Internet-of-things gas detection and control instrument with multi-flashing-light alarm structure

Abstract

The utility model relates to the technical field of gas detection and control instruments, in particular to an internet-of-things gas detection and control instrument with a multi-flashing-light alarm structure, which comprises a main control module, an amplification module, an alarm module and a communication module, and is characterized in that the amplification module comprises a fixed amplification unit, a peak value detection unit, a voltage comparison unit and a controllable amplification unit; the master control module is further used for controlling the amplification factor of the controllable amplification unit, the alarm module comprises a primary alarm unit, a secondary alarm unit and a sound-light alarm unit, and the input ends of the primary alarm unit, the secondary alarm unit and the sound-light alarm unit are respectively connected with different output ports of the master control module. According to the utility model, by changing the amplification times of the controllable amplification unit, the signal can be amplified to a detectable range of the main control module, the signal input with different intensities can be adapted, the use scene can be expanded, a user can be reminded in time through a plurality of alarm modes in the alarm module, remote control can be realized through the communication module, and the user experience is improved. The use is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detectors, in particular to an Internet of Things gas detector with a multi-flash light alarm structure. Background Art

[0002] In modern industrial production, energy development, environmental monitoring and daily life, the detection and monitoring of various gases are crucial. Inflammable, explosive, toxic and harmful gases may exist in different places. For example, in the petrochemical industry, there may be leaks of combustible gases. In mines, the accumulation of harmful gases such as gas may cause major safety accidents. In the home environment, carbon monoxide and natural gas leakage can also pose a serious threat to people's lives and property safety.

[0003] Traditional gas detectors have some limitations, such as a single alarm mode, lack of remote monitoring capabilities and signal adaptation problems. Many traditional gas detectors can only issue alarms locally and cannot achieve remote monitoring and management. This makes it difficult to timely grasp abnormal situations such as gas leaks in unmanned places or large facilities that require centralized management. The measurement signal strengths output by different gas sensors vary, and traditional detectors often find it difficult to adapt to signal inputs of various intensities, which may result in inaccurate measurements or malfunctions. Therefore, a gas detector is needed to make up for the above defects. Summary of the invention

[0004] The purpose of the utility model is to provide an IoT gas detector with a multi-flash light alarm structure to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An Internet of Things gas detector with a multi-flash light alarm structure includes a main control module, an amplification module, an alarm module and a communication module. The amplification module includes a fixed amplification unit, a peak detection unit, a voltage comparison unit and a controllable amplification unit. The input end of the fixed amplification unit is connected to the gas sensor, and the output end of the fixed amplification unit is simultaneously connected to the input ends of the peak detection unit and the controllable amplification unit. The output end of the peak detection unit is connected to the input end of the voltage comparison unit. Two output ends of the voltage comparison unit are connected to different input ports of the main control module. The output end of the controllable amplification unit is connected to the input port of the main control module. The main control module is also used to control the amplification factor of the controllable amplification unit. The alarm module includes a primary alarm unit, a secondary alarm unit and an audible and visual alarm unit. The input ends of the primary alarm unit, the secondary alarm unit and the audible and visual alarm unit are respectively connected to different output ports of the main control module. The main control module and the communication module are signal-connected.

[0007] Preferably, the fixed amplification unit comprises a resistor R1, an operational amplifier U1, a resistor R2 and a resistor R3;

[0008] The first end of the resistor R1 serves as the input end of the fixed amplifying unit, the first end of the resistor R1 is connected to the gas sensor, the second end of the resistor R1 is connected to the in-phase input end of the operational amplifier U1, the first end of the resistor R2 is connected to the output end of the operational amplifier U1, the second end of the resistor R2 is connected to the inverting input end of the operational amplifier U1, the first end of the resistor R3 is connected to the second end of the resistor R2, the second end of the resistor R3 is grounded, and the output end of the operational amplifier U1 serves as the output end of the fixed amplifying unit.

