Function introduction

Module principle: The gas-sensitive material used by the MQ-2 gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. When there is a combustible gas in the environment of the sensor, the conductivity of the sensor increases with the increase of the combustible gas concentration in the air. A simple circuit can be used to convert the change in conductivity into an output signal corresponding to the concentration of that gas. The MQ-2 gas sensor is highly sensitive to liquefied gas, propane and hydrogen, and is ideal for the detection of natural gas and other combustible vapors.

Operating voltage: DC5.0V

Output digital signal: TTL high 5V, low 0V

Output analog signal: The higher the 0-5V concentration, the higher the output voltage

Application: single-chip microcomputer control environmental parameter detection, liquefied gas, natural gas, city gas and other electronic design

Dimensions: 30x20x1.6mm

Shipping list: MQ2 Smoke Sensor Module *1

Wiring: VCC: Connect DC5.0V power supply to the positive terminal (supply power to the sensor)

GND: connects to the negative terminal of the power supply

DO: digital signal output, connected to the MCU

AO: analog signal output, AD detects input pins