NB-IoT pressure and temperature monitor

Abstract

The utility model discloses an NB-IoT (Narrow Band Internet of Things) pressure and temperature monitor, which comprises a microcontroller, a wireless module communication circuit, an atmospheric pressure detection circuit, a gas pressure monitoring circuit, a key scanning input circuit, a data storage circuit, a power supply management circuit and a power supply, the microcontroller is connected with the atmospheric pressure detection circuit, the gas pressure monitoring circuit and the data storage circuit through the IIC communication interface; the microcontroller is also connected with the NB-IoT communication circuit and the key scanning input circuit; the power supply end of the microcontroller is connected with a power supply through a power supply management circuit. According to the utility model, the technical problem of low response speed in the existing fuel gas pressure monitoring technical field can be effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas pipeline network pressure monitoring, and specifically relates to an NB-IoT pressure and temperature monitor. Background Art

[0002] Now, a large number of devices can be connected through the Internet of Things (IoT). In order to support communication and data exchange between connected devices, low-cost, low-power, wide-coverage, and highly reliable wireless connection technology is needed. With the launch of 5G, operators need to upgrade their networks to meet the growing demand for IoT devices. NB-IoT (Narrowband Internet of Things) provides extremely stable connections for low-power devices and can utilize existing 4G network infrastructure, thereby reducing the network upgrade costs of operators. At present, most of the domestic gas pipeline network monitoring uses strain gauge pressure sensors. This type of sensor has low sensitivity and response speed. Affected by the geometry, thickness, and elastic modulus of the strain gauge, the material of the strain gauge pressure sensor is usually brittle and easily damaged by mechanical vibration and impact. Utility Model Content

[0003] The purpose of the utility model is to provide an NB-IoT pressure and temperature monitor to solve the technical problem of low response speed in the existing field of gas pressure monitoring technology.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A NB-IoT pressure and temperature monitor comprises a microcontroller, a wireless module communication circuit, an atmospheric pressure detection circuit, a gas pressure monitoring circuit, a key scanning input circuit, a data storage circuit, a power management circuit and a power supply, wherein the microcontroller is connected to the atmospheric pressure detection circuit, the gas pressure monitoring circuit and the data storage circuit through an IIC communication interface; the microcontroller is also connected to the NB-IoT communication circuit and the key scanning input circuit; and the power supply end of the microcontroller is connected to the power supply through the power management circuit.

[0006] The utility model also includes the following other technical features:

[0007] The microcontroller adopts a chip U1 of model MSP430F2418, and the 17th terminal AT_SDA, the 18th terminal AT_SCL, and the 19th terminal AT24_VCC of the chip U1 are connected to the data storage circuit; the communication terminal 20th terminal ALPS_SDA, the 21st terminal ALPS_SLC, and the 22nd terminal ALPS_VCC of the chip U1 are connected to the gas pressure monitoring circuit; the communication terminal 25th terminal BMP_SDA, the 26th terminal BMP_SCL, and the 27th terminal BMP_VCC of the chip U1 are connected to the atmospheric pressure detection circuit; the communication terminal 32nd terminal MCU_TXD, the 33rd terminal MCU_RXD, the 36th terminal VCC_UART, the 45th terminal NB_RST, and the 44th terminal NB_BOOT of the chip U1 are connected to the wireless module communication circuit; the power supply terminal 1st terminal DVCC, the 64th terminal AVCC, the 63rd terminal DVSS, and the 62nd terminal AVSS of the chip U1 are connected to the power supply.

[0008] The wireless module communication circuit includes a NB_IoT module, a level conversion circuit, and a SIM card U3, wherein the NB_IoT module is connected to the UART communication terminal of the microcontroller via the level conversion circuit through the UART interface;

