Description
The MQ-3 Alcohol Sensor is designed to sense alcohol vapors with high sensitivity and stability. It is commonly used in breathalyzer projects, vehicle alcohol detection systems, and indoor alcohol monitoring applications.
The sensor provides both analog and digital outputs and includes an onboard potentiometer to customize the digital detection threshold.
It is easy to interface with microcontrollers such as Arduino, ESP32, and Raspberry Pi (via an ADC for analog input). The MQ-3 offers fast response time and a wide detection range, making it suitable for real-time alcohol detection and safety systems.
Key Features
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Detects alcohol vapors (ethanol)
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High sensitivity and fast response
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Analog and digital output modes
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Adjustable sensitivity through onboard potentiometer
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Built-in LED indicator for digital alerts
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Reliable and long-lasting sensing element
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Compatible with Arduino, ESP32, Raspberry Pi
Specifications
| Feature | Details |
|---|---|
| Operating Voltage | 5V DC |
| Detection Range | 10–1000 ppm alcohol (ethanol) |
| Output | Analog voltage, Digital HIGH/LOW |
| Sensitivity | High to ethanol vapor |
| Preheat Time | 24–48 hours (first use) |
| Current Consumption | ≤150 mA |
| Operating Temperature | -10°C to 50°C |
| Dimensions | 32 × 20 × 22 mm |
Applications
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DIY breathalyzer devices
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Alcohol detection in vehicles (driver safety systems)
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Workplace safety monitoring
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Indoor air quality systems involving alcohol vapor detection
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IoT-based ethanol/alcohol monitoring
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Academic and research projects involving gas sensing
Compatible Boards / Circuits
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Arduino (Uno, Nano, Mega)
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ESP32 / ESP8266
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Raspberry Pi (via ADC such as ADS1115)
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Displays, alarms, and IoT dashboards
Reviews
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