Combustible Gas and Cigarette Smoke Sensor - MQ-2

MQ-2 gas sensor is a gas sensor that can detect flammable and cigarette smoke in the environment. It gives an analog output according to the gas density in the environment. Smoke detection range is 300 – 10000 ppm.

There are A,B,H pins on the sensor. The sensor can be operated by applying the connection diagram below. Sensitivity can be changed by changing the connected resistor value.