitor, the second capacitor, the third capacitor, the first electrolytic capacitor, the sixth capacitor, the seventh capacitor, the second transient voltage suppression diode, the eighth capacitor, the ninth capacitor, the tenth capacitor, and the eleventh capacitor are all grounded together.

3. The portable wireless communication demonstration device according to claim 1, characterized in that, The human-computer interaction module includes a serial port screen circuit, which includes a first interface connector. The VCC pin of the first interface connector is connected to the first power supply node; The TXD pin of the first interface connector is connected to the first data transmission line for sending data to the core processing module; The RXD pin of the first interface connector is connected to the first data receiving line for receiving data from the core processing module; The GND pin of the first interface connector is grounded.

4. The portable wireless communication demonstration device according to claim 1, characterized in that, The controllable device module includes a relay circuit, which includes a first relay, a first transistor, a first freewheeling diode, a first base resistor, a first base capacitor, and a first output connector. The coil of the first relay is connected at one end to the second power supply node and at the other end to the collector of the first transistor. The first freewheeling diode is connected in parallel across the coil of the first relay, and its negative terminal is connected to the second power supply node; The control signal input terminal is connected to the base of the first transistor via the first base resistor; The first base capacitor is connected between the base of the first transistor and ground; The common terminal, normally open terminal, and normally closed terminal of the first relay are respectively connected to the corresponding pins of the first output connector; The emitter of the first transistor is grounded.

5. The portable wireless communication demonstration device according to claim 1, characterized in that, The controllable device module includes a solenoid valve drive circuit, which includes: a first metal-oxide-semiconductor field-effect transistor, a second transistor, a second freewheeling diode, a second output connector, multiple resistors, and a first light-emitting diode; One end of the second output connector is connected to the third power supply node, and the other end is connected to the drain of the first metal-oxide-semiconductor field-effect transistor; The second freewheeling diode is connected in parallel across the two ends of the second output connector, and its negative terminal is connected to the third power supply node; The control signal input terminal is connected to the base of the second transistor via the second base resistor; The first light-emitting diode has its anode connected to the fourth power supply node via a current-limiting resistor, and its cathode electrically connected to the base of the second transistor; The collector of the second transistor is connected to the fifth power supply node via a pull-up resistor and to the gate of the first metal-oxide-semiconductor field-effect transistor via a gate resistor. The gate of the first metal-oxide-semiconductor field-effect transistor is further grounded via a gate pull-down resistor; In this configuration, the emitter of the second transistor and the source of the first metal-oxide-semiconductor field-effect transistor are both grounded.

6. The portable wireless communication demonstration device according to claim 1, characterized in that, The sensor interface module includes an RS232 communication circuit, which includes a first RS232 transceiver chip, a pair of first ferrite beads, a pair of third transient voltage suppression diodes, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, and a sixteenth capacitor. The VCC pin of the first RS232 transceiver chip is connected to the sixth power supply node, the GND pin of the first RS232 transceiver chip is grounded, the T1in pin of the first RS232 transceiver chip is connected to the receiving end of the core processing module, and the R1out pin of the first RS232 transceiver chip is connected to the serial transmitting end of the core processing module. The T1out pin and R1in pin of the first RS232 transceiver chip are grounded via the first ferrite bead and the third transient voltage suppression diode, respectively. The twelfth capacitor is connected between the C1+ and C1- pins of the first RS232 transceiver chip; The thirteenth capacitor is connected between the C2+ and C2- pins of the first RS232 transceiver chip; The fourteenth capacitor is connected between the V+ pin of the first RS232 transceiver chip and ground; The fifteenth capacitor is connected between the V-pin of the first RS232 transceiver chip and ground; The sixteenth capacitor is connected in parallel between the sixth power supply node and ground.

7. The portable wireless communication demonstration device according to claim 1, characterized in that, The sensor interface module also includes an RS485 communication circuit, which includes: a first RS485 transceiver chip, a twelfth resistor, a thirteenth resistor, a seventeenth capacitor, an eighteenth capacitor, a second ferrite bead, a third ferrite bead, a first resettable fuse, a second resettable fuse, a fourth transient voltage suppression diode, a fifth transient voltage suppression diode, and a sixth transient voltage suppression diode. The VCC pin of the first RS485 transceiver chip is connected to the seventh power supply node, and the GND and EPAD pins of the first RS485 transceiver chip are both grounded. The DI pin of the first RS485 transceiver chip is connected to the data output terminal of the core processing module, the DE pin and RE pin of the first RS485 transceiver chip are respectively connected to the enable control terminal of the core processing module, and the RO pin of the first RS485 transceiver chip is connected to the data input terminal of the core processing module. The A pin of the first RS485 transceiver chip is connected to one end of the twelfth resistor and one end of the second ferrite bead, respectively. The twelfth resistor is used as a pull-up resistor, and its other end is connected to the seventh power supply node. The other end of the second ferrite bead is connected to the first bus node. The B pin of the first RS485 transceiver chip is connected to one end of the thirteenth resistor and one end of the third ferrite bead, respectively. The thirteenth resistor is used as a pull-down resistor, and its other end is grounded. The other end of the third ferrite bead is connected to the second bus node. One end of the first resettable fuse is connected to line A of the external RS485 bus, and the other end is connected to the first bus node; one end of the second resettable fuse is connected to line B of the external RS485 bus, and the other end is connected to the second bus node. The fourth transient voltage suppression diode is connected in parallel between the first bus node and ground; The fifth transient voltage suppression diode is connected in parallel between the second bus node and ground; The sixth transient voltage suppression diode is connected in parallel between the first bus node and the second bus node.

8. The portable wireless communication demonstration device according to claim 1, characterized in that, The wireless communication interface module includes: a second interface connector, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, and an array of multiple electrostatic protection diodes; The multiple data pins of the second interface connector are respectively connected to the corresponding pins of the core processing module; The power supply pin of the second interface connector is connected to the eighth power supply node and is connected in parallel with one end of the nineteenth, twentieth, twenty-first and twenty-second capacitors; Multiple electrostatic discharge protection diode arrays are respectively connected in parallel between some data pins of the second interface connector and ground; The grounding pin of the second interface connector, the other end of the nineteenth, twentieth, twenty-first and twenty-second capacitors, and the grounding terminal of the multiple electrostatic protection diode arrays are all grounded together.

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