Specification:

Features:

• Target Gas:
  Specifically designed to detect Alcohol (Ethanol vapor) in the air.

• High Sensitivity to Alcohol:
  Excellent response to ethanol, with slight sensitivity to benzine, smoke, and other organic vapors.

• Detection Range:
  Typically detects Alcohol concentrations from 25 to 500 ppm.

• Fast Response and Recovery:
  Quickly senses alcohol presence and clears the reading soon after the gas is removed.

• Dual Outputs:

  • Analog Output (AO): Proportional to the alcohol vapor concentration.

  • Digital Output (DO): Goes HIGH when alcohol concentration exceeds set threshold (adjustable via potentiometer).

• Adjustable Sensitivity:
  Onboard potentiometer allows tuning of the digital threshold level to meet your application needs.

• Power Supply Voltage:
  Operates on 5V DC.

• Stable and Long-Lasting Sensor:
  Built-in tin dioxide (SnO₂) sensing layer with long operating life and stable output.

• Preheat Time:
  Requires 20–30 seconds of preheating time for accurate results.

• Easy to Interface:
  Works well with Arduino, ESP32, Raspberry Pi, and other microcontrollers.

• Onboard LEDs:
  Includes power indicator LED and digital output status LED.

Deacription:

This is the MQ-3 Gas Sensor Module, which is simple to use. It can sense the presence of Alcohol in the air. The module uses our MQ-3 sensor. It simplifies the interface to the odd pin spacing of the sensor and provides an interface through standard 4 x 0.1″ header pins.  MQ-3 gas sensor provides an analog output corresponding to the concentration of the gas in the air and an easy-to-use digital output.

The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. Its conductivity increases as the concentration of alcohol gasses increases. It has a high sensitivity to alcohol and has good resistance to disturbances due to smoke, vapour and gasoline. MQ-3 gas sensor module provides both digital and analog outputs. It can be easily interfaced with Microcontrollers like Arduino Boards , Raspberry Pi etc.

This MQ-3 alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. The sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC