Sensitive material MQ-3 gas sensor is used in clean air low conductivity tin oxide (SnO2). When there is alcohol vapor in the environment sensor, conductivity sensor with increasing gas concentration of alcohol in the air increases. Use simple circuit can convert the change in conductivity of the gas concentration corresponding to the output signal. High MQ-3 gas sensor sensitivity to alcohol, can resist the interference of gasoline, smoke, water vapor. The sensor can detect a variety of alcohol concentration in the atmosphere, is a low-cost sensor suitable for a variety of applications.
VCC: positive power supply (5V)
GND: power supply is negative
DO: TTL switching signal output
AO: analog signal output
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 a voltage of about 4V
Special note: After the sensor is powered, needs to warm up around 20S,measured data was stable, heat sensor is a normal phenomenon, because the internal heating wire, if hot is not normal .
1 * MQ-3 Alcohol Sensor Module