[0009] The NB-IoT module includes a module U2 of model UMN601-M1, including capacitors C10, C11, C12, C16, terminal J3 and antenna interface ANT, wherein terminal 1 DBG_TXD of module U2 is connected to terminal 1 of terminal J3, terminal 2 DBG_RXD of module U2 is connected to terminal 3 of terminal J3; terminals 9 and 10 of module U2 are connected to the level conversion circuit; terminals 12, 13, 14 and 15 of module U2 are respectively connected to the SIM card; terminal 17 of module U2 is connected to terminal 45 NB_RST of chip U1, and terminal 19 of module U2 is connected to chip Terminal 44 of U1 is connected to NB_BOOT; terminal 20 of module U2 is connected to one end of capacitor C16 and the level conversion circuit; terminals 22, 23, 25, 26, 28, 29 and 30 of module U2 are all connected to the common GND; terminal 27 of module U2 is connected to terminal 1 of the antenna interface ANT; terminals 31 and 32 of module U2 are respectively connected to one end of capacitor C10, capacitor C11 and capacitor C12 and terminal 5 of power management chip U4 V_GSM; the other end of capacitor C10, the other end of capacitor C11 and the other end of capacitor C12 are connected to the common GND;

[0010] The level conversion circuit includes transistor Q1, transistor Q2, resistor R11, resistor R12, resistor R13 and resistor R14, wherein terminal 1 of transistor Q1 is connected to one end of resistor R12, the other end of resistor R12 is connected to terminal 20 VDD_EXT of NB-IoT module, terminal 2 of transistor Q1 is connected to terminal 9 UTXD of NB-IoT module, terminal 3 of transistor Q1 is connected to terminal 33 MCU_RXD of microcontroller and one end of resistor R11, and resistor The other end of R11 is connected to the microcontroller terminal 36 VCC_UART; the 1 end of transistor Q2 is connected to one end of resistor R14, the other end of resistor R14 is connected to the microcontroller terminal 36 VCC_UART, the 2 end of Q2 is connected to the microcontroller terminal 32 MCU_TXD, the 3 end of Q2 is connected to one end of resistor R13 and the 10 end URXD of the NB-IoT module, and the other end of R13 is connected to the 20 end VDD_EXT of the NB-IoT module;

[0011] The SIM card circuit includes a SIM card and a capacitor C15, wherein terminal 3 SIM_DATA, terminal 6 SIM_CLK, terminal 7 SIM_RST, and terminal 8 SIM_VCC of the SIM card are sequentially connected to terminal 14 SIM_DATA, terminal 13 SIM_CLK, terminal 12 SIM_RST, and terminal 15 SIM_VCC of the wireless module communication circuit; the two ends of the capacitor C15 are respectively connected to terminal 1 GND and terminal 8 SIM_VCC of the SIM card.

[0012] The power management circuit includes an integrated module U4 of model SY7072A, an inductor L1, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor E1, a resistor R6, a resistor R7, a resistor R8, a diode D1, a diode D2 and a terminal J1, wherein the 1st terminal SW of SY7072A is connected to the inductor L1; the 6th terminal of SY7072A is commonly connected to the battery BAT, one end of the capacitor C7, one end of the capacitor C8, and the other end of L1; the 4th terminal NB_PWK of SY7072A is connected to the 31st terminal of the microcontroller; the 2nd terminal GND of SY7072A is respectively connected to the other end of the capacitor C7, the other end of the capacitor C8, one end of the resistor R6, One end of capacitor C9 and one end of capacitor E1 are connected together; terminal FB of SY7072A is connected together with the other end of resistor R6 and one end of resistor R7; terminal VO of SY7072A is respectively connected with one end of resistor R8, the other end of capacitor C9, the other end of capacitor E1, one end of diode D2, and power supply terminals 31 and 32 of NB-IoT module; the other end of resistor R7 is connected with the other end of resistor R8; the other end of diode D2 is connected with terminal DVCC and terminal AVCC of microcontroller 1 and terminal AVCC of microcontroller 64; battery BAT is connected with VCC of microcontroller through diode D1 (VCC is connected with terminal DVCC and terminal AVCC of microcontroller 1 and terminal AVCC of microcontroller 64).

