Tunnel environment monitoring device for experiment teaching

Abstract

The utility model provides a tunnel environment monitoring device for experiment teaching. The tunnel environment monitoring device comprises a simulation sand table, a simulation tunnel, a master control module, an LCD screen, an environment monitoring sensor module, an exhaust fan and an upper computer. The main control module comprises a processor, a WIFI module and a buzzer and is arranged at the bottom of the simulation tunnel; the environment monitoring sensor module is installed on the inner lower wall of the simulation tunnel and is connected with the main control module. The control module adopts a GD32F103ZET6 processor as a core processing unit and is responsible for coordinating the work of each sensor module, processing collected data, sending data to an upper computer through a WIFI module and displaying tunnel environment data in real time through an LCD screen, so that the tunnel environment monitoring system model can be adjusted according to teaching requirements and the size of a simulation sand table, and the teaching efficiency is improved. Students can understand and simulate the working mode of a real tunnel environment monitoring system, and enough flexibility is maintained, so that the tunnel environment monitoring system can be used in different types of sand tables.

Description

Technical Field

[0001] The utility model relates to the field of teaching experimental devices, and more specifically, to a tunnel environment monitoring device used for experimental teaching. Background Art

[0002] At present, the existing tunnel environment monitoring devices in China mainly use actual traffic, which has the following shortcomings:

[0003] (1) Lack of flexibility: Once sensors are installed, it becomes quite difficult to move them to adapt to different monitoring needs, which is not ideal for temporary detection or special event response.

[0004] (2) High installation cost: Deploying traditional fixed sensor systems requires a large amount of hardware equipment and wiring work, which makes the initial installation cost high.

[0005] (3) Poor scalability: As tunnel usage changes, it may be necessary to add or reconfigure sensors, but traditional fixed systems are difficult to flexibly adjust.

[0006] In addition, there are no tunnel environment monitoring related products in the field of traffic simulation experimental teaching, which cannot meet the teaching needs of schools. Due to the above shortcomings, it occupies a large space, has no teaching effect, and is not conducive to students learning its working principle. Therefore, a tunnel environment monitoring device for experimental teaching is particularly important. Utility Model Content

[0007] In view of the above technical problems existing in the application of tunnel environment monitoring in simulation sandbox, the purpose of the utility model is to provide a tunnel environment monitoring device for experimental teaching, which can allow students to understand in detail the important role of tunnel environment monitoring in road traffic.

[0008] The technical solution adopted by the utility model is:

[0009] A tunnel environment monitoring device for experimental teaching, comprising a simulation sandbox, a simulation tunnel, a main control module, an LCD screen, an environment monitoring sensor module, an exhaust fan and a host computer;

[0010] The simulated tunnel is fixedly placed on the road of the simulated sandbox; the main control module includes a processor, a WI FI module and a buzzer, the WI FI module and the buzzer are electrically connected to the processor, and the main control module is arranged at the bottom of the simulated tunnel;

[0011] The environmental monitoring sensor module is installed on the lower part of the inner wall of the simulation tunnel and is connected to the main control module; the exhaust fan is installed on the upper part of the inner wall of the simulation tunnel and is connected to the main control module.

[0012] In the tunnel environment monitoring device for experimental teaching, the environment monitoring sensor module includes a temperature and humidity sensor module, a smoke and gas sensitive sensor module, a carbon monoxide sensor module and an air quality detection sensor module, and the environment monitoring sensor module includes a temperature and humidity sensor module, a smoke and gas sensitive sensor module, a carbon monoxide sensor module and an air quality detection sensor module, which are all electrically connected to the main control module.

[0013] In the tunnel environment monitoring device for experimental teaching, the main control module also includes a temperature and humidity sensor module interface, a smoke and gas sensitive sensor module interface, a carbon monoxide sensor module interface, an air quality detection sensor module interface, an LCD screen interface, an exhaust fan interface and a power supply interface, and the temperature and humidity sensor module interface, the smoke and gas sensitive sensor module interface, the carbon monoxide sensor module interface, the air quality detection sensor module interface, the LCD screen interface, the exhaust fan interface and the power supply interface are all connected to the processor.

[0014] In the tunnel environment monitoring device for experimental teaching, the LCD screen is installed on the vertical column of the signal light pole beside the simulation sand table road, and the host computer is placed on the computer position beside the simulation sand table road.

[0015] In the tunnel environment monitoring device for experimental teaching, the temperature and humidity sensor module is connected to the processor through the temperature and humidity sensor module interface, the smoke and gas sensor module is connected to the processor through the smoke and gas sensor module interface, the carbon monoxide sensor module is connected to the processor through the carbon monoxide sensor module interface, and the air quality detection sensor module is connected to the processor through the air quality detection sensor module interface.

[0016] In the tunnel environment monitoring device for experimental teaching, the WI FI module includes a WI FI chip, the RXD pin of the WI FI chip is connected to the PA2 end of the processor, and the TXD pin of the WI FI chip is connected to the PA3 end of the processor.

[0017] In the tunnel environment monitoring device for experimental teaching, the second pin of the temperature and humidity sensor module interface is connected to the PE5 end of the processor, the AOUT pin of the smoke and gas sensor module interface is connected to the PC3 end of the processor, the AOUT pin of the carbon monoxide sensor module interface is connected to the PC4 end of the processor, and the AOUT pin of the air quality detection sensor module interface is connected to the PC2 end of the processor.

[0018] In the tunnel environment monitoring device for experimental teaching, the simulated tunnel is a PVC simulated tunnel.

[0019] In the tunnel environment monitoring device for experimental teaching, the smoke gas sensor module includes an MQ-2 smoke gas sensor, an operational amplifier, a first resistor, a second resistor, a third resistor, a variable resistor, an LED lamp and a capacitor. The 5th pin of the MQ-2 smoke gas sensor is grounded through the first resistor, the 4th pin and the 6th pin of the MQ-2 smoke gas sensor are connected to the inverting input terminal of the operational amplifier and are also grounded through the second resistor, the non-inverting input terminal of the operational amplifier is connected to the active end of the variable resistor, the first fixed end of the variable resistor is connected to the VCC power supply terminal, the second fixed end of the variable resistor is grounded, the output end of the operational amplifier is connected to the DOUT pin of the smoke gas sensor module interface and is also grounded through the capacitor, the power supply end of the operational amplifier is connected to the VCC power supply terminal and is also connected to the positive pole of the LED lamp through the third resistor, and the negative pole of the LED lamp is connected to the output end of the operational amplifier.

[0020] In the tunnel environment monitoring device for experimental teaching, the carbon monoxide sensor module and the air quality detection sensor module are the same as the smoke gas sensor module.

[0021] Compared with the prior art, the control module of the utility model adopts the GD32F103ZET6 processor as the core processing unit, which is responsible for coordinating the work of each sensor module, processing the collected data, and sending the data to the upper computer through the WIFI module. The LCD screen displays the tunnel environment data in real time. The technical features of the utility model are as follows:

[0022] 1. Model applicability and scalability

[0023] The utility model is a tunnel environment monitoring system model that can be adjusted according to teaching needs and sandbox size, maintaining the working principles and key characteristics of the actual monitoring system. The model enables students to understand and simulate the working mode of the real tunnel environment monitoring system, while maintaining sufficient flexibility for use in different types of sandboxes.

[0024] 2. Simulation data generation and transmission

[0025] The utility model can simulate and generate environmental monitoring data, and transmit the data to the control console operated by the students through the small wireless transmission device in the sandbox. This simulated data generation and transmission function helps students understand the importance of wireless data transmission and environmental monitoring data.

[0026] 3. Interactive User Interface

[0027] The utility model provides an interactive user interface that enables students to view simulation data in real time and understand how to analyze the data to evaluate the tunnel environment. The interactive interface enhances students' sense of participation and learning experience, allowing students to intuitively grasp the concept of environmental monitoring.

[0028] 4. Modular sensor design

[0029] The utility model adopts a modular design of sensor, which enables students to easily add, remove or replace sensor modules according to experimental needs. The modular design is not only convenient for maintenance and upgrading, but also allows students to practice the role of different sensors in environmental monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a tunnel environment monitoring device for experimental teaching provided by the utility model.

[0031] Figure 2 The utility model provides a block diagram of a tunnel environment monitoring device for experimental teaching.

[0032] Figure 3 This is a circuit diagram of the processor U3A of the tunnel environment monitoring device for experimental teaching provided by the utility model.

[0033] Figure 4 This is a circuit diagram of the processor U3B of the tunnel environment monitoring device for experimental teaching provided by the utility model.

