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The MQ-6 is a simple-to-use liquefied petroleum gas (LPG) sensor. It can be used in gas leakage detecting equipment in consumer and industry applications,this sensor is suitable for detecting LPG, iso-butane, propane, LNG. Avoid the noise of alcohol, cooking fumes and cigarette smoke. The sensitivity can be adjusted by the potentiometer.
the MQ-6 has four output pins: A0, D0, GND and VCC. A0 gives out varying voltages corresponding to the level of LPG in the air. D0 goes high when a certain threshold is reached. Otherwise, it stays low. The threshold can be varied by adjusting the trimmer on the board