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The gas-sensitive material used in the MQ135 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is a polluting gas in the environment, the conductivity in the sensor increases with the concentration of polluted gas in the air. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit.

Specifications:
Size:32* 20* 22mm (L*W*H)
Input voltage: DC5V
Power consumption ( current ): 150mA
DO output: TTL digital 0 and 1 ( 0.1 and 5V)
AO output :0.1-0 .3 V ( relative to pollution ) , the maximum concentration of