Internet of things temperature and humidity monitoring terminal

Abstract

The utility model discloses an internet of things temperature and humidity monitoring terminal, including shell, LCD and integrated circuit board, install LCD and integrated circuit board in the shell, be provided with several gas holes that communicate inside and outside the shell in the position of temperature and humidity response element's opposite and adjacent in the shell on the shell, and LCD is half -and -half type LCD, still install the back light source for making LCD display content under the dark environment in the shell, and integrated circuit board includes microcontrol unit and the power supply circuit, temperature signal acquisition circuit, humidity signal acquisition circuit, LCD drive circuit, back light source control circuit, back light source switch and clear configuration button circuit that are connected with microcontrol unit, and microcontrol unit has integrated wi the -Fi module. The utility model has solved the temperature and humidity data of the present temperature and humidity table display's table outside environment not enough accurate, under the dark environment, its LCD does not show, is inconvenient to check, does not have the networking function, can not remote monitoring target environment's temperature and humidity problem.

Description

Technical Field

[0001] This utility model relates to the field of temperature and humidity monitoring device technology, and in particular to an Internet of Things (IoT) temperature and humidity monitoring terminal. Background Technology

[0002] Existing temperature and humidity meters do not display accurate temperature and humidity data of the external environment; their LCD screens do not display in dark environments, making them inconvenient to view; and they do not have network connectivity, so they cannot remotely monitor the temperature and humidity of the target environment. Utility Model Content

[0003] To address the problems of existing temperature and humidity meters that do not display accurate temperature and humidity data of the external environment, whose LCD screens do not display in dark environments, making them inconvenient to view, and which lack network connectivity and cannot remotely monitor the temperature and humidity of the target environment, this utility model provides an Internet of Things (IoT) temperature and humidity monitoring terminal.

[0004] The technical solution adopted in this utility model is as follows: An IoT temperature and humidity monitoring terminal includes a housing, an LCD screen, and an integrated circuit board. The housing includes a front shell and a rear shell. The front of the front shell has an LCD screen viewing window. The LCD screen and the integrated circuit board are installed inside the housing. Several ventilation holes connecting the inside and outside of the housing are provided on the housing, directly opposite and adjacent to the temperature and humidity sensing element inside the housing. The LCD screen is a transflective LCD screen. A backlight for displaying content on the LCD screen in dark environments is also installed inside the housing. The integrated circuit board includes a microcontroller unit and a power supply circuit, a temperature signal acquisition circuit, a humidity signal acquisition circuit, an LCD screen driving circuit, a backlight control circuit, a backlight switch, and a clear configuration button circuit connected to the microcontroller unit. The LCD screen driving circuit is connected to the LCD screen, and the backlight control circuit is connected to the backlight. The microcontroller unit integrates a Wi-Fi module and can wirelessly connect to a network router and transmit data through the Wi-Fi module.

[0005] Preferably, the microcontroller unit is ESP8684-WROOM-02C, with its NTC pin connected to the temperature signal acquisition circuit, XD-1, XD-2, and XD-3 pins connected to the humidity signal acquisition circuit, +3.3V and +2.5V pins connected to the power supply circuit, LED pin connected to the backlight control circuit, k1 pin connected to the backlight switch and clear configuration button circuit, and CS, WR, and DATA pins connected to the LCD screen driving circuit.

[0006] Preferably, the power supply circuit includes a DC interface circuit, a TYPC-C interface circuit, a DC-DC circuit for converting +5V to +24V to +3.3V, and a conversion circuit for converting +3.3V to +2.5V. The +5V to +24V pins of the DC interface circuit and the TYPC-C interface circuit are both connected to the +5V to +24V pins of the DC-DC circuit. The +3.3V pin of the DC-DC circuit is connected to the +3.3V pins of the conversion circuit, the microcontroller, the temperature signal acquisition circuit, the LCD screen driving circuit, the backlight control circuit, and the backlight switch and clear configuration button circuit. The +2.5V pin of the conversion circuit is connected to the +2.5V pin of the microcontroller.

[0007] Preferably, the DC interface circuit has two parallel DC input / output interfaces, and the TYPC-C interface circuit has one TYPC-C input interface. At any given time, only one DC input / output interface or TYPC-C input interface can be connected to an external power supply. When one of the DC input / output interfaces is connected to an external power supply, the other DC input / output interface can be used as a power output interface.

[0008] Preferably, the temperature signal acquisition circuit consists of an NTC thermistor, a 150KΩ resistor R3, a 100Ω resistor R4, and a 0.1μF capacitor C1. The NTC thermistor is connected in series with the resistor R3, and the other end of the NTC thermistor is grounded. The other end of the resistor R3 is connected to the +3.3V pin of the DC-DC circuit. The resistor R4 and the capacitor C1 are connected in series, and the other end of the resistor R4 is connected to the circuit connecting the NTC thermistor and the resistor R3. The other end of the capacitor C1 is grounded. The circuit connecting the resistor R4 and the capacitor C1 is connected to the NTC pin of the microcontroller ESP8684-WROOM-02C.

[0009] Preferably, the humidity signal acquisition circuit consists of a humidity sensor HR202L, a 1.5MΩ resistor R21, a 10KΩ resistor R25, and a 150KΩ resistor R20 connected together. The humidity sensor HR202L is connected in parallel with the resistor R21. One end of the resistors R21, R25, and R20 are connected in a common circuit, and the other end is connected sequentially to pins XD-1, XD-2, and XD-3 of the microcontroller ESP8684-WROOM-02C.

[0010] Preferably, the backlight switch and clear configuration button circuit consists of a 10KΩ resistor R5, a 1KΩ resistor R22, a tactile switch K1, and a 0.1μF capacitor C16 connected together. The resistors R5, R22, and K1 are connected in series. The other end of the resistor R5 is connected to the +3.3V pin of the DC-DC circuit, and the other end of the tactile switch K1 is grounded. The circuit connecting the resistors R5 and R22 is connected to pin k1 of the microcontroller ESP8684-WROOM-02C and one end of the capacitor C16, respectively. The other end of the capacitor C16 is grounded.

[0011] Preferably, the IoT temperature and humidity monitoring terminal further includes a bracket, the front shell and the rear shell are connected by a snap fastener, the vent is located on the upper part of the rear end of the rear shell, and the lower part of the rear end of the rear shell is provided with a U-shaped step that is recessed towards the front end of the rear shell for hinged connection and to accommodate the bracket. The bracket is hinged on the opposite side of the U-shaped step. Rotating the bracket backward can open the bracket to realize the support function, and rotating the opened bracket forward can retract the bracket.

[0012] Preferably, the rear cover is further provided with a power input / output interface plug-in window, a power input interface plug-in window, and a button window. The power input / output interface of the power circuit is close to or extends into the power input / output interface plug-in window, the power input interface of the power circuit is close to or extends into the power input interface plug-in window, and the button of the backlight switch and clear configuration button circuit extends out of the button window.

[0013] Preferably, the power input / output interface of the power supply circuit is two parallel DC input / output interfaces, and the power input interface of the power supply circuit is a TYPE-C input interface.

[0014] Preferably, the rear cover is provided with a QR code for linking the network configuration program.

[0015] The microcontroller unit contains firmware that controls its operation.

