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Introduction to MQ-5 Sensor:

The gas sensing material used in MQ-5 gas sensors is tin dioxide (SnO2) with low conductivity in clean air. When there is combustible gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of combustible gas concentration in the air. The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit. The MQ-5 gas sensor has high sensitivity to butane, propane, and methane, and can achieve a good balance between methane and propane. This sensor can detect various flammable gases, especially natural gas, and is a low-cost sensor suitable for multiple applications.

See module application

Suitable for monitoring liquefied gas, natural gas, and coal gas in households or industries. Excellent resistance to ethanol and smoke interference.

Module features

1. Adopting high-quality dual panel design, with power indication and TTL signal output indication;

2. Equipped with DO switch signal (TTL) output and AO analog signal output;

3. TTL outputs a valid signal at a low level. When the signal light is on when the output is low, it can be directly connected to a microcontroller or relay module

4. The voltage of analog output increases with higher concentration.

5. Has good sensitivity for gas and natural gas detection.

6. There are four screw holes for easy positioning;

7. Product dimensions: 32 (L) * 20 (W) * 22 (H)

8. Long term service life and reliable stability

9. Quick response and recovery features

Electrical performance

Input voltage: DC5V Power consumption (current): 150mA

DO output: TTL digital quantities 0 and 1 (0.1 and 5V)

AO output: 0.1-0.3V (relatively pollution-free), concentration voltage around 4V

Special reminder: After the sensor is powered on, it needs to be preheated for about 20 seconds for the measured data to stabilize. Sensor heating is a normal phenomenon because there are electric heating wires inside. If it is hot, it is not normal.

Test program

Implementation function: This version comes with a supporting testing program

Using chip: AT89S52

Crystal oscillator: 11.0592MHz

Baud rate: 9600

Compilation environment: Keil

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