[0013] The atmospheric pressure detection circuit includes a pressure sensor of model BMP280, a resistor R21, a resistor R22, a resistor R23 and a resistor R24, wherein the GND terminal of the pressure sensor 1 is connected to the common GND, the CSB terminal of the pressure sensor 2 is connected to one end of the resistor R23, the BMP_SDA terminal of the pressure sensor 3 is connected to the BMP_SDA terminal of the microcontroller 25 and one end of the resistor R22; the BMP_SCL terminal of the pressure sensor 4 is connected to the BM terminal of the microcontroller 26 P_SCL and the other end of the resistor R21 are connected together; the 5-terminal SDO of the pressure sensor is connected to one end of the resistor R24, the 6-terminal VVDDIO and the 8-terminal VDD of the pressure sensor are respectively connected to the 27-terminal BMP_VCC of the microcontroller, one end of the capacitor C13, one end of C14, the other end of the resistor R21, the other end of the resistor R22, and the other end of the resistor R23; the 7-terminal GND of the pressure sensor is connected to the common GND with the other ends of the capacitors C13 and C14 and the other end of the resistor R24.

[0014] The gas pressure monitoring circuit includes a pressure sensor of model HSPPAD143C, a resistor R16 and a resistor R17, wherein the GND of the pressure sensor 1 is connected to the common GND, the ALPS_VCC of the pressure sensor 2 is connected to the ALPS_VCC of the microcontroller 20, one end of the resistor R16, and one end of the resistor R17; the ALPS_SCL of the pressure sensor 3 is respectively connected to the ALPS_SCL of the microcontroller 21 and the other end of the resistor R17; the ALPS_SCL of the pressure sensor 4 is connected to the ALPS_SDA of the microcontroller 22 and the other end of the resistor R16.

[0015] The data storage circuit includes a storage module of model AT24C512, a resistor R18 and a resistor R19, wherein terminal 1 NC, terminal 2 NC, terminal 3 NC, terminal 4 GND and terminal 7 TEST of the storage module are respectively connected to the common GND, terminal 5 AT_SDA of the storage module is commonly connected to terminal 17 AT_SDA of the microcontroller and one end of the resistor R19; terminal 6 AT_SCL of the storage module is commonly connected to terminal 18 AT_SCL of the microcontroller and one end of the resistor R18; terminal 8 AT24_VCC of the storage module is commonly connected to terminal 19 AT24_VCC of the microcontroller, the other end of the resistor R18 and the other end of the resistor R19.

[0016] The key input detection circuit includes a resistor R2, a capacitor C5 and a key J2, wherein the 2nd terminal KEY of the key J2 is connected to the 38th terminal KEY of the microcontroller, one end of the resistor R2, and one end of the capacitor C5; the 1st terminal of the key is connected to the common GND with the other end of the capacitor C5; the other end of the resistor R2 is connected to the common power supply VCC.

[0017] The power source BAT adopts a single 3.6V lithium battery.

[0018] The value of R2 is 300K, the value of R6 is 1M, the value of R7 is 100K, the value of R8 is 2M, the value of R5, R11, R12, R13, R14, R16, R17, R18, and R19 is 10K; the value of C1, C5, C11, C15, C8, C9, C13, and C14 is 100nF; the value of C2 and C3 is 22pF; the value of C10 is 100uF, the value of C12 is 33pF, the value of C7 is 10uF, and the value of E1 is 1000uF.

[0019] Compared with the prior art, the utility model has the following technical effects:

[0020] 1. Regularly collect pressure and temperature data. The internal real-time clock of the microcontroller is used to realize the function of regularly collecting pressure and temperature data.

[0021] 2. Regular data reporting: Due to the use of the real-time clock inside the microcontroller, the function of regular data reporting can be realized, which improves the response speed.

[0022] 3. If the status changes, such as undervoltage, overvoltage, low temperature, high temperature, and low power, the alarm data can be uploaded to the management platform through the NB module.

[0023] 4. Real-time monitoring of pressure and temperature. Since the pressure and temperature data are collected once a minute, real-time monitoring of pressure and temperature can be achieved, which improves the response speed.