[0009] Preferably, the peak detection unit comprises a diode D1, a capacitor C1 and a resistor R4;

[0010] The anode of the diode D1 serves as the input end of the peak detection unit, the anode of the diode D1 is connected to the output end of the operational amplifier U1, the cathode of the diode D1 serves as the output end of the peak detection unit, the first end of the capacitor C1 is connected to the cathode of the diode D1, the second end of the capacitor C1 is grounded, the first end of the resistor R4 is connected to the first end of the capacitor C1, and the second end of the resistor R4 is grounded.

[0011] Preferably, the voltage comparison unit includes a power supply VCC, a resistor R5, a resistor R6, an operational amplifier U2, a resistor R7, a resistor R8, a resistor R9, an operational amplifier U3 and a resistor R10;

[0012] A first end of the resistor R5 is connected to a power supply VCC, a second end of the resistor R5 is connected to a first end of a resistor R6, a second end of the resistor R6 is grounded, an inverting input end of the operational amplifier U2 is connected to a second end of the resistor R5, an output end of the operational amplifier U2 is connected to a first end of a resistor R7, and a second end of the resistor R7 serves as one of the output ends of the voltage comparison unit;

[0013] The first end of the resistor R8 is connected to the power supply VCC, the second end of the resistor R8 is connected to the first end of the resistor R9, the second end of the resistor R9 is grounded, the inverting input end of the operational amplifier U3 is connected to the second end of the resistor R8, the output end of the operational amplifier U3 is connected to the first end of the resistor R10, and the second end of the resistor R10 serves as another output end of the voltage comparison unit;

[0014] The non-inverting input terminal of the operational amplifier U2 and the non-inverting input terminal of the operational amplifier U3 serve as the input terminal of the voltage comparison unit.

[0015] Preferably, the controllable amplification unit includes a resistor R11, a resistor R12, a resistor R13, an ADG409 chip, a resistor R14, a resistor R15, a resistor R16 and an operational amplifier U4;

[0016] The first ends of resistors R11, R12 and R13 serve as the input end of the controllable amplifying unit, the second ends of resistors R11, R12 and R13 are respectively connected to different input pins of the ADG409 chip, the enable pin of the ADG409 chip is grounded, the two address pins of the ADG409 chip are respectively connected to different output ports of the main control module, the output pin of the ADG409 chip is connected to the first end of resistor R14, the second end of resistor R14 is connected to the in-phase input end of the operational amplifier U4, the first end of resistor R16 is grounded, the second end of resistor R16 is connected to the inverting input end of the operational amplifier U4, the first end of resistor R15 is connected to the inverting input end of the operational amplifier U4, the second end of resistor R15 is connected to the output end of the operational amplifier U4, and the output end of the operational amplifier U4 serves as the output end of the controllable amplifying unit.

[0017] Preferably, the first-level alarm unit includes a resistor R17 and an indicator light L1, a first end of the resistor R17 is connected to an output port of the main control module, a second end of the resistor R17 is connected to a first end of the indicator light L1, and a second end of the indicator light L1 is grounded;

[0018] The secondary alarm unit includes a resistor R18 and an indicator light L2, wherein a first end of the resistor R18 is connected to an output port of the main control module, a second end of the resistor R18 is connected to a first end of the indicator light L2, and a second end of the indicator light L2 is grounded;

[0019] The sound and light alarm unit includes an indicator light L3, a buzzer BL, a resistor R19, a resistor R20 and a transistor Q1, wherein a first terminal of the indicator light L3 is connected to a power supply VCC, a second terminal of the transistor Q1 is connected to a collector of the transistor Q1, a first terminal of the buzzer BL is connected to a power supply VCC, a second terminal of the buzzer BL is connected to a collector of the transistor Q1, an emitter of the transistor Q1 is grounded, a first terminal of the resistor R19 is connected to an output port of the main control module, a second terminal of the resistor R19 is connected to a base of the transistor Q1, a first terminal of the resistor R20 is connected to a base of the transistor Q1, and a second terminal of the resistor R20 is grounded;

[0020] The indicator light L1 , the indicator light L2 , and the indicator light L3 have different colors.

