Alcohol Sensor MQ-303A

MQ303A is a semiconductor sensor for Alcohol detection. It has very good sensitivity and fast response to alcohol, suitable for portable alcohol detector.

Specifications

• Heater voltage: 5V
• power: <150mW
• High sensitivity, fast respond

Dimensions

• Diameter: 9.4mm
• Height: 8mm (pins excluded)

Documentation and downloads

Note: Programming examples are referred to MQ3 sensor, but those sensors have similar working mode. Only response curves are different. Please refer to datasheets.

• Datasheet
• Arduino Tutorial (Portuguese language)
• Wiring example
• Breathalyzer with Arduino
• Another Breathalyzer
• Sectorzero.com tutorial: basic principles of alcohol sensors (Italian language)
• Wikipedia: Breath Alcohol Content (BAC)