Hydrogen concentration wireless monitoring circuit based on Internet of Things

Abstract

The utility model discloses a hydrogen concentration wireless monitoring circuit based on Internet of Things, which comprises an ESP32 minimum system circuit, a battery power supply module, an interface module, an I2C protocol module, a voltage reading module and a display screen, and the battery power supply module is connected with the ESP32 minimum system circuit; the interface module is connected with an ESP32 minimum system circuit; the I2C protocol module is connected with the ESP32 minimum system circuit; the voltage reading module is connected with the ESP32 minimum system circuit; and the display screen is connected with the ESP32 minimum system circuit. According to the utility model, wireless communication is added, so that relevant data of monitored hydrogen can be visually displayed through the section of a mobile phone end, wireless transmission of the data is realized, and the problem of complicated wiring of a traditional industrial sensor can be solved; the temperature and humidity sensor is added, so that the temperature and humidity in the environment can be monitored in real time, environment sensing and normal-temperature alarm can be realized, the power consumption of the system is reduced, and false alarm and missing alarm of the system in the detection process are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electronic circuit, concretely relates to a hydrogen concentration wireless monitoring circuit based on internet of things. BACKGROUND

[0002] As a new energy, hydrogen has the advantages of high combustion efficiency and non-polluting products, and is called one of the three new energies together with solar energy and nuclear energy. However, hydrogen molecules are small and easy to leak during production, storage, transportation and use. Since hydrogen is colorless and odorless and cannot be detected by the human nose, and has a low ignition point, it can explode when exposed to open flames in an air environment containing 4% to 75% hydrogen. Therefore, in the use of hydrogen, a hydrogen sensor must be used to detect the hydrogen content in the environment and monitor its leakage. As an important gas detection device, the hydrogen sensor plays an important role in ensuring production safety, environmental monitoring, new energy vehicles and home health. However, the current commercial hydrogen sensor either has false positives, false negatives, and precision degradation due to the high-temperature environment required during detection, or has high cost, increased energy consumption, or the disadvantage of non-visual data. For example, the vehicle-mounted hydrogen sensor, although low in cost and fast in response, is low in safety and easily affected by the environment, and has a fire hazard; the infrared sensor, although high in precision and stable, is expensive, complex to maintain, and requires high technology, and is easily affected by environmental factors. Therefore, we propose a wireless monitoring circuit that can monitor hydrogen concentration at room temperature. SUMMARY

[0003] To solve the above problems, the utility model provides a hydrogen concentration wireless monitoring circuit based on internet of things.

[0004] The hydrogen concentration wireless monitoring circuit based on internet of things of the utility model, including: ESP32 minimum system circuit, the ESP32 minimum system circuit includes ESP32 singlechip, battery power module, the battery power module is connected with ESP32 minimum system circuit, interface module, the interface module is connected with ESP32 minimum system circuit, through serial port protocol will the program written well in computer end download and burn to ESP32 singlechip, I 2 C protocol module, the I 2 C protocol module is connected with ESP32 minimum system circuit, I 2 C protocol module includes temperature and humidity sensor and GPS module, voltage reading module, the voltage reading module includes high-precision digital-analog conversion module and INA128 differential proportional operation circuit, the voltage reading module is connected with ESP32 minimum system circuit, display screen, the display screen is connected with ESP32 minimum system circuit, for showing real-time data.

[0005] The battery power module includes a charging and discharging mode and a battery power collection mode, the charging and discharging mode includes an IP5306CK charging and discharging module, a DCDC voltage reduction module and a 3-second power-off module, the IP5306CK charging and discharging module is connected with the ESP32 minimum system circuit through the DCDC voltage reduction module, and the 3-second power-off module is connected with the IP5306CK charging and discharging module and the DCDC voltage reduction module; the battery power collection mode includes a 3-second power-off module and a battery power collection module, the 3-second power-off module is connected with the battery power collection module, and the battery power collection module is connected with the ESP32 minimum system circuit.