[0021] Preferably, it further comprises a heat dissipation module, wherein the heat dissipation module comprises a motor M, a diode D2, a resistor R21, a resistor R22 and a transistor Q2;

[0022] The first end of the motor M is connected to the power supply VCC, the second end of the motor M is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the anode of the diode D2 is connected to the collector of the diode D2, the cathode of the diode D2 is connected to the power supply VCC, the first end of the resistor R21 is connected to an output port of the main control module, the second end of the resistor R21 is connected to the base of the transistor Q2, the first end of the resistor R22 is connected to the base of the transistor Q2, and the second end of the resistor R22 is grounded.

[0023] Preferably, it further comprises a positioning module, a display module and a storage module, and the positioning module, the display module and the storage module are all connected to the main control module by signal.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The utility model detects the peak value of the signal by setting a peak detection unit, and then determines the peak range through the voltage comparison unit. After the main control module monitors the output of the voltage comparison unit, it changes the amplification factor of the controllable amplification unit so that the signal can be amplified to within the detectable range of the main control module. It can adapt to signal inputs of different intensities to expand the usage scenarios, and can also use a variety of alarm methods in the alarm module to promptly remind the user. Remote control can be achieved through the communication module, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0027] Figure 2 It is a circuit diagram of a fixed amplification unit in the utility model.

[0028] Figure 3 It is a circuit diagram of the peak detection unit in the utility model.

[0029] Figure 4 It is a circuit diagram of the voltage comparison unit in the utility model.

[0030] Figure 5 It is a circuit diagram of the controllable amplification unit in the utility model.

[0031] Figure 6 This is the circuit diagram of the first-level alarm unit in the utility model.

[0032] Figure 7 It is the circuit diagram of the secondary alarm unit in the utility model.

[0033] Figure 8 It is the circuit diagram of the sound and light alarm unit in the utility model.

[0034] Fig. 9 It is a circuit diagram of the heat dissipation module in the utility model.

[0035] In the figure:

[0036] 1. Main control module; 2. Positioning module; 3. Display module;

[0037] 4. Amplification module; 40. Fixed amplification unit; 41. Peak detection unit; 42. Voltage comparison unit; 43. Controllable amplification unit;

[0038] 5. Alarm module; 50. Primary alarm unit; 51. Secondary alarm unit; 52. Sound and light alarm unit;

[0039] 6. Storage module; 7. Heat dissipation module; 8. Communication module. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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] See also Figure 1-Figure 9 , the utility model provides a technical solution:

[0042] The IoT gas detector with a multi-flash light alarm structure includes a main control module 1, an amplification module 4, an alarm module 5 and a communication module 8 The amplification module 4 includes a fixed amplification unit 40, a peak detection unit 41, a voltage comparison unit 42 and a controllable amplification unit 43. The input end of the fixed amplification unit 40 is connected to the gas sensor, and the output end of the fixed amplification unit 40 is connected to the input ends of the peak detection unit 41 and the controllable amplification unit 43 at the same time. The output end of the peak detection unit 41 is connected to the input end of the voltage comparison unit 42. The two output ends of the voltage comparison unit 42 are connected to different input ports of the main control module 1. The output end of the controllable amplification unit 43 is connected to the input port of the main control module 1. The main control module 1 is also used to control the amplification factor of the controllable amplification unit 43. The alarm module 5 includes a primary alarm unit 50, a secondary alarm unit 51 and an audible and visual alarm unit 52. The input ends of the primary alarm unit 50, the secondary alarm unit 51 and the audible and visual alarm unit 52 are respectively connected to different output ports of the main control module 1. The main control module 1 is connected to the communication module 8 by signal. The main control module 1 can use a common single-chip microcomputer, DSP and FPGA. The main control module 1 also needs to have its own analog-to-digital conversion function. The communication module 8 can use 4G or WIFI to achieve remote control.

