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MQ-3 Gas Sensor Module for Alcohol Detection

SKU: YCWETRJ2IY
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4.1 (70 reviews)
The MQ-3 Gas Sensor Module is a semiconductor-based alcohol detection module designed to sense ethanol (alcohol) vapors in the air. Built around the MQ-3 gas sensor, it uses a tin dioxide (SnO₂) sensing element whose electrical conductivity increases as the alcohol concentration rises. The module provides both analog (AO) and digital (DO) outputs, allowing it to be easily interfaced with...
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The MQ-3 Gas Sensor Module is a semiconductor-based alcohol detection module designed to sense ethanol (alcohol) vapors in the air. Built around the MQ-3 gas sensor, it uses a tin dioxide (SnO₂) sensing element whose electrical conductivity increases as the alcohol concentration rises. The module provides both analog (AO) and digital (DO) outputs, allowing it to be easily interfaced with Arduino, ESP32, Raspberry Pi, STM32, and other microcontrollers.

The module features an onboard LM393 comparator and an adjustable potentiometer for setting the digital detection threshold. It offers high sensitivity to alcohol while maintaining good resistance to interference from gasoline, smoke, and other vapors. Due to its fast response time and simple interface, the MQ-3 module is widely used in breath analyzers, vehicle safety systems, industrial monitoring, alcohol detection equipment, and educational electronics projects.

Key Features

  • High sensitivity to alcohol (ethanol) vapor
  • Tin dioxide (SnO₂) semiconductor sensing element
  • Analog and digital output signals
  • Adjustable detection threshold via onboard potentiometer
  • Built-in LM393 voltage comparator
  • Fast response and recovery time
  • Good resistance to gasoline, smoke, and vapor interference
  • Power and output status LEDs
  • Simple 4-pin interface
  • Long operational life
  • Stable and reliable performance
  • Easy integration with Arduino, ESP32, STM32, Raspberry Pi, and other microcontrollers
  • Ideal for breath alcohol detection and gas monitoring applications

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Specifications

Specifications:

Module Type: Alcohol Gas Sensor Module
Sensor Model: MQ-3
Sensing Technology: Semiconductor (SnO₂)
Target Gas: Alcohol (Ethanol)
Operating Voltage: 5V DC
Operating Current: Approximately 150mA
Heater Voltage: 5V DC
Heater Resistance: Approximately 33Ω ±5%
Heating Power Consumption: Less than 800mW
Detection Range: 0.05mg/L to 10mg/L Alcohol (Module); approximately 25–500ppm (Sensor)
Output Type: Analog (AO) and Digital (DO)
Digital Output: TTL Logic Level
Comparator IC: LM393
Sensitivity Adjustment: Onboard Potentiometer
Preheat Time: Recommended 24 Hours for Initial Calibration; Short Warm-Up Required Before Regular Use
Response Time: Fast Response (Typically <10 Seconds)
Operating Temperature: -10°C to +70°C
Operating Humidity: Up to 95% RH (Non-Condensing)
Module Dimensions: Approximately 32mm × 22mm × 16mm
Mounting Type: PCB Module with Through-Hole Mounting Holes
Compatibility: Arduino, ESP32, STM32, Raspberry Pi (ADC required for analog input), AVR, PIC, 8051, and other microcontrollers

Additional Resources

MQ-3 Gas Sensor.PDF

FAQ

1. What is the MQ-3 Gas Sensor Module used for?

The MQ-3 Gas Sensor Module is primarily used to detect alcohol (ethanol) vapor in the air. It is commonly used in breath analyzers, vehicle safety systems, industrial monitoring, and embedded electronics projects.

2. Does the MQ-3 sensor provide both analog and digital outputs?

Yes. The module provides an analog output (AO) proportional to the alcohol concentration and a digital output (DO) with an adjustable threshold set using the onboard potentiometer.

3. Can the MQ-3 module be used with Arduino and ESP32?

Yes. The MQ-3 module is compatible with Arduino, ESP32, STM32, Raspberry Pi (with an ADC for analog readings if needed), and many other microcontroller platforms.

4. Why does the MQ-3 sensor require a warm-up period?

The sensing element contains an internal heater that must reach its operating temperature for accurate measurements. An initial burn-in of about 24 hours is recommended for calibration, while a short warm-up period before regular use improves measurement stability.

5. Can the MQ-3 detect gases other than alcohol?

The MQ-3 is optimized for alcohol (ethanol) detection. While it may exhibit limited sensitivity to gases such as gasoline vapor and certain organic solvents, it is not intended as a general-purpose gas sensor and provides the best performance when detecting alcohol vapor.