Alcohol Gas Sensor – MQ-3

Description

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.

Please review the datasheet for conversions to ppm then Wikipedia.org for BAC.

Features:

5V DC or AC circuit
Requires heater voltage
Operation Temperature: -10 to 70 degrees C
Heater consumption: less than 750mW

Dimensions:

16.8mm diameter
9.3 mm height without the pins

Documents:

Datasheet
Arduino Tutorial in Portuguese
Wiring Example
Arduino Breathalyzer
Another Breathalyzer
bildr Tutorial