[0024] 5. The IoT devices have the requirements of low cost and low power consumption. It has low cost, low power consumption, simple construction, and automatically uploads data through NB-IoT narrowband IoT. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of the NB-IoT pressure and temperature monitor of the utility model;

[0026] Figure 2 is the circuit diagram of the microcontroller;

[0027] FIG3(a) is a structural diagram of the NB-IoT module U2; FIG3(b) is a structural diagram of the signal level conversion circuit; FIG3(c) is a structural diagram of the SIM card U3;

[0028] Figure 4 This is the power management circuit diagram;

[0029] Figure 5 This is the atmospheric pressure detection circuit diagram;

[0030] Figure 6 This is the gas pressure monitoring circuit diagram;

[0031] Figure 7 Circuit diagram for storing data;

[0032] Figure 8 This is the circuit diagram for key input detection. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0034] See Figure 1 The NB-IoT pressure and temperature monitor provided by the utility model includes a microcontroller (MCU), a wireless module communication circuit, an atmospheric pressure detection circuit, a gas pressure monitoring circuit, a key scanning input circuit, a data storage circuit, a power management circuit and a power supply. Among them, the microcontroller is connected to the atmospheric pressure detection circuit, the gas pressure monitoring circuit, and the data storage circuit through the IIC communication interface; the microcontroller is also connected to the NB-IoT communication circuit and the key scanning input circuit; the power supply end of the microcontroller is connected to the power supply through the power management circuit.

[0035] In the above technical solution, the power supply is divided into two power supply routes, one route is to supply power to the wireless module communication circuit through the power management circuit (the SIM card is powered by the NB module), and the other route is to supply power to the MCU through the diode.

[0036] The MCU reads the pressure digital signal collected by the atmospheric pressure detection circuit through the IIC interface, and reads the pressure and temperature digital signals collected by the gas pressure monitoring circuit through the IIC interface. After the pressure and temperature values ​​are processed by the MCU, they are stored in the data storage circuit through the IIC interface. The pressure and temperature data are then sent to the telecom cloud platform through the NB-IoT communication circuit via the MCU's UART interface.

[0037] See Figure 2 The microcontroller (MCU) adopts a chip U1 of model MSP430F2418. The 17th terminal AT_SDA, the 18th terminal AT_SCL, and the 19th terminal AT24_VCC of the chip U1 are connected to the data storage circuit; the communication terminal 20th terminal ALPS_SDA, the 21st terminal ALPS_SLC, and the 22nd terminal ALPS_VCC of the chip U1 are connected to the gas pressure monitoring circuit; the communication terminal 25th terminal BMP_SDA, the 26th terminal BMP_SCL, and the 27th terminal BMP_VCC of the chip U1 are connected to the atmospheric pressure detection circuit; the communication terminal 32nd terminal MCU_TXD, the 33rd terminal MCU_RXD, the 36th terminal VCC_UART, the 45th terminal NB_RST, and the 44th terminal NB_BOOT of the chip U1 are connected to the wireless module communication circuit; the power supply terminal 1st terminal DVCC, the 64th terminal AVCC, the 63rd terminal DVSS, and the 62nd terminal AVSS of the chip U1 are connected to the power supply.

[0038] The wireless module communication circuit includes a NB_IoT module (see Figure 3(a)), a level conversion circuit (see Figure 3(b)), and a SIM card U3 (see Figure 3(c)), wherein the NB_IoT module is connected to the UART communication terminal of the microcontroller via the level conversion circuit through the UART interface.

[0039] As shown in Figure 3(a), the NB-IoT module includes a module U2 of model UMN601-M1, including capacitors C10, C11, C12, C16, terminal J3 and antenna interface ANT. Among them, terminal 1 DBG_TXD of module U2 is connected to terminal 1 of terminal J3, terminal 2 DBG_RXD of module U2 is connected to terminal 3 of terminal J3; terminals 9 and 10 of module U2 are connected to the level conversion circuit; terminals 12, 13, 14 and 15 of module U2 are connected to the SIM card respectively; terminal 17 of module U2 is connected to terminal 45 NB_RST of chip U1, terminal 19 of module U2 is connected to terminal 44 NB_BOOT of chip U1; terminal 20 VDD_EXT of module U2 is connected to the power supply circuit; One end of capacitor C16 and the level conversion circuit are connected together, and terminals 22, 23, 25, 26, 28, 29 and 30 of module U2 are all connected to the common GND; terminal 27 RF of module U2 is connected to terminal 1 of the antenna interface ANT; terminals 31 and 32 of module U2 are respectively connected to capacitor C10, capacitor C11, one end of capacitor C12 and terminal 5 V_GSM of the power management chip U4, and the other end of capacitor C10, the other end of capacitor C11 and the other end of capacitor C12 are connected to the common GND.

