Re: MQ2 Combustible Gas sensor circuit
Read the datasheet:
The sensor need to be put 2 voltage:
heater voltage（VH） and test voltage（VC）.
VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance （RL）whom is in series with sensor. The sensor has light polarity, Vc need DC
power. VC and VH could use same power circuit with precondition to assure performance of sensor. In order to make the sensor with better performance,
suitable RL value is needed: Power of Sensitivity body(Ps):
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