[0043] In this embodiment, the fixed amplification unit 40 includes a resistor R1, an operational amplifier U1, a resistor R2, and a resistor R3;

[0044] The first end of resistor R1 serves as the input end of the fixed amplifying unit 40, the first end of resistor R1 is connected to the gas sensor, the second end of resistor R1 is connected to the in-phase input end of operational amplifier U1, the first end of resistor R2 is connected to the output end of operational amplifier U1, the second end of resistor R2 is connected to the inverting input end of operational amplifier U1, the first end of resistor R3 is connected to the second end of resistor R2, the second end of resistor R3 is grounded, and the output end of operational amplifier U1 serves as the output end of the fixed amplifying unit 40. The signal transmitted by the gas sensor is usually small, and the fixed amplifying unit 40 can amplify the signal to facilitate the subsequent circuit operation.

[0045] Specifically, the peak detection unit 41 includes a diode D1, a capacitor C1 and a resistor R4, and the capacitor C1 will be charged until the peak value of the signal is reached;

[0046] The anode of the diode D1 serves as the input end of the peak detection unit 41, the anode of the diode D1 is connected to the output end of the operational amplifier U1, the cathode of the diode D1 serves as the output end of the peak detection unit 41, the first end of the capacitor C1 is connected to the cathode of the diode D1, the second end of the capacitor C1 is grounded, the first end of the resistor R4 is connected to the first end of the capacitor C1, and the second end of the resistor R4 is grounded.

[0047] Specifically, the voltage comparison unit 42 includes a power supply VCC, a resistor R5, a resistor R6, an operational amplifier U2, a resistor R7, a resistor R8, a resistor R9, an operational amplifier U3 and a resistor R10, and determines the peak range of the signal by setting two thresholds;

[0048] The first end of the resistor R5 is connected to the power supply VCC, the second end of the resistor R5 is connected to the first end of the resistor R6, the second end of the resistor R6 is grounded, the inverting input end of the operational amplifier U2 is connected to the second end of the resistor R5, the output end of the operational amplifier U2 is connected to the first end of the resistor R7, and the second end of the resistor R7 serves as one of the output ends of the voltage comparison unit 42;

[0049] The first end of the resistor R8 is connected to the power supply VCC, the second end of the resistor R8 is connected to the first end of the resistor R9, the second end of the resistor R9 is grounded, the inverting input end of the operational amplifier U3 is connected to the second end of the resistor R8, the output end of the operational amplifier U3 is connected to the first end of the resistor R10, and the second end of the resistor R10 serves as another output end of the voltage comparison unit 42;

[0050] The non-inverting input terminal of the operational amplifier U2 and the non-inverting input terminal of the operational amplifier U3 serve as the input terminal of the voltage comparison unit 42 .

[0051] Furthermore, the controllable amplification unit 43 includes a resistor R11, a resistor R12, a resistor R13, an ADG409 chip, a resistor R14, a resistor R15, a resistor R16 and an operational amplifier U4, and selects one of the resistors R11, R12 and R13 to be connected to the circuit through the two-bit binary signal output by the main control module 1, thereby changing the amplification factor;

[0052] The first ends of resistors R11, R12 and R13 serve as the input end of the controllable amplifying unit 43, the second ends of resistors R11, R12 and R13 are respectively connected to different input pins of the ADG409 chip, the enable pin of the ADG409 chip is grounded, the two address pins of the ADG409 chip are respectively connected to different output ports of the main control module 1, the output pin of the ADG409 chip is connected to the first end of resistor R14, the second end of resistor R14 is connected to the in-phase input end of the operational amplifier U4, the first end of resistor R16 is grounded, the second end of resistor R16 is connected to the inverting input end of the operational amplifier U4, the first end of resistor R15 is connected to the inverting input end of the operational amplifier U4, the second end of resistor R15 is connected to the output end of the operational amplifier U4, and the output end of the operational amplifier U4 serves as the output end of the controllable amplifying unit 43.

