Description
VCC: positive (5 v)
GND: connect power negative
DO: TTL switch signal output
AO: analog signal output
Special remind: The sensor eed to preheat about 20s after the power supply, and the measured data of sensor will be stable.
The sensor fever belongs to the normal phenomenon,because its internal have heating wire, if too hot is not normal.
Packing inclued : total 9 pcs
MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 MQ-135
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