[0006] The VBAT end of the IP5306CK charging and discharging module is connected with the VBAT end of the battery holder, the OUT_5V end of the IP5306CK charging and discharging module is connected with the OUT_5V end of the DCDC voltage reduction module, the +3V3 end of the DCDC voltage reduction module is connected with the +3V3 end of the ESP32 minimum system circuit, the DC_SW interface of the DCDC voltage reduction module is connected with the DC_SW interface of the 3-second power-off module, and the VBAT end of the 3-second power-off module is connected with the VBAT end of the IP5306CK charging and discharging module.

[0007] The VBAT end of the battery power collection module is connected with the VBAT end of the 3-second power-off module, and the BAT_ADC interface of the battery power collection module is connected with the BAT_ADC interface of the ESP32 minimum system circuit.

[0008] The interface module includes a TYPE-C interface and a serial port download circuit connected with each other, and the serial port download circuit is connected with the ESP32 minimum system.

[0009] The D+ and D- of the TYPE-C interface are connected with the D+ and D- of the serial port download circuit, and the RXD and TXD of the serial port download circuit are connected with the RXD and TXD of the ESP32 minimum system circuit.

[0010] The temperature and humidity sensor is connected with the SDA and SCL of the ESP32 minimum system circuit through the SDA interface and the SCL interface; the GPS module is an ATGM336H-5N71 GPS module, the SDA interface and the SCL interface of the GPS module are connected with the SDA and SCL of the ESP32 minimum system circuit, and the RXD and TXD of the GPS module are connected with the RXD and TXD of the ESP32 minimum system circuit.

[0011] The high-precision digital-to-analog conversion module and the INA128 differential proportional operation circuit are connected with the ESP32 minimum system circuit, and the INA128 differential proportional operation circuit includes a hydrogen-sensitive material H1, an instrument amplifier and an operational amplifier.

[0012] The high-precision digital-analog conversion module and the INA128 differential proportional operation circuit are connected with the SAD interface in the ESP32 minimum system circuit through the SAD interface.

[0013] The MOSI, SCLK, D / C, RES, TE and CS interfaces in the display screen are connected with the MOSI, SCLK, D / C, RES, TE and CS interfaces in the ESP32 minimum system circuit.

[0014] The ESP32 minimum system of the utility model uses ESP-NOW function to carry out wireless communication, and the related data of hydrogen monitored by the utility model can be intuitively displayed through the mobile phone terminal section, realizes wireless transmission of data, and can solve the problem of complex wiring of traditional industrial sensors; the temperature and humidity sensor can monitor the temperature and humidity in the environment in real time, realizes environmental perception and alarm under normal temperature, reduces system power consumption, and reduces false alarms and missed alarms in the detection process; the IP5306CK charging and discharging module and the battery power acquisition module are arranged, automatic selection of VIN and battery input is realized, so that the power supply line can be intelligently switched; the 1.8-inch screen is further connected, and the visualization of data can be realized; the utility model breaks through the limitation of traditional single-function module by combining wireless communication (ESP32), environmental perception (temperature, humidity and gas) and energy management (charging and discharging), and realizes "sensing-treatment-communication" full-link integration. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the hydrogen concentration wireless monitoring circuit based on the Internet of Things of the utility model.

[0016] Figure 2 It is a TYPE-C interface circuit principle view of the utility model.

[0017] Figure 3 It is an ESP32 minimum system circuit principle view of the utility model.

[0018] Figure 4 It is a circuit principle view of the DCDC voltage reduction module of the utility model.

[0019] Figure 5 It is a circuit principle view of the 3-second on-off module of the utility model.

[0020] Figure 6 It is a principle view of the serial port download circuit of the utility model.

[0021] Figure 7 It is a circuit principle view of the battery power acquisition module of the utility model.

[0022] Figure 8The utility model discloses a circuit principle drawing of IP5306CK charge-discharge module.

[0023] Figure 9 The utility model discloses a circuit principle drawing of 1.8 inch screen.

[0024] Figure 10 The utility model discloses a circuit principle drawing of temperature and humidity sensor.

[0025] Figure 11 The utility model discloses a circuit principle drawing of high-precision digital-analog conversion module.

[0026] Figure 12 The utility model discloses a circuit principle drawing of ATGM336H-5N71 GPS module.

[0027] Figure 13 The utility model discloses a principle drawing of INA128 differential proportional operation circuit. Specific implementation

[0028] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the utility model, and cannot be understood as the limitation of the utility model.

[0029] As Figures 1-13 The utility model discloses a hydrogen concentration wireless monitoring circuit based on internet of things, including: ESP32 minimum system circuit, battery power module, interface module, I 2 C protocol module, voltage reading module and display screen, and the battery power module, interface module, I 2 C protocol module, voltage reading module and display screen are all connected with ESP32 minimum system circuit. ESP32 minimum system circuit includes ESP32 singlechip, and is programmed with aduino software, realizes wireless communication using ESP-NOW function in it, after burning the program written in aduino to ESP32 minimum system, through WIFI module that ESP32 is equipped with, can realize wireless communication between ESP32 singlechip, also can join MQTT protocol and realize wireless communication between ESP32 and mobile phone, and can realize one-to-many communication.

[0030] The battery power module includes a charging and discharging mode and a battery power collection mode, the charging and discharging mode includes an IP5306CK charging and discharging module, a DCDC voltage reduction module and a 3-second power-on and power-off module, the IP5306CK charging and discharging module is connected with the ESP32 minimum system circuit through the DCDC voltage reduction module, and the 3-second power-on and power-off module is connected with the IP5306CK charging and discharging module and the DCDC voltage reduction module; the battery power collection mode includes a 3-second power-on and power-off module and a battery power collection module, the 3-second power-on and power-off module is connected with the battery power collection module, and the battery power collection module is connected with the ESP32 minimum system circuit.

[0031] The VBAT end of the IP5306CK charging and discharging module is connected with the VBAT end of the battery holder, the OUT_5V end of the IP5306CK charging and discharging module is connected with the OUT_5V end of the DCDC voltage reduction module, the +3V3 end of the DCDC voltage reduction module is connected with the +3V3 end of the ESP32 minimum system circuit, the DC_SW interface of the DCDC voltage reduction module is connected with the DC_SW interface of the 3-second power-on and power-off module, and the VBAT end of the 3-second power-on and power-off module is connected with the VBAT end of the IP5306CK charging and discharging module.

[0032] The VBAT end of the battery power collection module is connected with the VBAT end of the 3-second power-on and power-off module, and the BAT_ADC interface of the battery power collection module is connected with the BAT_ADC interface of the ESP32 minimum system circuit.

[0033] The DC_SW is opened, the output voltage is output, the EN enabling interface above is enabled, and the IP5306CK charging and discharging module or the battery power collection module above starts to work.

[0034] The interface module includes a TYPE-C interface and a serial port download circuit connected with each other, and the serial port download circuit is connected with the ESP32 minimum system.

[0035] The D+ and D- of the TYPE-C interface are connected with the D+ and D- of the serial port download circuit, and the RXD and TXD of the serial port download circuit are connected with the RXD and TXD of the ESP32 minimum system circuit.

[0036] I 2The C protocol module is used for communication, including a temperature and humidity sensor and a GPS module. The temperature and humidity sensor is used for detecting the temperature and humidity in the surrounding environment in real time. The temperature and humidity sensor is connected to the SDA and SCL of the ESP32 minimum system circuit through the SDA and SCL interfaces respectively. The GPS module is an ATGM336H-5N71 GPS module. The SDA and SCL interfaces of the GPS module are connected to the SDA and SCL of the ESP32 minimum system circuit respectively. Meanwhile, the RXD and TXD of the GPS module are connected to the RXD and TXD of the ESP32 minimum system circuit.

[0037] The display screen is used for displaying real-time data. The display screen is a 1.8-inch display screen. The MOSI, SCLK, D / C, RES, TE and CS interfaces in the display screen are connected to the MOSI, SCLK, D / C, RES, TE and CS interfaces in the ESP32 minimum system circuit respectively.

[0038] The voltage reading module includes a high-precision digital-to-analog conversion module and an INA128 differential proportional operation circuit, which is used for reading the data of the sensor and more accurately reading or calibrating the voltage signal.

[0039] The high-precision digital-to-analog conversion module and the INA128 differential proportional operation circuit are connected to the ESP32 minimum system circuit. The high-precision digital-to-analog conversion module and the INA128 differential proportional operation circuit are connected to the SAD interface in the ESP32 minimum system circuit through the SAD interface.

[0040] The INA128 differential proportional operation circuit includes a hydrogen-sensitive material H1, an instrument amplifier, an operational amplifier and a buzzer.

[0041] When the hydrogen sensitive material H1 detects the reducing gas, the resistance value thereof is reduced, the positive input end of the instrument amplifier INA128 is connected with the hydrogen sensitive material, the reduction of the resistance value of the hydrogen sensitive material will result in the reduction of the voltage of the positive input end of INA128, the voltage of the output end of INA128 is equal to the difference between the voltage of the positive input end and the voltage of the negative input end multiplied by the gain multiple (the adjustment of the gain multiple is adjusted by the potentiometer PR1), so the voltage of the output end of INA128 will be reduced. Then a voltage sampling point is set at the network tag SAD by using the series resistance voltage division principle, the voltage sampling point is connected with the SAD interface in the ESP32 minimum system circuit, according to the function change curve of the resistance value of the hydrogen sensitive material with the hydrogen concentration measured by experiment, the change of the hydrogen concentration into the change of the resistance value and then into the change of the voltage analog quantity is realized, the voltage value transmitted by operation is directly read by the ESP32 minimum system through the SAD, and then wireless data transmission is carried out by the ESP32 minimum system. The wireless data transmission realizes real-time monitoring of the change of the hydrogen concentration on the mobile terminal or the PC terminal, and greatly improves the ability of danger monitoring and early warning. The output end of INA128 is connected with the positive input end of the operational amplifier LM321, the voltage of the negative input end of LM321 is adjusted by the potentiometer PR3, since the voltage of the output end of INA128 is reduced, that is, the voltage of the positive input end of LM321 is reduced, when the voltage of the positive input end is less than the voltage of the negative input end, LM321 will output the value of the negative power supply voltage, since the negative power supply of LM321 is directly connected with the ground, 0V will be outputted, the light emitting diode and the transistor are turned on, the diode emits light, and the buzzer emits sound to realize alarm. As can be seen from the above, by adjusting the potentiometer PR1 and the potentiometer PR3, the threshold and the sensitivity of the hydrogen alarm can be controlled to adapt to the needs of different application places, and the application range of the hydrogen sensor is greatly widened.

[0042] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electric connection or each other can communicate, can be directly connected, also can be indirectly connected through intermediate medium, can be the communication or mutual action relation of two elements, unless another definite limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0043] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary, and cannot be understood as limiting the utility model, the changes, modifications, replacements and variations of the above embodiments made by ordinary skilled in the art are within the protection scope of the utility model.

Claims

1. An Internet of Things based wireless monitoring circuit for hydrogen concentration, characterized in that, include: The ESP32 minimum system circuit includes an ESP32 microcontroller. A battery power module, which is connected to the ESP32 minimum system circuit; The interface module is connected to the ESP32 minimum system circuit and downloads the program written on the computer to the ESP32 microcontroller via serial port protocol. I 2 C protocol module, the I 2 C protocol module is connected with the ESP32 minimum system circuit, I 2 The C protocol module comprises a temperature and humidity sensor and a GPS module; A voltage reading module, comprising a high-precision digital-to-analog converter module and an INA128 differential proportional operation circuit, wherein the voltage reading module is connected to the ESP32 minimum system circuit; The display screen is connected to the ESP32 minimum system circuit and is used to display real-time data.