[0016] This invention utilizes several ventilation holes on the outer casing, positioned directly opposite and adjacent to the temperature and humidity sensing element inside the casing, to connect the inside and outside of the casing, thereby ensuring more accurate collection of external environmental temperature and humidity data. By employing a semi-transparent, semi-reflective LCD screen and installing a backlight inside the casing for displaying the screen's content in dark environments, the backlight can be turned on when temperature and humidity values ​​need to be viewed, and turned off when not in use, thus reducing energy consumption and saving energy. Furthermore, by employing a microcontroller unit with an integrated Wi-Fi module, the device wirelessly connects to a network router and transmits data, enabling remote communication with an IoT cloud server for remote monitoring of the target environment's temperature and humidity. Finally, specially designed temperature and humidity signal acquisition circuits further enhance the accuracy of the collected external environmental temperature and humidity data. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the IoT temperature and humidity monitoring terminal of this utility model in the state of the bracket being retracted, from one perspective. Figure 2 for Figure 1 The diagram shown is a structural schematic of the IoT temperature and humidity monitoring terminal in the retracted state, from another perspective. Figure 3 for Figure 1 The diagram shown is a schematic diagram of the IoT temperature and humidity monitoring terminal with the bracket open. Figure 4 for Figure 2 The diagram shown is a structural schematic of the IoT temperature and humidity monitoring terminal with the bracket open. Figure 5 This is a schematic diagram of the microcontroller unit of the IoT temperature and humidity monitoring terminal according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the DC interface circuit of the IoT temperature and humidity monitoring terminal according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the TYPC-C interface circuit of the IoT temperature and humidity monitoring terminal according to an embodiment of the present invention; Figure 8 This is a schematic diagram of a DC-DC circuit that converts +5V to +24V to +3.3V in an IoT temperature and humidity monitoring terminal according to an embodiment of the present invention. Figure 9 This is a schematic diagram of the conversion circuit for converting +3.3V to +2.5V in the IoT temperature and humidity monitoring terminal of this utility model embodiment; Figure 10 This is a schematic diagram of the temperature signal acquisition circuit of the IoT temperature and humidity monitoring terminal according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the humidity signal acquisition circuit of the IoT temperature and humidity monitoring terminal according to an embodiment of the present invention. Figure 12 This is a schematic diagram of the LCD screen driving circuit of the IoT temperature and humidity monitoring terminal according to an embodiment of the present utility model. Figure 13 This is a schematic diagram of the LCD screen module of the IoT temperature and humidity monitoring terminal according to an embodiment of the present utility model; Figure 14 This is a schematic diagram of the backlight control circuit of the Internet of Things temperature and humidity monitoring terminal according to an embodiment of the present utility model. Figure 15 This is a schematic diagram of the backlight switch and clear configuration button circuit of the IoT temperature and humidity monitoring terminal according to an embodiment of the present utility model. In the picture: 1. Front shell; 2. Rear shell; 3. Bracket; 4. LCD screen; 5. Vent hole. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0019] like Figures 1-15 As shown, the IoT temperature and humidity monitoring terminal of this embodiment includes a housing, an LCD screen 4, and an integrated circuit board. The housing includes a front shell 1 and a rear shell 2. The front shell 1 has an LCD screen viewing window at its front end. The LCD screen 4 and the integrated circuit board are installed inside the housing. Several ventilation holes 5 are provided on the housing, directly opposite and adjacent to the temperature and humidity sensing element inside the housing, connecting the inside and outside of the housing. The LCD screen 4 is a transflective LCD screen. A backlight is also installed inside the housing for displaying content on the LCD screen 4 in dark environments. The integrated circuit board includes a microcontroller unit and a power supply circuit, a temperature signal acquisition circuit, and a humidity signal acquisition circuit connected to the microcontroller unit. The system includes an LCD screen driving circuit, a backlight control circuit, a backlight switch, and a clear configuration button circuit. The LCD screen driving circuit is connected to the LCD screen (in this embodiment, an XF-3420 LCD screen manufactured by Foshan Shunde Xufeng Electronics Technology Co., Ltd. is used). The backlight control circuit is connected to the backlight (in this embodiment, an XF25T6869-3W backlight manufactured by Foshan Shunde Xufeng Electronics Technology Co., Ltd. is used). The microcontroller unit is equipped with firmware that controls its operation. The microcontroller unit integrates a Wi-Fi module and can wirelessly connect to a network router and transmit data through the Wi-Fi module.

[0020] The microcontroller unit is ESP8684-WROOM-02C. Its NTC pin is connected to the temperature signal acquisition circuit, XD-1, XD-2 and XD-3 pins are connected to the humidity signal acquisition circuit, +3.3V and +2.5V pins are connected to the power supply circuit, LED pin is connected to the backlight control circuit, k1 pin is connected to the backlight switch and clear configuration button circuit, and CS, WR and DATA pins are connected to the LCD screen driver circuit.

[0021] The power supply circuit includes a DC interface circuit, a TYPC-C interface circuit, a DC-DC circuit for converting +5V to +24V to +3.3V, and a conversion circuit for converting +3.3V to +2.5V. The +5V to +24V pins of the DC interface circuit and the TYPC-C interface circuit are both connected to the +5V to +24V pins of the DC-DC circuit. The +3.3V pin of the DC-DC circuit is connected to the +3.3V pins of the conversion circuit, the microcontroller unit, the temperature signal acquisition circuit, the LCD screen driving circuit, the backlight control circuit, and the backlight switch and clear configuration button circuit. The +2.5V pin of the conversion circuit is connected to the +2.5V pin of the microcontroller unit.

[0022] The DC interface circuit has two parallel DC input / output interfaces, and the TYPC-C interface circuit has one TYPC-C input interface. At any given time, only one DC input / output interface or TYPC-C input interface can be connected to an external power supply. When one of the DC input / output interfaces is connected to an external power supply, the other DC input / output interface can be used as a power output interface.

