Alcohol Sensor MQ3 (Analog/Digital)

From the shop's description

The analog gas sensor - MQ3 is suitable for detecting alcohol, this sensor can be used in a Breathalyser. It has a high sensitivity to alcohol and small sensitivity to Benzine. The sensitivity can be adjusted by the potentiometer. Specification Support both the output digital value and the output analog value. Power supply: 5V Interface type: Analog/Digital High sensitivity to alcohol and small sensitivity to Benzine Fast response and High sensitivity Stable and long life Size: 40x20mm Pin Connection: GND: Ground, Dout: digital output, Aout: analog output Vcc: 5V Datasheet Arduino Tutorial in Portuguese Arduino Breathalyzer