Description:
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
Size: 32 mm x 20 mm x 22 mm.
The switching signal having a DO (TTL) output and analog output AO.
TTL output valid signal is low. (Low-level signal when the output light can be directly connected to the microcontroller or relay module)
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, the maximum concentration of a voltage of about 4 V.
Special note: After the sensor is energized, it needs to be preheated for about 20 seconds, and the measured data is stable. The heating of the sensor is a normal phenomenon, because there is a heating wire inside, if it is hot, it is not normal
Application:
For on-site detection of motor vehicle drivers and other non-drinking workers, but also for detecting other places of ethanol vapor, alcohol detection range: detection range 10 ~ 1000ppm
Wiring:
VCC: positive power supply (5V).
GND: power supply is negative.
DO: TTL switching signal output.
AO: analogue signal output.
Package includes:
1 x MQ-3 alcohol sensor module.