2. The IoT-based wireless monitoring circuit for hydrogen concentration as claimed in claim 1 wherein, The battery power module includes a charging / discharging mode and a battery power acquisition mode. The charging / discharging mode includes an IP5306CK charging / discharging module, a DC-DC step-down module, and a 3-second power-on / off module. The IP5306CK charging / discharging module is connected to the ESP32 minimum system circuit through the DC-DC step-down module. The 3-second power-on / off module is connected to both the IP5306CK charging / discharging module and the DC-DC step-down module. The battery power acquisition mode includes a 3-second power-on / off module and a battery power acquisition module. The 3-second power-on / off module is connected to the battery power acquisition module, and the battery power acquisition module is connected to the ESP32 minimum system circuit.

3. The IoT-based wireless monitoring circuit for hydrogen concentration as claimed in claim 2, wherein, The VBAT terminal of the IP5306CK charging and discharging module is connected to the VBAT terminal of the battery holder. The OUT_5V terminal of the IP5306CK charging and discharging module is connected to the OUT_5V terminal of the DC-DC step-down module. The +3V3 terminal of the DC-DC step-down module is connected to the +3V3 terminal of the ESP32 minimum system circuit. The DC_SW interface of the DC-DC step-down module is connected to the DC_SW interface of the 3-second power-on / off circuit. The VBAT terminal of the 3-second power-on / off circuit is connected to the VBAT terminal of the IP5306CK charging and discharging module.

4. The IoT based wireless monitoring circuit for hydrogen concentration as claimed in claim 2 wherein, The VBAT terminal of the battery power acquisition module is connected to the VBAT terminal of the 3-second power-on / off switch, and the BAT_ADC interface of the battery power acquisition module is connected to the BAT_ADC interface of the ESP32 minimum system circuit.

5. The IoT-based wireless monitoring circuit for hydrogen concentration as claimed in claim 1 wherein, The interface module includes an interconnected TYPE-C interface and a serial port download circuit, which is connected to the ESP32 minimum system.

6. The IoT-based wireless monitoring circuit for hydrogen concentration as claimed in claim 5 wherein, The D+ and D- terminals of the TYPE-C interface are connected to the D+ and D- terminals of the serial port download circuit, and the RXD and TXD terminals of the serial port download circuit are connected to the RXD and TXD terminals of the ESP32 minimum system circuit.

7. The IoT-based wireless monitoring circuit for hydrogen concentration as claimed in claim 1 wherein, The temperature and humidity sensor is connected to the SDA and SCL interfaces of the ESP32 minimum system circuit via the SDA and SCL interfaces, respectively. The GPS module is an ATGM336H-5N71 GPS module, with its SDA and SCL interfaces connected to the SDA and SCL interfaces of the ESP32 minimum system circuit, respectively. At the same time, the RXD and TXD interfaces of the GPS module are connected to the RXD and TXD interfaces of the ESP32 minimum system circuit.

8. The IoT-based wireless monitoring circuit for hydrogen concentration as claimed in claim 1 wherein, The high-precision digital-to-analog conversion module and the INA128 differential proportional operation circuit are connected with the ESP32 minimum system circuit, and the INA128 differential proportional operation circuit comprises a hydrogen-sensitive material H1, an instrument amplifier and an operational amplifier.

9. The IoT-based wireless monitoring circuit for hydrogen concentration as claimed in claim 8 wherein, The high-precision digital-to-analog conversion module and the INA128 differential proportional operation circuit are connected with the SAD interface of the ESP32 minimum system circuit.

10. The Internet of Things based wireless monitoring circuit for hydrogen concentration as claimed in claim 1 wherein, The display screen is a 1.8-inch display screen, and the MOSI, SCLK, D / C, RES, TE and CS interfaces in the display screen are connected with the MOSI, SCLK, D / C, RES, TE and CS interfaces in the ESP32 minimum system circuit.

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