[0040] As shown in FIG. 3( b ), the level conversion circuit includes a transistor Q1 , a transistor Q2 , a resistor R11 , a resistor R12 , a resistor R13 , and a resistor R14 . Among them, end 1 of the transistor Q1 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to the 20-terminal VDD_EXT of the NB-IoT module, end 2 of the transistor Q1 is connected to the 9-terminal UTXD of the NB-IoT module, end 3 of the transistor Q1 is commonly connected to the 33-terminal MCU_RXD of the microcontroller and one end of the resistor R11, and the other end of the resistor R11 is connected to the 36-terminal VCC_UART of the microcontroller; end 1 of the transistor Q2 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the 36-terminal VCC_UART of the microcontroller, end 2 of Q2 is connected to the 32-terminal MCU_TXD of the microcontroller, end 3 of Q2 is commonly connected to one end of the resistor R13 and the 10-terminal URXD of the NB-IoT module, and the other end of R13 is connected to the 20-terminal VDD_EXT of the NB-IoT module.

[0041] As shown in Figure 3(c), the SIM card circuit includes a SIM card (U3) and a capacitor C15, wherein terminal 3 SIM_DATA, terminal 6 SIM_CLK, terminal 7 SIM_RST, and terminal 8 SIM_VCC of the SIM card are connected to terminal 14 SIM_DATA, terminal 13 SIM_CLK, terminal 12 SIM_RST, and terminal 15 SIM_VCC of the wireless module communication circuit in sequence; the two ends of the capacitor C15 are respectively connected to terminal 1 GND and terminal 8 SIM_VCC of the SIM card.

[0042] See Figure 4 The power management circuit includes an integrated module U4 of model SY7072A, an inductor L1, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor E1, a resistor R6, a resistor R7, a resistor R8, a diode D1, a diode D2 and a terminal J1. Among them, the 1st terminal SW of SY7072A is connected to the inductor L1; the 6th terminal of SY7072A is connected to the battery BAT, one end of the capacitor C7, one end of the capacitor C8, and the other end of L1; the 4th terminal NB_PWK of SY7072A is connected to the 31st terminal of the microcontroller; the 2nd terminal GND of SY7072A is respectively connected to the other end of the capacitor C7, the other end of the capacitor C8, one end of the resistor R6, one end of the capacitor C9, and one end of the capacitor E1; the 3rd terminal FB of SY7072A is connected to the other end of the resistor R6, the other end of the resistor One end of R7 is connected together; terminal VO of SY7072A is respectively connected to one end of resistor R8, the other end of capacitor C9, the other end of capacitor E1, one end of diode D2, and power supply terminals 31 and 32 of module U2; the other end of resistor R7 is connected to the other end of resistor R8; the other end of diode D2 is connected to terminal DVCC 1 and terminal AVCC 64 of the microcontroller; battery BAT is connected to VCC of the microcontroller through diode D1 (VCC is connected to terminal DVCC 1 and terminal AVCC 64 of the microcontroller).

[0043] See Figure 5The atmospheric pressure detection circuit includes an atmospheric pressure sensor (U5) of model BMP280, a resistor R21, a resistor R22, a resistor R23 and a resistor R24. Among them, terminal 1 GND of the pressure sensor is connected to the common GND, terminal 2 CSB of the pressure sensor is connected to one end of the resistor R23, terminal 3 BMP_SDA of the pressure sensor is commonly connected to terminal 25 BMP_SDA of the microcontroller and one end of the resistor R22; terminal 4 BMP_SCL of the pressure sensor is commonly connected to terminal 26 BMP_SCL of the microcontroller and the other end of the resistor R21; terminal 5 SDO of the pressure sensor is connected to one end of the resistor R24, terminal 6 VDDIO and terminal 8 VDD of the pressure sensor are respectively commonly connected to terminal 27 BMP_VCC of the microcontroller, one end of the capacitor C13, one end of C14, the other end of the resistor R21, the other end of the resistor R22, and the other end of the resistor R23; terminal 7 GND of the pressure sensor is commonly connected to the common GND with the other ends of the capacitors C13 and C14 and the other end of the resistor R24.

