MQ-3 Alcohol Ethanol Sensor Breath Gas Detector Ethanol Detection for Arduino

The analog gas sensor – MQ3 is suitable for detecting alcohol, this sensor can be used in a Breathalyser.It has a high sensitivity to alcohol and small sensitivity to Benzine. The sensitivity can be adjusted by the potentiometer.

KES 400.00

Out of stock

SKU: 589 Categories: ,



  • Gas leakage monitoring device can be used in homes and factories, and is suitable for the detection of alcohol;
  • Sensitivity adjustable the blue digital potentiometer adjustment
  • Before the use of the operating voltage 5V power supply at least warm-up for more than two minutes, the sensor slightly hot is normal;
  • Output in the form
    • analog voltage output
    • digital switching outputs (0 and 1)
  • With fixed bolt hole for easy installation
  • Small board PCB size: 4.5cm * 1.8cm

Module interface specification (4-wire)

  • VCC 5V operating voltage
  • GND to connect GND
  • DO small board digital switch output interfaces (0 and 1)
  • The AO small board analog output interface


Instructions for use

  • MQ-2 sensor module is most sensitive to environmental alcohol gas.
  • When the module in the alcohol-free gas impact or alcohol gas concentration does not exceed the threshold value, the digital interface DO port outputs a high level, the analog interfaces A0 basic voltage is 0V. When the alcohol gas exceeds the threshold value is set, the module digital interface D0 Output low, the analog interface A0 output voltage as the influence of the gas is slowly increased;
  • The small board digital output D0 can be connected directly with the MCU, which detect high or low TTL,  by doing this, environmental alcohol gas can be detected;
  • Small board digital output DO can directly drive our relay module, in this way, this can be composed of an alcohol gas switch;
  • Small board digital output DO can directly drive our active buzzer module, this can be can be composed of an alcohol gas alarm;
  • Small board analog output AO connected to the AD module from store, through the AD converter, you can get the precise value of the environment alcohol gas concentration;


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.