This Alcohol Grove Sensor is a complete alcohol sensor module for Arduino. It is built with the MQ303A semiconductor alcohol sensor. This sensor has excellent sensitivity and is able to return rapid responses when exposed to alcohol. Therefore, it is suitable for making a "Breathalyzer". The module implements all the necessary circuitry for MQ303A such as power conditioning and heater power supply. This sensor outputs a voltage inversely proportional to the alcohol concentration in air.
This product works on 5V only, so it is therefore not suitable for 3.3V boards like SODAQ and the Seeeduino Stalker.