[0044] See Figure 6 The gas pressure monitoring circuit includes a pressure sensor (U6) of model HSPPAD143C, a resistor R16 and a resistor R17. Among them, the GND of the pressure sensor 1 is connected to the common GND, the ALPS_VCC of the pressure sensor 2 is connected to the ALPS_VCC of the microcontroller 20, one end of the resistor R16, and one end of the resistor R17; the ALPS_SCL of the pressure sensor 3 is connected to the ALPS_SCL of the microcontroller 21 and the other end of the resistor R17; the ALPS_SDA of the pressure sensor 4 is connected to the ALPS_SDA of the microcontroller 22 and the other end of the resistor R16.

[0045] See Figure 7 , the data storage circuit includes a storage module (U7) of model AT24C512, a resistor R18 and a resistor R19. Among them, the NC terminal 1, the NC terminal 2, the NC terminal 3, the GND terminal 4 and the TEST terminal 7 of the storage module are respectively connected to the common GND, the AT_SDA terminal 5 of the storage module is commonly connected to the AT_SDA terminal 17 of the microcontroller and one end of the resistor R19; the AT_SCL terminal 6 of the storage module is commonly connected to the AT_SCL terminal 18 of the microcontroller and one end of the resistor R18; the AT24_VCC terminal 8 of the storage module is commonly connected to the AT24_VCC terminal 19 of the microcontroller, the other end of the resistor R18 and the other end of the resistor R19.

[0046] See Figure 8The key input detection circuit includes a resistor R2, a capacitor C5 and a key J2. The 2nd terminal KEY of the key J2 is connected to the 38th terminal KEY of the microcontroller, one end of the resistor R2 and one end of the capacitor C5; the 1st terminal of the key is connected to the common GND with the other end of the capacitor C5; the other end of the resistor R2 is connected to the common power supply VCC.

[0047] Preferably, the power supply BAT is powered by a single 3.6V lithium battery ES-261520 / W.

[0048] In this embodiment, R2 takes a value of 300K, R6 takes a value of 1M, R7 takes a value of 100K, R8 takes a value of 2M, R5, R11, R12, R16, R17, R18, R19, resistor R21, resistor R22, resistor R23 and resistor R24 ​​take a value of 10K; R13 and R14 are both 5.1K; C1, C5, C11, C15, C8, C9, C13, C14 take a value of 100nF; C2 and C3 take a value of 22pF; C10 takes a value of 100uF, C12 takes a value of 33pF, C7 takes a value of 10uF, and E1 takes a value of 1000uF.

