• Front view of the MQ-3 Alcohol Sensor Module showing the round metal mesh sensing head.
  • Back view of the MQ-3 Alcohol Sensor Module featuring the LM393 comparator chip, blue potentiometer, and 4-pin connector.
  • MQ-3 Alcohol Sensor Module dimensions labeled 32.4mm × 20.4mm.
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MQ-3 Alcohol Sensor Module | High Sensitivity Ethanol Gas Detection

MQ-3 Alcohol Sensor Module | High Sensitivity Ethanol Gas Detection

HK$20.00
HK$20.00
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Delivery Options

  • Local delivery within Hong Kong and in-store pickup.​
  • Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.​
  • Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).​
  • Estimated delivery time: 1–3 business days after dispatch (Hong Kong).​
  • In-store pickup details (location and time) will be confirmed by email or phone message.​
  • Delivery times are estimates and may be affected by weather or unforeseen circumstances.​

The MQ-3 Alcohol Sensor Module is a cost-effective and reliable gas sensor designed for accurate detection of alcohol (ethanol) concentration in the air. It uses SnO₂ (tin dioxide) as its sensing material, which reacts sensitively to alcohol vapors. When alcohol is present, the sensor’s conductivity increases, converting gas concentration into a proportional voltage output signal.

The module offers high sensitivity to alcohol while maintaining strong resistance against interference from gasoline, smoke, and water vapor — making it ideal for various applications.

Key Features

  • Dual Signal Output: Provides both analog (AO) and digital (DO) signal outputs for flexible applications.
  • High Sensitivity: Detects alcohol vapors with a wide detection range of 10–1000ppm.
  • Clear Indicators: Dual-sided PCB with power LED and digital output indicator for easy status monitoring.
  • Adjustable Sensitivity: Onboard potentiometer allows tuning of the digital output (DO) threshold.
  • Easy Installation: Comes with four M3 mounting holes for secure attachment.
  • Stable & Durable: Long lifespan, fast response, and quick recovery times ensure reliable performance.

Typical Applications

  • Alcohol Testers: Ideal for DIY projects like building a personal or vehicle alcohol breath tester.
  • Environmental Monitoring: Detect ethanol vapor levels in workshops, labs, or industrial environments.
  • Arduino/MCU Projects: Easily integrates with Arduino, ESP32, Raspberry Pi, and other microcontrollers for automation or data logging applications.

Technical Specifications

Parameter Specification
Operating Voltage DC 5V
Current Consumption 150mA
Target Gas Alcohol (Ethanol)
Detection Range 10 – 1000ppm
AO Output (Analog) 0.1–0.3V in clean air, up to 4V at high concentration
DO Output (Digital) TTL-level 0/1 (0.1V / 5V)
Module Dimensions 32.4mm × 20.4mm
Net Weight 5.2g

Pin Definition

  • VCC: Connect to 5V DC power supply
  • GND: Connect to ground
  • DO: Digital output (TTL signal, connectable to MCU I/O pin)
  • AO: Analog output (connectable to MCU ADC pin)

Important Notes

  • Warm-up Required: The sensor needs about 20 seconds of preheating after power-on for stable readings.
  • Normal Heating: The internal heater may cause the sensor to feel warm — this is normal operation.
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