[0023] The temperature signal acquisition circuit consists of an NTC thermistor, a 150KΩ resistor R3, a 100Ω resistor R4, and a 0.1μF capacitor C1. The NTC thermistor is connected in series with resistor R3, and the other end of the NTC thermistor is grounded. The other end of resistor R3 is connected to the +3.3V pin of the DC-DC circuit. Resistor R4 and capacitor C1 are connected in series, and the other end of resistor R4 is connected to the circuit connecting the NTC thermistor and resistor R3. The other end of capacitor C1 is grounded, and the circuit connecting resistor R4 and capacitor C1 is connected to the NTC pin of the microcontroller ESP8684-WROOM-02C. The NTC thermistor is a temperature sensing element. The temperature signal is converted into a voltage signal by the change in the resistance of the NTC thermistor. The voltage divider circuit formed by the NTC thermistor and resistor R3 in series, and the RC filter network formed by resistor R4 and capacitor C1 in series, ensure the stability and accuracy of the signal.

[0024] Preferably, the humidity signal acquisition circuit consists of a humidity sensor HR202L, a 1.5MΩ resistor R21, a 10KΩ resistor R25, and a 150KΩ resistor R20 connected together. The humidity sensor HR202L is connected in parallel with resistor R21. One end of resistors R21, R25, and R20 is connected in a common circuit, and the other end is sequentially connected to pins XD-1, XD-2, and XD-3 of the microcontroller ESP8684-WROOM-02C. The humidity sensor HR202L is a humidity sensing element.

[0025] The backlight switch and clear configuration button circuit consists of a 10KΩ resistor R5, a 1KΩ resistor R22, a tactile switch K1, and a 0.1μF capacitor C16. The resistors R5, R22, and K1 are connected in series. The other end of the resistor R5 is connected to the +3.3V pin of the DC-DC circuit, and the other end of the tactile switch K1 is grounded. The circuit connecting the resistors R5 and R22 is connected to pin k1 of the microcontroller ESP8684-WROOM-02C and one end of the capacitor C16, respectively. The other end of the capacitor C16 is grounded.

[0026] The IoT temperature and humidity monitoring terminal of this embodiment also includes a bracket 3. The front shell 1 and the rear shell 2 are connected by a snap fastener. The ventilation hole 5 is located on the upper part of the rear end of the rear shell 2. The lower part of the rear end of the rear shell 2 is provided with a U-shaped step that is recessed towards the front end of the rear shell 2 for hinged connection and to accommodate the bracket 3. The bracket 3 is hinged on the opposite side of the U-shaped step. Rotating the bracket 3 backward can open the bracket 3 to realize the support function, so that the IoT temperature and humidity monitoring terminal of this embodiment can be tilted. Rotating the opened bracket 3 forward can retract the bracket 3.

[0027] The rear cover 2 is also provided with a power input / output interface plug-in window, a power input interface plug-in window, and a button window. The power input / output interface of the power circuit is close to or extends into the power input / output interface plug-in window. The power input interface of the power circuit is close to or extends into the power input interface plug-in window. The button of the tactile switch K1 of the backlight switch and clear configuration button circuit extends out of the button window. The power input / output interface of the power circuit is two parallel DC input / output interfaces. The power input interface of the power circuit is a TYPE-C input interface.

[0028] The rear cover 2 has a QR code for connecting to the network configuration program. For example, the QR code for connecting to the network configuration program can be pasted on the lower part of the rear end of the rear cover 2 or in other appropriate locations on the rear cover 2.

[0029] The method of using the IoT temperature and humidity monitoring terminal in this embodiment is as follows: 1. Power on This IoT temperature and humidity monitoring terminal is a plug-and-play device. Simply plug any DC input / output port or TYPE-C input port into a pre-connected power cord to power it on, and unplug the power cord or disconnect it from the power source to power it off. This IoT temperature and humidity monitoring terminal supports 5V DC input power via the TYPE-C input port, and also supports 5-24V DC input power via the DC input / output port. Only one DC input / output port or TYPE-C input port can be connected to an external power source at a time. When one DC input / output port is connected to an external power source, the other DC input / output port can be used as a power output port, for example, to power a router.

[0030] 2. Distribution network After powering on this IoT temperature and humidity monitoring terminal, press and hold the touch switch K1 button on its back for 5 seconds to begin network pairing. At this time, its LCD screen will display... logo; Use WeChat on your phone to scan the QR code on the back cover that links to the network configuration program. Enter the network configuration mini-program and follow the authorization pop-up prompts to authorize your mobile phone number to log in to the mini-program and enter the network configuration interface. On the network configuration interface, select the WIFI name from the drop-down menu or manually enter the WIFI name, then enter the WIFI password. After confirming that the password is correct, click "Next" until the network configuration is completed according to the network configuration guide in the network configuration mini-program.