[0034] Figure 5 The utility model provides a circuit diagram of a WI FI module of a tunnel environment monitoring device for experimental teaching.

[0035] Figure 6 The utility model provides a circuit diagram of a temperature and humidity sensor module for a tunnel environment monitoring device for experimental teaching.

[0036] Figure 7 The utility model provides a circuit diagram of a smoke and gas sensor module for a tunnel environment monitoring device for experimental teaching.

[0037] Figure 8 The utility model provides a circuit diagram of a carbon monoxide sensor module of a tunnel environment monitoring device for experimental teaching.

[0038] Fig. 9 The utility model provides a circuit diagram of an air quality detection sensor module of a tunnel environment monitoring device for experimental teaching.

[0039] Wherein: main control module 1, processor 101, WIFI module 102, LCD screen interface 103, temperature and humidity sensor module interface 104, smoke gas sensor module interface 105, carbon monoxide sensor module interface 106, air quality detection sensor module interface 107, power interface 108, buzzer 109, exhaust fan 110, simulation tunnel 2, LCD screen 3, sensor module 4, temperature and humidity sensor module 401, smoke gas sensor module 402, carbon monoxide sensor module 403, air quality detection sensor module 404, exhaust fan 5, host computer 6, simulation sandbox 7, WIFI chip U1, MQ-2 smoke gas sensor Y1, operational amplifier U2, first resistor R1, second resistor R2, third resistor R3, variable resistor RP, LED lamp D1, capacitor C1. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and are only used for illustrative purposes and cannot be understood as limitations on this patent. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] The utility model provides a tunnel environment monitoring device for experimental teaching, including a simulation sandbox, a simulation tunnel, a main control module, an LCD screen, an environment monitoring sensor module, an exhaust fan and a host computer; the main control module includes a processor, a WIFI network communication module, and a buzzer, and is arranged at the bottom of the simulation tunnel; the environment monitoring sensor module is installed on the lower wall of the simulation tunnel and connected to the main control module. The control module of the utility model adopts the GD32F103ZET6 processor as the core processing unit, which is responsible for coordinating the work of each sensor module, processing the collected data, and sending data to the host computer through the WIFI network communication module. The LCD screen displays the tunnel environment data in real time. The tunnel environment monitoring system model can be adjusted according to teaching needs and the size of the simulation sandbox, and the working principle and key characteristics of the actual monitoring system are maintained. It enables students to understand and simulate the working mode of the real tunnel environment monitoring system, while maintaining sufficient flexibility for use in different types of sandboxes.

[0042] See also Figure 1 and Figure 2 An embodiment of the utility model provides a tunnel environment monitoring device for experimental teaching, including a simulation sandbox 7, a simulation tunnel 2, a main control module 1, an LCD screen 3, an environment monitoring sensor module 4, an exhaust fan 5 and a host computer 6.

[0043] The simulation tunnel 2 is fixed on the road of the simulation sandbox 7; the main control module 1 is arranged at the bottom of the simulation tunnel 2, and includes a processor 101, a WIFI module 102 and a buzzer 109; the WIFI module 102 and the buzzer 109 are connected to the processor 101.

[0044] The environmental monitoring sensor module 4 is installed on the lower inner wall of the simulated tunnel 2, that is, the lower part or the lower middle part of the inner wall of the simulated tunnel 2, and is connected to the main control module 1; the exhaust fan 110 is installed on the upper inner wall of the simulated tunnel 2, that is, the upper part or the top of the inner wall of the simulated tunnel 2, and is connected to the main control module 1.

[0045] The environmental monitoring sensor module 4 includes a temperature and humidity sensor module 401, a smoke and gas sensitive sensor module 402, a carbon monoxide sensor module 403 and an air quality detection sensor module 404, and the environmental monitoring sensor module includes a temperature and humidity sensor module 401, a smoke and gas sensitive sensor module 402, a carbon monoxide sensor module 403 and an air quality detection sensor module 404, which are all electrically connected to the main control module 1.

[0046] The main control module 1 also includes a temperature and humidity sensor module interface 104, a smoke and gas sensor module interface 105, a carbon monoxide sensor module interface 106, an air quality detection sensor module interface 107, an LCD screen interface 103, an exhaust fan interface 110 and a power supply interface 108. The temperature and humidity sensor module interface, the smoke and gas sensor module interface, the carbon monoxide sensor module interface, the air quality detection sensor module interface, the LCD screen interface, the exhaust fan interface and the power supply interface are all connected to the processor.