Claims

1. A NB-IoT pressure and temperature monitor, characterized in that: It includes a microcontroller, a wireless module communication circuit, an atmospheric pressure detection circuit, a gas pressure monitoring circuit, a key scanning input circuit, a data storage circuit, a power management circuit and a power supply, wherein the microcontroller is connected to the atmospheric pressure detection circuit, the gas pressure monitoring circuit and the data storage circuit through an IIC communication interface; the microcontroller is also connected to the NB-IoT communication circuit and the key scanning input circuit; the power supply end of the microcontroller is connected to the power supply through the power management circuit; The microcontroller adopts a chip U1 of model MSP430F2418, and the 17th terminal AT_SDA, the 18th terminal AT_SCL, and the 19th terminal AT24_VCC of the chip U1 are connected to the data storage circuit; the communication terminal 20th terminal ALPS_SDA, the 21st terminal ALPS_SLC, and the 22nd terminal ALPS_VCC of the chip U1 are connected to the gas pressure monitoring circuit; the communication terminal 25th terminal BMP_SDA, the 26th terminal BMP_SCL, and the 27th terminal BMP_VCC of the chip U1 are connected to the atmospheric pressure detection circuit; the communication terminal 32nd terminal MCU_TXD, the 33rd terminal MCU_RXD, the 36th terminal VCC_UART, the 45th terminal NB_RST, and the 44th terminal NB_BOOT of the chip U1 are connected to the wireless module communication circuit; the power supply terminal 1st terminal DVCC, the 64th terminal AVCC, the 63rd terminal DVSS, and the 62nd terminal AVSS of the chip U1 are connected to the power supply; The wireless module communication circuit includes a NB_IoT module, a level conversion circuit, and a SIM card U3, wherein the NB_IoT module is connected to the UART communication terminal of the microcontroller via the level conversion circuit through the UART interface; The NB-IoT module includes a module U2 of model UMN601-M1, including capacitors C10, C11, C12, C16, terminal J3 and antenna interface ANT, wherein terminal 1 DBG_TXD of module U2 is connected to terminal 1 of terminal J3, terminal 2 DBG_RXD of module U2 is connected to terminal 3 of terminal J3; terminals 9 and 10 of module U2 are connected to the level conversion circuit; terminals 12, 13, 14 and 15 of module U2 are respectively connected to the SIM card; terminal 17 of module U2 is connected to terminal 45 NB_RST of chip U1, and terminal 19 of module U2 is connected to chip Terminal 44 of U1 is connected to NB_BOOT; terminal 20 of module U2 is connected to one end of capacitor C16 and the level conversion circuit; terminals 22, 23, 25, 26, 28, 29 and 30 of module U2 are all connected to the common GND; terminal 27 of module U2 is connected to terminal 1 of the antenna interface ANT; terminals 31 and 32 of module U2 are respectively connected to one end of capacitor C10, capacitor C11 and capacitor C12 and terminal 5 of power management chip U4 V_GSM; the other end of capacitor C10, the other end of capacitor C11 and the other end of capacitor C12 are connected to the common GND; The level conversion circuit includes transistor Q1, transistor Q2, resistor R11, resistor R12, resistor R13 and resistor R14, wherein terminal 1 of transistor Q1 is connected to one end of resistor R12, the other end of resistor R12 is connected to terminal 20 VDD_EXT of NB-IoT module, terminal 2 of transistor Q1 is connected to terminal 9 UTXD of NB-IoT module, terminal 3 of transistor Q1 is connected to terminal 33 MCU_RXD of microcontroller and one end of resistor R11, and resistor The other end of R11 is connected to the microcontroller terminal 36 VCC_UART; the 1 end of transistor Q2 is connected to one end of resistor R14, the other end of resistor R14 is connected to the microcontroller terminal 36 VCC_UART, the 2 end of Q2 is connected to the microcontroller terminal 32 MCU_TXD, the 3 end of Q2 is connected to one end of resistor R13 and the 10 end URXD of the NB-IoT module, and the other end of R13 is connected to the 20 end VDD_EXT of the NB-IoT module; The SIM card circuit includes a SIM card and a capacitor C15, wherein the SIM card's 3-terminal SIM_DATA, 6-terminal SIM_CLK, 7-terminal SIM_RST, and 8-terminal SIM_VCC are sequentially connected to the 14-terminal SIM_DATA, 13-terminal SIM_CLK, 12-terminal SIM_RST, and 15-terminal SIM_VCC of the wireless module communication circuit; the two ends of the capacitor C15 are respectively connected to the SIM card's 1-terminal GND and the 8-terminal SIM_VCC; The power management circuit includes an integrated module U4 of model SY7072A, an inductor L1, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor E1, a resistor R6, a resistor R7, a resistor R8, a diode D1, a diode D2 and a terminal J1, wherein the 1st terminal