This module is
made using Alcohol Gas Sensor MQ3. It is a low cost semiconductor sensor
which can detect the presence of alcohol gases at concentrations from 0.05
mg/L to 10 mg/L. The sensitive material used for this sensor is SnO2, whose
conductivity is lower in clean air. It’s conductivity increases as the
concentration of alcohol gases increases. It has high sensitivity to
alcohol and has a good resistance to disturbances due to smoke, vapor and
gasoline. This module provides both digital and analog outputs. MQ3 alcohol
sensor module can be easily interfaced with Microcontrollers, Arduino Boards,
Raspberry Pi etc.
This alcohol
sensor is suitable for detecting alcohol concentration on your breath, just
like your common breathalyzer. It has a high sensitivity and fast response
time. Sensor provides an analog resistive output based on alcohol
concentration. The drive circuit is very simple, all it needs is one resistor.
A simple interface could be a 0-3.3V ADC.
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