Sensitive material MQ-3 gas sensor is used in clean air low conductivity tin oxide (SnO2). When there is alcohol vapour in the environment sensor, conductivity sensor with increasing gas concentration of alcohol in the air increases. Using a 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 vapour. The sensor can detect a variety of alcohol concentration in the atmosphere, and is a low-cost sensor suitable for a variety of applications.

Features:

Using high-quality dual-panel design, with power indicator and TTL signal output instructions.
The switching signal has 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 )
Analog output voltage with the higher concentration of higher voltage
There are four screw holes for easy positioning.
Has a long life and reliable stability
Rapid response and recovery characteristic
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.