SW of SY7072A is connected to the inductor L1; the 6th terminal of SY7072A is commonly connected to the battery BAT, one end of the capacitor C7, one end of the capacitor C8, and the other end of L1; the 4th terminal NB_PWK of SY7072A is connected to the 31st terminal of the microcontroller; the 2nd terminal GND of SY7072A is respectively connected to the other end of the capacitor C7, the other end of the capacitor C8, one end of the resistor R6, One end of capacitor C9 and one end of capacitor E1 are connected together; terminal FB of SY7072A is connected together with the other end of resistor R6 and one end of resistor R7; terminal VO of SY7072A is respectively connected together with one end of resistor R8, the other end of capacitor C9, the other end of capacitor E1, one end of diode D2, and power supply terminals 31 and 32 of NB-IoT module; the other end of resistor R7 is connected to the other end of resistor R8; the other end of diode D2 is connected to terminal DVCC and terminal AVCC of microcontroller 1 and terminal AVCC of 64; battery BAT is connected to VCC of microcontroller through diode D1 (VCC is connected to terminal DVCC and terminal AVCC of microcontroller 1 and 64; The atmospheric pressure detection circuit includes a pressure sensor of model BMP280, a resistor R21, a resistor R22, a resistor R23 and a resistor R24, wherein the GND terminal of the pressure sensor 1 is connected to the common GND, the CSB terminal of the pressure sensor 2 is connected to one end of the resistor R23, the BMP_SDA terminal of the pressure sensor 3 is connected to the BMP_SDA terminal of the microcontroller 25 and one end of the resistor R22; the BMP_SCL terminal of the pressure sensor 4 is connected to the BM terminal of the microcontroller 26 P_SCL and the other end of the resistor R21 are connected together; the 5th terminal SDO of the pressure sensor is connected to one end of the resistor R24, the 6th terminal VVDDIO and the 8th terminal VDD of the pressure sensor are respectively connected to the 27th terminal BMP_VCC of the microcontroller, one end of the capacitor C13, one end of C14, the other end of the resistor R21, the other end of the resistor R22, and the other end of the resistor R23; the 7th terminal GND of the pressure sensor is connected to the common GND with the other ends of the capacitors C13 and C14 and the other end of the resistor R24; The gas pressure monitoring circuit includes a pressure sensor of model HSPPAD143C, a resistor R16 and a resistor R17, wherein the GND of the pressure sensor 1 is connected to the common GND, the ALPS_VCC of the pressure sensor 2 is connected to the ALPS_VCC of the microcontroller 20, one end of the resistor R16, and one end of the resistor R17; the ALPS_SCL of the pressure sensor 3 is respectively connected to the ALPS_SCL of the microcontroller 21 and the other end of the resistor R17; the ALPS_SDA of the pressure sensor 4 is connected to the ALPS_SDA of the microcontroller 22 and the other end of the resistor R16; The data storage circuit includes a storage module of model AT24C512, a resistor R18 and a resistor R19, wherein the NC terminal 1, the NC terminal 2, the NC terminal 3, the GND terminal 4 and the TEST terminal 7 of the storage module are respectively connected to the common GND, the AT_SDA terminal 5 of the storage module is commonly connected to the AT_SDA terminal 17 of the microcontroller and one end of the resistor R19; the AT_SCL terminal 6 of the storage module is commonly connected to the AT_SCL terminal 18 of the microcontroller and one end of the resistor R18; the AT24_VCC terminal 8 of the storage module is commonly connected to the AT24_VCC terminal 19 of the microcontroller, the other end of the resistor R18 and the other end of the resistor R19; The key input detection circuit includes a resistor R2, a capacitor C5 and a key J2, wherein the 2nd terminal KEY of the key J2 is connected to the 38th terminal KEY of the microcontroller, one end of the resistor R2, and one end of the capacitor C5; the 1st terminal of the key is connected to the common GND with the other end of the capacitor C5; the other end of the resistor R2 is connected to the common power supply VCC.

2. The NB-IoT pressure and temperature monitor according to claim 1, characterized in that: The power source BAT adopts a single 3.6V lithium battery.

3. The NB-IoT pressure and temperature monitor according to claim 1, characterized in that: The value of R2 is 300K, the value of R6 is 1M, the value of R7 is 100K, the value of R8 is 2M, the value of R5, R11, R12, R13, R14, R16, R17, R18, and R19 is 10K; the value of C1, C5, C11, C15, C8, C9, C13, and C14 is 100nF; the value of C2 and C3 is 22pF; the value of C10 is 100uF, the value of C12 is 33pF, the value of C7 is 10uF, and the value of E1 is 1000uF.

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