MQ-3 Alcohol Ethanol Sensor Module


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The MQ series of gas sensors uses a small indoor heater with an electrochemical sensor. They are sensitive to a range of gases and are used indoors at room temperature. The output is an analog signal and can be read with an analog input of the Arduino.

This MQ-3 alcohol sensor is suitable for detecting breath alcohol concentration, as is a common breathalyzer. It has a high sensitivity and fast response time. The sensor provides a resistive analog output based on alcohol concentration.


  • Working voltage: 5V.

  • Pin Definition: 1_output, 2_GND, 3_VCC.

  • Quick response functions.

  • With a long life and reliable stability.

  • Main Chip: MQ-3 Alcohol Sensor.

  • Dual output: Analog output and TTL level output.

  • High sensitivity to alcohol.

  • Mounted on the module with connecting pins.

  • Adjustable sensitivity with potentiometer.

  • Size: 32mm x 22mm x 24mm.

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