MQ3 Alcohol Ethanol Sensor Module
The MQ3 Alcohol Ethanol Sensor Module is a reliable alcohol vapor detection module widely used in breathalyzer devices, gas alarms, safety systems, and Arduino/IoT projects. Designed with a highly sensitive SnO₂ semiconductor sensing layer, the MQ3 responds quickly to ethanol vapor concentrations in the air.
This sensor offers both analog output (AO) for measuring gas concentration and a digital output (DO) with adjustable sensitivity using the onboard potentiometer. Its compact design and 5V compatibility make it perfect for projects involving Arduino, NodeMCU, ESP32, Raspberry Pi, and other microcontroller boards.
Explore similar components here:
🔗 Electronics Components — https://electroway.org/product-category/electronics-components/
⭐ Technical Specifications
| Feature | Details |
|---|---|
| Model | MQ3 Alcohol Gas Sensor |
| Detectable Gas | Alcohol, Ethanol, Vapors |
| Detection Range | 0.05–10 mg/L |
| Operating Voltage | 5V DC |
| Output | Analog AO, Digital DO |
| Preheat Time | 20–30 seconds |
| Sensitivity Adjustment | Onboard potentiometer |
| Response Time | <10 seconds |
| Working Temperature | -10°C to 50°C |
The sensor is optimized for alcohol detection and is commonly used in breath gas analysis.
⭐ Applications
🚗 Safety & Industrial Monitoring
-
Alcohol breath analyzers
-
Drunk-driving detection systems
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Industrial ethanol safety monitoring
🤖 DIY & Arduino Projects
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Smart alcohol detection system
-
IoT-based breath monitoring device
-
Classroom & lab demonstrations
Check compatible controller categories:
🔗 Arduino Boards — https://electroway.org/product-category/arduino-and-accessories/arduino-boards/
🔗 NodeMCU Modules — https://electroway.org/product-category/iot-and-smart-solutions/iot-modules/nodemcu/
🔗 Raspberry Pi Cases/Accessories — https://electroway.org/product-category/electronic-accessories/mounts-and-cases/raspberry-pi-mounts-and-cases/
⭐ Precautions
⚠ Allow 20–30 seconds of preheating for accurate readings.
⚠ Do NOT expose the sensor to high concentrations of corrosive gases.
⚠ Keep away from dust, oil, and water droplets.
⚠ Use a stable 5V power supply to avoid inconsistent readings.
⚠ For breath analyzers, ensure fresh air calibration before each use.
Power accessories available here:
🔗 Power Supply Category — https://electroway.org/product-category/raspberry-pi-and-accessories/accessories-raspberry-pi-and-accessories/power-supplies-accessories-raspberry-pi-and-accessories/
⭐ YouTube Tutorial (MQ3 with Arduino)
📺 Watch Video:https://www.youtube.com/shorts/PzXYWwTBI4E
📌 Product Summary
The MQ3 Alcohol Ethanol Sensor provides accurate detection of alcohol vapors with fast response time and easy microcontroller compatibility. Ideal for breath analyzers, IoT monitoring devices, and safety applications, making it a must-have component for electronics developers and students.
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