MQ2 smoke combustible gas sensor can detect the presence of combustible gas concentration in the air. And in the form of analog voltage output. The sensor can measure concentration in 300 ~ 10000 PPM concentration of combustible gas. The operating temperature range of - 20 to 50 degrees. Only need to use 5 v, power consumption of less than 150 ma. Feet (H) through the pipe connected to 5 v voltage enough heat can guarantee the normal work of the sensor. Connect 5 v voltage to pin A or B, make the sensor can launch A virtual voltage to other pins. Between the output pin and ground to take over the foot of the electric load is made up of a detector Lin negative group. Note: the data sheet in the distribution of the top picture is not correct. All distribution in line with the underlying distribution of the output pin. Negative set of electric load and your application (using the data code) in the manual calibration. However, the starting value of 20 k Ω best resistance.
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