[0031] This IoT temperature and humidity monitoring terminal adopts an AP network configuration mode, compatible with all mainstream Android phone models on the market, and provides real-time network information feedback. 1. The user presses the button on the K1 touch switch for 5 seconds to trigger the Wi-Fi module AP network configuration program, and the Wi-Fi module starts its AP hotspot; 2. The mobile APP selects the AP hotspot of this IoT temperature and humidity monitoring terminal; 3. The mobile APP connects to the Wi-Fi module AP hotspot, establishes TCP communication, and sends network configuration information to the Wi-Fi module; 4. The Wi-Fi module receives the correct network configuration information, replies with an acknowledgment message, and then the IoT temperature and humidity monitoring terminal closes the AP hotspot and attempts to connect to the router; if the Wi-Fi module parses the network configuration information abnormally, it replies with a network configuration error message and does not close the AP hotspot; 5. The Wi-Fi module successfully connects to the router and attempts to connect to the cloud server; 6. After receiving a successful Wi-Fi module network configuration information parsing reply packet, the mobile app needs to wait for the phone's Wi-Fi to automatically reconnect since the IoT temperature and humidity monitoring terminal has turned off its AP hotspot. Once connected, the app continuously checks if the IoT temperature and humidity monitoring terminal is online. If online, it indicates successful network configuration and redirects to the main interface. If the check exceeds 90 seconds and the IoT temperature and humidity monitoring terminal is still not found online, it indicates network configuration failure and asks the user to try again. If a Wi-Fi module network configuration information parsing failure reply packet is received, it displays "Network configuration failed." Network configuration return results: ok: Connection successful; fail: Connection failed.

[0032] 3. Data transmission This IoT temperature and humidity monitoring terminal uses the lightweight IoT MQTT protocol for data transmission with the IoT cloud platform. The terminal periodically and proactively reports current temperature and humidity data to the designated IoT cloud platform. The default interval is 1 hour, but this interval can be modified via commands issued from the IoT cloud platform. The minimum interval is 10 minutes, and the maximum is 2 hours.

[0033] 4. Turn on the backlight In dark environments, when you need to check temperature and humidity values, briefly press the K1 touch switch button on the back of this IoT temperature and humidity monitoring terminal to activate the backlight for 5 seconds, allowing the LCD screen to display normally for easy viewing. After 5 seconds, the backlight automatically turns off, reducing energy consumption and saving energy. The default backlight activation time is 5 seconds, which can be modified via commands issued from the IoT cloud platform.

[0034] 5. Clear distribution network information When the connection to this IoT temperature and humidity monitoring terminal fails due to a change in the router's password or a replacement router, it needs to be reconfigured. Press and hold the touch switch K1 button on the back of the IoT temperature and humidity monitoring terminal for more than 5 seconds, then release the button. The IoT temperature and humidity monitoring terminal will automatically clear the original network configuration information and enter the network configuration state. The specific network configuration operation and process are as described in "2. Network Configuration" above.

[0035] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Various changes made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present utility model should also be considered within the protection scope of the present utility model.

Claims

1. An Internet of Things (IoT) temperature and humidity monitoring terminal, comprising a housing, an LCD screen, and an integrated circuit board, wherein the housing includes a front shell and a rear shell, the front end of the front shell is provided with an observation window for the LCD screen, and the LCD screen and the integrated circuit board are installed inside the housing, characterized in that: The outer casing has several ventilation holes connecting the inside and outside of the casing, located opposite and adjacent to the temperature and humidity sensing element inside the casing. The LCD screen is a transflective LCD screen. The casing also has a backlight installed inside for displaying content on the LCD screen in dark environments. The integrated circuit board includes a microcontroller unit and a power supply circuit, a temperature signal acquisition circuit, a humidity signal acquisition circuit, an LCD screen driving circuit, a backlight control circuit, a backlight switch, and a clear configuration button circuit connected to the microcontroller unit. The LCD screen driving circuit is connected to the LCD screen, and the backlight control circuit is connected to the backlight. The microcontroller unit integrates a Wi-Fi module and can wirelessly connect to a network router and transmit data through the Wi-Fi module.

2. The IoT temperature and humidity monitoring terminal according to claim 1, characterized in that: The microcontroller unit is ESP8684-WROOM-02C. Its NTC pin is connected to the temperature signal acquisition circuit, XD-1, XD-2 and XD-3 pins are connected to the humidity signal acquisition circuit, +3.3V and +2.5V pins are connected to the power supply circuit, LED pin is connected to the backlight control circuit, k1 pin is connected to the backlight switch and clear configuration button circuit, and CS, WR and DATA pins are connected to the LCD screen driver circuit.