[0047] The utility model uses a pluggable connection with the processor through an interface, so that the sensor module adopts a modular design sensor, so that students can easily add, remove or replace the sensor module according to the experimental needs. The modular design is not only convenient for maintenance and upgrading, but also allows students to practice the role of different sensors in environmental monitoring.

[0048] The LCD screen 3 adopts a touch screen for human-computer interaction, which is installed on the vertical column of the signal light pole beside the road of the simulation sand table 7, and the host computer is placed on the computer position beside the road of the simulation sand table.

[0049] The Wi-Fi module 102 is connected to the main control module 1 and allows wireless transmission of data to the host computer 6 to achieve remote monitoring and data management. The LCD screen 3 is connected to the main control module 1 through the LCD screen interface 103, and is used to display environmental monitoring data in real time and provide intuitive on-site information feedback. The temperature and humidity sensor module 401 is a DHT11 temperature and humidity sensor module, which is connected to the processor 101 through the temperature and humidity sensor module interface 104 and is used to measure the relative humidity and temperature of the environment.

[0050] The smoke gas sensor module 402 is connected to the processor 101 through the smoke gas sensor module interface 105, and is used to detect the smoke concentration in the environment. The carbon monoxide sensor module 403 is connected to the processor 101 through the carbon monoxide sensor module interface 106, and is used to detect the carbon monoxide concentration in the environment. The air quality detection sensor module 404 is connected to the processor 101 through the air quality detection sensor module interface 107, and is used to evaluate the air quality in the environment. The data collected by all sensor modules are transmitted to the processor 101 of the main control module 1 through their respective interfaces, and after being uniformly processed by the main control module 1, they are sent to the host computer 6 through the WIFI module 102, and the exhaust fan 5 is connected to the exhaust fan interface 110. When abnormal, the host computer 6 will alarm. The host computer 6 runs the corresponding software, establishes a connection with the environmental monitoring sensor module 4 through the WI FI module 102, receives the environmental monitoring data from the device, and displays, records and analyzes it. The power supply of the entire system is provided by the power supply interface 108 connected to the external power supply to ensure the stable operation of all components.

[0051] See also Figures 3 to 9 The WIFI module 102 includes a WIFI chip U1, the RXD pin of the WIFI chip U1 is connected to the PA2 terminal of the processor 101, the TXD pin of the WIFI chip U1 is connected to the PA3 terminal of the processor 101, communicates with the microcontroller, and allows wireless transmission of data to the host computer to achieve remote monitoring and data management.

[0052] Please also read Figures 3 to 9 The second pin of the temperature and humidity sensor module interface 104 is connected to the PE5 terminal of the processor 101, the AOUT pin of the smoke and gas sensor module interface 105 is connected to the PC3 terminal of the processor 101, the AOUT pin of the carbon monoxide sensor module interface 106 is connected to the PC4 terminal of the processor 101, and the AOUT pin of the air quality detection sensor module interface 107 is connected to the PC2 terminal of the processor 101.

[0053] See also Figure 1 and 2When the power interface 108 of the utility model is powered on and started, the main control module 1 initializes all sensors of the environmental monitoring sensor module 4 and the WIFI module 2. The temperature and humidity sensor module 401, the smoke and gas sensor module 402, the carbon monoxide sensor module 403 and the air quality detection sensor 404 module regularly collect environmental data. The main control module 1 collects the data of each sensor and sends it to the host computer 6 through the WIFI module 102. The host computer 6 receives the data, analyzes and processes it, and sends control instructions to the main control module 1 when necessary. The main control module 1 adjusts the working state or acquisition frequency of the sensor according to the instructions of the host computer 6. The LCD screen 3 displays the environmental data in real time for on-site personnel to monitor. When the environmental monitoring sensor module 4 detects an abnormal situation, the main control module 1 will immediately send an alarm signal to the host computer 6 through the WIFI module 2, and the buzzer 109 will sound an alarm, the exhaust fan 5 will open to remove toxic gases, and the preset emergency response measures can be triggered.

