Alcohol Ethanol Detection Gas Sensor MQ3 Module – India

Want to build a Breathanalzyer circuit, that too with a budget? Buy online Circuit Uncle’s MQ3 Alcohol Detection Gas Sensor, and get it to your doorsteps in India, with fast shipping.

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Ever wonder how those Alcohol detector circuits (Breathalyzers) which are generally handled by Indian cops to catch drunk drivers works? Those Breathalyzer (Alcohol detectors devices) utilize the Alcohol Detection Gas Sensor MQ3, which you can buy online in India at Circuit Uncle- Home for IoT/Embedded/Robotics components and solutions. This module provides both digital and analog outputs that you can utilize to read through your favorite Arduino or Raspberry Pi. Long lifespan (durability), the simple drive circuit, and high sensitivity towards alcohol are some of its qualities.

This Alcohol Gas Sensor MQ3 module is a low-cost sensor module that can detect the presence of alcohol (at air concentrations ranging: 0.05 mg/L to 10 mg/L) (between 200 to 10000 ppm-parts per million). The MQ3 is made of SnO2 (Tin Dioxide), of whose conductivity is lower in clean air when compared to Alcohol vapor containing air. The conductivity of the sensor is in proportion to alcohol gas concentration. MQ3 has high selectivity towards alcohol, thus it’s readings don’t get affected by smoke, water vapor, and petrol.

MQ3 Arduino UNO Alcohol Detector Circuit - Circuit Uncle - Buy online in India
MQ3 Arduino UNO Alcohol Detector Circuit – Circuit Uncle – Buy online in India

Technical Specifications of MQ3

  • Power requirements: 5 VDC @ ~165 mA (heater on) / ~60 mA (heater off)
  • Operation Temperature : -10°C ~ 70°C
  • Operating Voltage: 5V ±0.1
  • Detection Concentration : 0.05 mg/L ~ 10 mg/L Alcohol
  • Sensing Resistance Rs: 2KΩ-20KΩ(in 0.4mg/l alcohol)
  • Dimensions: 32 x 22 x 16 mm
  • Current Consumption: 150mA
  • DO output: TTL digital 0 and 1 ( 0.1 and 5V)
  • AO output: 0.1- 0.3 V (relative to pollution), the maximum concentration of a voltage of about 4V


  • MQ3 Alcohol Detector Sensor Module Pin Configuration
    VCC – Input Power Supply
    GND – Supply Ground
    DO – Digital Output
    AO – Analog Output

MQ3 Alcohol Detector Sensor Module- Circuit Uncle - Buy online in India

Usage of Alcohol Detection Gas Sensor MQ3 Module (which you can buy online in India)

  • Usage-Home/Hobby Project
  • Alcohol Detector Circuits
  • Breathalyzer

Datasheet of MQ3 Alcohol Detection Gas Sensor Gas Sensor

Additional information

Weight 300 g
Dimensions 180 × 70 × 1 cm

1 review for Alcohol Ethanol Detection Gas Sensor MQ3 Module – India

  1. Shiva Ganeshan

    I have used it for my own breathalyzer circuit. It was a fun project, all my friends and teachers praised it.

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