This is an Arduino Alcohol sensor. It uses a MQ3 probe which can be used in a Breathalyser. It has a high sensitivity to alcohol and less sensitivity to Benzine.
The sensitivity is able to be adjusted by the potentiometer.ط¢آ ط¢آ The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.ط¢آ
To ease the difficulty of using this sensor, ط¢آ aط¢آ Gravityط¢آ Interface is adapted to allow plug&play. ط¢آ Theط¢آ Arduino IO expansion shieldط¢آ is the best match for this senor connecting to yourط¢آ Arduinoط¢آ microcontrollers.ط¢آ