[0054] In an optional embodiment, the processor 101 may use microcontrollers U3A and U3B of model GD32F103ZET6 (the utility model is through Figure 3 and Figure 4 The utility model adopts GD32F103ZET6 microcontroller as the core processing unit, which is responsible for coordinating the work of each sensor module, processing the collected data, and sending data to the host computer through the WIFI module. The LCD screen displays the tunnel environment data in real time, with fast processing speed, intuitive display, and convenient teaching use.

[0055] The smoke gas sensor module 402 is an MQ-2 smoke gas sensor module, which includes an MQ-2 smoke gas sensor Y1, an operational amplifier U2, a first resistor R1, a second resistor R2, a third resistor R3, a variable resistor RP, an LED lamp D1 and a capacitor C1. The 5th pin of the MQ-2 smoke gas sensor is grounded through the first resistor R1, the 4th pin and the 6th pin of the MQ-2 smoke gas sensor are connected to the inverting input terminal of the operational amplifier U2 and are also grounded through the second resistor R2, the non-inverting input terminal of the operational amplifier U2 is connected to the active end of the variable resistor RP, the first fixed end of the variable resistor RP is connected to the VCC power supply terminal, the second fixed end of the variable resistor RP is grounded, the output end of the operational amplifier U2 is connected to the DOUT pin of the smoke gas sensor module interface 105 and is also grounded through the capacitor, the power supply end of the operational amplifier U2 is connected to the VCC power supply terminal and is also connected to the positive electrode of the LED lamp D1 through the third resistor R3, and the negative electrode of the LED lamp D1 is connected to the output end of the operational amplifier U2.

[0056] When the smoke concentration in the tunnel reaches a certain value, the MQ-2 smoke gas sensor Y1 detects the smoke and converts it into a voltage signal, which is amplified by the operational amplifier U2, filtered by the capacitor C1, and sent to the processor 101 through the smoke gas sensor module interface 105. The processor 101 starts the exhaust fan to open and exhaust the toxic gas, and can trigger the preset emergency response measures. At the same time, the LED light D1 lights up, indicating that the smoke concentration exceeds the standard. The variable resistor can adjust the sensitivity of the MQ-2 smoke gas sensor Y1 according to the actual situation.

[0057] The carbon monoxide sensor module 403 is an MQ-7 carbon monoxide sensor module, which can use the same circuit as the smoke gas sensor module 402. The air quality detection sensor module 404 is an MQ135 air quality detection sensor module, which includes an MQ135 air quality detection sensor and its peripheral circuit, which can also use the same circuit as the smoke gas sensor module 402. Since the smoke gas sensor module 402 has been described in detail above, it will not be repeated here.

[0058] In summary, the beneficial effects of the technical solution of the utility model are:

[0059] 1. Enhance teaching interactivity

[0060] The utility model enables students to intuitively observe and analyze tunnel environment changes through real-time data simulation and interactive user interface, thereby enhancing student participation and teaching interactivity.

[0061] 2. Improve learning experience

[0062] With the help of simulated data generation and transmission, students can operate in a similar real working environment, which helps to enhance students' learning experience and enable them to better understand the connection between theoretical knowledge and practical applications.

[0063] 3. Strengthen practical skills

[0064] Through modular sensor design and simple operation procedures, students can build, debug and maintain the equipment by themselves, which enhances their practical skills and stimulates innovative thinking.

[0065] 4. Promote knowledge understanding

[0066] The educational guidance function and experimental prompts provided by the utility model help students understand complex concepts, so that students can learn data analysis and problem solving while mastering tunnel environment monitoring technology.

[0067] 5. Flexible teaching applications

[0068] The scalability and model applicability of the utility model enable it to adapt to sandboxes of different sizes and types, providing teachers with a flexible teaching tool suitable for a variety of teaching scenarios and course designs.

[0069] 6. Reduce teaching costs

[0070] Compared with building a real tunnel environment monitoring system, the sandbox simulation system reduces the costs brought by actual equipment and safety risks, making teaching more economical and efficient.

[0071] 7. Enhance the integration of theory and practice

[0072] By simulating real-world tunnel environment monitoring on a sandbox, students can combine abstract theoretical knowledge with specific practical operations to enhance their in-depth understanding of knowledge and their ability to apply it.