[0053] In addition, the first-level alarm unit 50 includes a resistor R17 and an indicator light L1, wherein a first end of the resistor R17 is connected to an output port of the main control module 1, a second end of the resistor R17 is connected to a first end of the indicator light L1, and a second end of the indicator light L1 is grounded, and a flashing effect is achieved through a PWM signal;

[0054] The secondary alarm unit 51 includes a resistor R18 and an indicator light L2, wherein a first end of the resistor R18 is connected to an output port of the main control module 1, a second end of the resistor R18 is connected to a first end of the indicator light L2, and a second end of the indicator light L2 is grounded, and a flashing effect is also achieved through a PWM signal;

[0055] The sound and light alarm unit 52 includes an indicator light L3, a buzzer BL, a resistor R19, a resistor R20 and a transistor Q1, wherein the first terminal of the indicator light L3 is connected to the power supply VCC, the second terminal of the transistor Q1 is connected to the collector of the transistor Q1, the first terminal of the buzzer BL is connected to the power supply VCC, the second terminal of the buzzer BL is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the first terminal of the resistor R19 is connected to an output port of the main control module 1, the second terminal of the resistor R19 is connected to the base of the transistor Q1, the first terminal of the resistor R20 is connected to the base of the transistor Q1, and the second terminal of the resistor R20 is grounded, so that the reminder effect is better;

[0056] The indicator light L1 , the indicator light L2 , and the indicator light L3 have different colors.

[0057] It is worth noting that a heat dissipation module 7 is also included, and the heat dissipation module 7 includes a motor M, a diode D2, a resistor R21, a resistor R22 and a transistor Q2, so as to dissipate heat in time and ensure normal operation of the device;

[0058] The first end of the motor M is connected to the power supply VCC, the second end of the motor M is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the anode of the diode D2 is connected to the collector of the diode D2, the cathode of the diode D2 is connected to the power supply VCC, the first end of the resistor R21 is connected to an output port of the main control module 1, the second end of the resistor R21 is connected to the base of the transistor Q2, the first end of the resistor R22 is connected to the base of the transistor Q2, and the second end of the resistor R22 is grounded.

[0059] It is worth noting that it also includes a positioning module 2, a display module 3 and a storage module 6. The positioning module 2, the display module 3 and the storage module 6 are all connected to the main control module 1 by signal. The positioning module 2 uses GPS or Beidou, the display module 3 can use a touch screen, and the displayed data includes magnification, measurement data, curve graphs and related parameters. The storage module 6 is used to store historical data.

[0060] When the IoT gas detector with a multi-flash light alarm structure of the utility model is in use, the data signal V1 measured by the gas sensor is transmitted to the fixed amplifier unit 40, the fixed amplifier unit 40 amplifies the signal V1 into a signal V2, the signal V2 charges the capacitor C1 in the peak detection unit 41, and the capacitor C1 outputs a signal V3 after reaching the peak value of the signal V2, and then the range of the signal V3 is determined by the two voltage comparison circuits in the voltage comparison unit 42, and the main control module 1 understands the range of the signal V3 through the two output signals V4 and V5 of the voltage comparison unit 42. For example, if the value of the signal V3 is 0.5V, and the two thresholds in the voltage comparison unit 42 are 0.8V and 0.3V respectively, then the signal V4 and the signal V5 are one high level and the other low level, and the main control module 1 can understand that the signal V3 is within the two threshold ranges, and then The rear main control module 1 changes the switch status in the ADG409 chip by outputting signals V6 and V7, and selects one of the resistors R11, R12 or R13 to connect to the circuit, thereby changing the amplification factor so that the final amplified signal V8 meets the input port requirements of the main control module 1. At this time, the input port needs to have its own analog-to-digital conversion function to expand the scope of application. In addition, the main control module 1 can output a PWM signal to drive the first-level alarm unit 50 and the second-level alarm unit 51. The first-level alarm unit 50, the second-level alarm unit 51 and the sound and light alarm unit 52 correspond to different warning levels, which is convenient for users to use. The heat dissipation module 7 can reduce the temperature to ensure the normal operation of each device. The device location can also be understood through the positioning module 2, the data can be understood through the display module 3, and remote control can be achieved through the communication module 8, which is more practical.

