MQ7 - Carbon Monoxide Sensor

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MQ-3 Sensor

Sensitive for Alcohol, Ethanol, smoke
The heater uses 5V
The Arduino blog about the "breathalyzer" using a MQ-3:

http://arduino.cc/blog/2010/09/23/arduino-breathalyzer-calibrating-the-mq-3-alcohol-sensor/

Reference: http://playground.arduino.cc/Main/MQGasSensors