[0073] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A tunnel environment monitoring device for experimental teaching, characterized in that: Including simulation sandbox, simulation tunnel, main control module, LCD screen, environmental monitoring sensor module, exhaust fan and host computer; The simulated tunnel is fixedly placed on the road of the simulated sandbox; the main control module includes a processor, a WIFI module and a buzzer, the WIFI module and the buzzer are electrically connected to the processor, and the main control module is arranged at the bottom of the simulated tunnel; The environmental monitoring sensor module is installed on the lower part of the inner wall of the simulation tunnel and is connected to the main control module; the exhaust fan is installed on the upper part of the inner wall of the simulation tunnel and is connected to the main control module.

2. The tunnel environment monitoring device for experimental teaching according to claim 1 is characterized in that: The environmental monitoring sensor module includes a temperature and humidity sensor module, a smoke and gas sensitive sensor module, a carbon monoxide sensor module and an air quality detection sensor module, and the environmental monitoring sensor module includes a temperature and humidity sensor module, a smoke and gas sensitive sensor module, a carbon monoxide sensor module and an air quality detection sensor module, which are all electrically connected to the main control module.

3. The tunnel environment monitoring device for experimental teaching according to claim 2 is characterized in that: The main control module also includes a temperature and humidity sensor module interface, a smoke and gas sensor module interface, a carbon monoxide sensor module interface, an air quality detection sensor module interface, an LCD screen interface, an exhaust fan interface and a power supply interface, and the temperature and humidity sensor module interface, the smoke and gas sensor module interface, the carbon monoxide sensor module interface, the air quality detection sensor module interface, the LCD screen interface, the exhaust fan interface and the power supply interface are all connected to the processor.

4. The tunnel environment monitoring device for experimental teaching according to claim 1 is characterized in that: The LCD screen is installed on the vertical column of the signal light pole beside the simulation sand table road, and the host computer is placed on the computer position beside the simulation sand table road.

5. The tunnel environment monitoring device for experimental teaching according to claim 3 is characterized in that: The temperature and humidity sensor module is connected to the processor via the temperature and humidity sensor module interface, the smoke and gas sensor module is connected to the processor via the smoke and gas sensor module interface, the carbon monoxide sensor module is connected to the processor via the carbon monoxide sensor module interface, and the air quality detection sensor module is connected to the processor via the air quality detection sensor module interface.

6. The tunnel environment monitoring device for experimental teaching according to claim 1 is characterized in that: The WIFI module includes a WIFI chip, the RXD pin of the WIFI chip is connected to the PA2 terminal of the processor, and the TXD pin of the WIFI chip is connected to the PA3 terminal of the processor.

7. The tunnel environment monitoring device for experimental teaching according to claim 5 is characterized in that: The second pin of the temperature and humidity sensor module interface is connected to the PE5 end of the processor, the AOUT pin of the smoke and gas sensor module interface is connected to the PC3 end of the processor, the AOUT pin of the carbon monoxide sensor module interface is connected to the PC4 end of the processor, and the AOUT pin of the air quality detection sensor module interface is connected to the PC2 end of the processor.

8. The tunnel environment monitoring device for experimental teaching according to claim 7 is characterized in that: The simulated tunnel is a PVC simulated tunnel.

9. The tunnel environment monitoring device for experimental teaching according to claim 3 is characterized in that: The smoke and gas sensor module includes an MQ-2 smoke and gas sensor, an operational amplifier, a first resistor, a second resistor, a third resistor, a variable resistor, an LED lamp and a capacitor. The 5th pin of the MQ-2 smoke and gas sensor is grounded through the first resistor, the 4th pin and the 6th pin of the MQ-2 smoke and gas sensor are connected to the inverting input terminal of the operational amplifier and are also grounded through the second resistor, the non-inverting input terminal of the operational amplifier is connected to the active end of the variable resistor, the first fixed end of the variable resistor is connected to the VCC power supply terminal, the second fixed end of the variable resistor is grounded, the output end of the operational amplifier is connected to the DOUT pin of the smoke and gas sensor module interface and is also grounded through the capacitor, the power supply end of the operational amplifier is connected to the VCC power supply terminal and is also connected to the positive pole of the LED lamp through the third resistor, and the negative pole of the LED lamp is connected to the output end of the operational amplifier.

10. The tunnel environment monitoring device for experimental teaching according to claim 9, characterized in that: The carbon monoxide sensor module and the air quality detection sensor module are the same as the smoke gas sensor module.

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