3. The IoT temperature and humidity monitoring terminal according to claim 1, characterized in that: The power supply circuit includes a DC interface circuit, a TYPC-C interface circuit, a DC-DC circuit for converting +5V to +24V to +3.3V, and a conversion circuit for converting +3.3V to +2.5V. The +5V to +24V pins of the DC interface circuit and the TYPC-C interface circuit are both connected to the +5V to +24V pins of the DC-DC circuit. The +3.3V pin of the DC-DC circuit is connected to the +3.3V pins of the conversion circuit, the microcontroller unit, the temperature signal acquisition circuit, the LCD screen driving circuit, the backlight control circuit, and the backlight switch and clear configuration button circuit. The +2.5V pin of the conversion circuit is connected to the +2.5V pin of the microcontroller unit.

4. The IoT temperature and humidity monitoring terminal according to claim 3, characterized in that: The DC interface circuit has two parallel DC input / output interfaces, and the TYPC-C interface circuit has one TYPC-C input interface. At any given time, only one DC input / output interface or TYPC-C input interface can be connected to an external power supply. When one of the DC input / output interfaces is connected to an external power supply, the other DC input / output interface can be used as a power output interface.

5. The IoT temperature and humidity monitoring terminal according to claim 3, characterized in that: The temperature signal acquisition circuit consists of an NTC thermistor, a 150KΩ resistor R3, a 100Ω resistor R4, and a 0.1μF capacitor C1. The NTC thermistor is connected in series with the resistor R3, and the other end of the NTC thermistor is grounded. The other end of the resistor R3 is connected to the +3.3V pin of the DC-DC circuit. The resistor R4 and the capacitor C1 are connected in series, and the other end of the resistor R4 is connected to the circuit connecting the NTC thermistor and the resistor R3. The other end of the capacitor C1 is grounded. The circuit connecting the resistor R4 and the capacitor C1 is connected to the NTC pin of the microcontroller ESP8684-WROOM-02C.

6. The IoT temperature and humidity monitoring terminal according to claim 2, characterized in that: The humidity signal acquisition circuit consists of a humidity sensor HR202L, a 1.5MΩ resistor R21, a 10KΩ resistor R25, and a 150KΩ resistor R20. The humidity sensor HR202L is connected in parallel with the resistor R21. One end of the resistors R21, R25, and R20 are connected in a common circuit, and the other end is connected sequentially to pins XD-1, XD-2, and XD-3 of the microcontroller ESP8684-WROOM-02C.

7. The IoT temperature and humidity monitoring terminal according to claim 3, characterized in that: The backlight switch and clear configuration button circuit consists of a 10KΩ resistor R5, a 1KΩ resistor R22, a tactile switch K1, and a 0.1μF capacitor C16. The resistors R5, R22, and K1 are connected in series. The other end of the resistor R5 is connected to the +3.3V pin of the DC-DC circuit, and the other end of the tactile switch K1 is grounded. The circuit connecting the resistors R5 and R22 is connected to pin k1 of the microcontroller ESP8684-WROOM-02C and one end of the capacitor C16, respectively. The other end of the capacitor C16 is grounded.

8. The IoT temperature and humidity monitoring terminal according to claim 1, characterized in that: It also includes a bracket. The front shell and the rear shell are connected by a snap-fit. The vent is located on the upper part of the rear end of the rear shell. The lower part of the rear end of the rear shell is provided with a U-shaped step that is recessed towards the front end of the rear shell for hinge and to accommodate the bracket. The bracket is hinged to the opposite side of the U-shaped step. Rotating the bracket backward can open the bracket and realize the support function. Rotating the opened bracket forward can retract the bracket.

9. The IoT temperature and humidity monitoring terminal according to claim 1, characterized in that: The rear cover is also provided with a power input / output interface plug-in window, a power input interface plug-in window and a button window. The power input / output interface of the power circuit is close to or extends into the power input / output interface plug-in window, the power input interface of the power circuit is close to or extends into the power input interface plug-in window, and the button of the backlight switch and clear configuration button circuit extends out of the button window.

10. The IoT temperature and humidity monitoring terminal according to claim 9, characterized in that: The power input / output interface of the power supply circuit consists of two parallel DC input / output interfaces, and the power input interface of the power supply circuit is a TYPE-C input interface.

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