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The MQ-3 Alcohol Ethanol Gas Sensor Module is a high-sensitivity, low-cost sensor designed to detect alcohol vapor in the air. Using the SnO2 sensitive material, its conductivity increases with the concentration of alcohol, allowing precise detection. The module provides both digital (DO) and analog (AO) outputs, making it easy to integrate with microcontrollers, Arduino boards, and Raspberry Pi for real-time alcohol detection. It is widely used in vehicle alcohol detection systems, portable breath analyzers, and other DIY electronics projects in Bangladesh.

Features:

• High sensitivity to alcohol gases, low interference from smoke, vapor, and gasoline.

• Dual outputs: Digital (DO) and Analog (AO) for flexible integration.

• Low-cost and easy to use for DIY electronics projects.

• Fast response and stable performance with long operational life.

• On-board LED indicator to show sensor operation status.

• Threshold for digital output easily adjustable with the onboard potentiometer.

• Compatible with Arduino, Raspberry Pi, and other microcontrollers.

• Compact size with mounting holes for easy installation.

How to Use:

• Connect VCC to 5V power supply and GND to ground.

• Connect DO (digital output) to a microcontroller pin or buzzer module for threshold detection.

• Adjust the onboard potentiometer to set the digital output threshold.

• Connect AO (analog output) to an analog input of your microcontroller for precise alcohol concentration measurement.

• Place the sensor in an area where alcohol gas detection is required, ensuring proper ventilation.

• Use the LED indicator to monitor the sensor status during operation.

• Integrate with software to trigger alarms or record measurements in real time.

Specifications:

• Measuring Range: 0.04 mg/L – 4 mg/L

• Operating Voltage: 5V ±0.1

• Digital and Analog Outputs (DO and AO)

• On-board LED Indicator

• Pins: Goldpin connectors, 2.54mm pitch

• Dimensions: 35mm x 22mm x 30mm

• Mounting Holes: 3.2mm diameter

Pin Out:

• VCC: Input Power Supply

• GND: Ground

• DO: Digital Output (threshold adjustable)

• AO: Analog Output (proportional voltage signal for alcohol concentration)

Applications:

• Vehicle Alcohol Detection System

• Portable Alcohol Breath Analyzer

• DIY Alcohol Gas Detection Projects

• Real-Time Alcohol Monitoring in Industrial and Laboratory Environments

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