[0061] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An IoT gas detector with a multi-flash light alarm structure, comprising a main control module (1), an amplification module (4), an alarm module (5) and a communication module (8), characterized in that: The amplification module (4) comprises a fixed amplification unit (40), a peak detection unit (41), a voltage comparison unit (42) and a controllable amplification unit (43); the input end of the fixed amplification unit (40) is connected to the gas sensor; the output end of the fixed amplification unit (40) is simultaneously connected to the input ends of the peak detection unit (41) and the controllable amplification unit (43); the output end of the peak detection unit (41) is connected to the input end of the voltage comparison unit (42); and the two output ends of the voltage comparison unit (42) are connected to different input ends of the main control module (1). The output end of the controllable amplifying unit (43) is connected to the input port of the main control module (1); the main control module (1) is also used to control the amplification factor of the controllable amplifying unit (43); the alarm module (5) comprises a primary alarm unit (50), a secondary alarm unit (51) and an audible and visual alarm unit (52); the input ends of the primary alarm unit (50), the secondary alarm unit (51) and the audible and visual alarm unit (52) are respectively connected to different output ports of the main control module (1); and the main control module (1) is signal-connected to the communication module (8).

2. The IoT gas detector with a multi-flash light alarm structure according to claim 1 is characterized in that: The fixed amplification unit (40) comprises a resistor R1, an operational amplifier U1, a resistor R2 and a resistor R3; The first end of the resistor R1 serves as the input end of the fixed amplifying unit (40), the first end of the resistor R1 is connected to the gas sensor, the second end of the resistor R1 is connected to the in-phase input end of the operational amplifier U1, the first end of the resistor R2 is connected to the output end of the operational amplifier U1, the second end of the resistor R2 is connected to the inverting input end of the operational amplifier U1, the first end of the resistor R3 is connected to the second end of the resistor R2, the second end of the resistor R3 is grounded, and the output end of the operational amplifier U1 serves as the output end of the fixed amplifying unit (40).

3. The IoT gas detector with a multi-flash light alarm structure according to claim 2 is characterized in that: The peak detection unit (41) comprises a diode D1, a capacitor C1 and a resistor R4; The anode of the diode D1 serves as the input end of the peak detection unit (41), the anode of the diode D1 is connected to the output end of the operational amplifier U1, the cathode of the diode D1 serves as the output end of the peak detection unit (41), the first end of the capacitor C1 is connected to the cathode of the diode D1, the second end of the capacitor C1 is grounded, the first end of the resistor R4 is connected to the first end of the capacitor C1, and the second end of the resistor R4 is grounded.

4. The IoT gas detector with a multi-flash light alarm structure according to claim 3 is characterized in that: The voltage comparison unit (42) comprises a power supply VCC, a resistor R5, a resistor R6, an operational amplifier U2, a resistor R7, a resistor R8, a resistor R9, an operational amplifier U3 and a resistor R10; The first end of the resistor R5 is connected to the power supply VCC, the second end of the resistor R5 is connected to the first end of the resistor R6, the second end of the resistor R6 is grounded, the inverting input end of the operational amplifier U2 is connected to the second end of the resistor R5, the output end of the operational amplifier U2 is connected to the first end of the resistor R7, and the second end of the resistor R7 serves as one of the output ends of the voltage comparison unit (42); The first end of the resistor R8 is connected to the power supply VCC, the second end of the resistor R8 is connected to the first end of the resistor R9, the second end of the resistor R9 is grounded, the inverting input end of the operational amplifier U3 is connected to the second end of the resistor R8, the output end of the operational amplifier U3 is connected to the first end of the resistor R10, and the second end of the resistor R10 serves as another output end of the voltage comparison unit (42); The non-inverting input terminal of the operational amplifier U2 and the non-inverting input terminal of the operational amplifier U3 serve as input terminals of the voltage comparison unit (42).

5. The IoT gas detector with a multi-flash light alarm structure according to claim 1 is characterized in that: The controllable amplification unit (43) comprises a resistor R11, a resistor R12, a resistor R13, an ADG409 chip, a resistor R14, a resistor R15, a resistor R16 and an operational amplifier U4; The first ends of the resistors R11, R12 and R13 serve as the input ends of the controllable amplifying unit (43); the second ends of the resistors R11, R12 and R13 are respectively connected to different input pins of the ADG409 chip; the enable pin of the ADG409 chip is grounded; the two address pins of the ADG409 chip are respectively connected to different output ports of the main control module (1); the output pin of the ADG409 chip is connected to the first end of the resistor R14; the second end of the resistor R14 is connected to the in-phase input end of the operational amplifier U4; the first end of the resistor R16 is grounded; the second end of the resistor R16 is connected to the inverting input end of the operational amplifier U4; the first end of the resistor R15 is connected to the inverting input end of the operational amplifier U4; the second end of the resistor R15 is connected to the output end of the operational amplifier U4; the output end of the operational amplifier U4 serves as the output end of the controllable amplifying unit (43).

6. The IoT gas detector with a multi-flash light alarm structure according to claim 1 is characterized in that: The first-level alarm unit (50) comprises a resistor R17 and an indicator light L1, wherein a first end of the resistor R17 is connected to an output port of the main control module (1), a second end of the resistor R17 is connected to a first end of the indicator light L1, and a second end of the indicator light L1 is grounded; The secondary alarm unit (51) comprises a resistor R18 and an indicator light L2, wherein a first end of the resistor R18 is connected to an output port of the main control module (1), a second end of the resistor R18 is connected to a first end of the indicator light L2, and a second end of the indicator light L2 is grounded; The sound and light alarm unit (52) comprises an indicator light L3, a buzzer BL, a resistor R19, a resistor R20 and a transistor Q1, wherein a first end of the indicator light L3 is connected to a power source VCC, a second end of the transistor Q1 is connected to a collector of the transistor Q1, a first end of the buzzer BL is connected to a power source VCC, a second end of the buzzer BL is connected to a collector of the transistor Q1, an emitter of the transistor Q1 is grounded, a first end of the resistor R19 is connected to an output port of the main control module (1), a second end of the resistor R19 is connected to a base of the transistor Q1, a first end of the resistor R20 is connected to a base of the transistor Q1, and a second end of the resistor R20 is grounded; The indicator light L1 , the indicator light L2 , and the indicator light L3 have different colors.

7. The IoT gas detector with a multi-flashing light alarm structure according to claim 1 is characterized in that: It also includes a heat dissipation module (7), wherein the heat dissipation module (7) includes a motor M, a diode D2, a resistor R21, a resistor R22, and a transistor Q2; The first end of the motor M is connected to the power supply VCC, the second end of the motor M is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the anode of the diode D2 is connected to the collector of the diode D2, the cathode of the diode D2 is connected to the power supply VCC, the first end of the resistor R21 is connected to an output port of the main control module (1), the second end of the resistor R21 is connected to the base of the transistor Q2, the first end of the resistor R22 is connected to the base of the transistor Q2, and the second end of the resistor R22 is grounded.

8. The IoT gas detector with a multi-flash light alarm structure according to claim 1 is characterized in that: It also comprises a positioning module (2), a display module (3) and a storage module (6), wherein the positioning module (2), the display module (3) and the storage module (6) are all connected to the main control module (1) by signals.

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