MQ3 Gas Sensor Break Out Board With signal output instructions has Two-way signal output (TTL level output and analog output). TTL output effectively signals for low level(when the output low level signal lights, can directly connected microcomputer).Analog output is 0 ~ 5v voltage, the higher the concentration, the higher the voltage. It Has a high sensitivity and good selectivity. Mainly used For motor vehicles and other prohibition drunken drivers homework personnel on-site testing, also used in other places of ethanol vapor detection .
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