MQ-3 Semiconductor Gas and Alcohol Vapor Sensor + Potentiometer

MQ-3 - Semiconductor Gas and Alcohol Vapor Sensor

The MQ-3 sensor features exceptionally high sensitivity to the presence of alcohol in the air while offering high resistance to interference caused by gasoline, smoke, or vapors of other substances. The module is perfectly suited for detecting various alcohol concentrations in the air, making it an excellent choice for projects requiring precise analysis, such as stationary and portable detectors. The module is an ideal fit for Arduino, ESP32, ESP8266, and Raspberry Pi projects.

The device is equipped with two types of outputs: digital (D0) with a trigger threshold adjustable via the built-in potentiometer, and analog (A0). Connecting the analog output to an A/D converter input enables accurate measurement of alcohol concentration. The MQ-3 sensor combines long service life, low cost, and ease of installation.

⭐ Benefits of Using the Module

• High sensitivity and selectivity to alcohol vapors with minimal sensitivity to smoke or gasoline.
• Dual output signal allows for simple threshold detection or accurate analog measurement.
• Easy calibration of the digital output switching threshold using the built-in potentiometer.
• Long service life and stable circuit operation under various environmental conditions.
• Quick and easy installation enabling hassle-free connection to breadboards and actuator modules.

Example Applications

• DIY breathalyzers and sobriety analysis devices.
• Security and lockout systems in vehicles and machinery.
• Indoor air quality monitoring stations.
• Alarm circuit design responding to the presence of chemical vapors.
• Educational electronics projects for Arduino, ESP32, ESP8266, and Raspberry Pi.

Key Technical Specifications

• Supply voltage: 5 V
• Output signal: digital (D0) and analog (A0)
• Measured substance: alcohol concentration in air
• Measuring range: 0.04 mg/l to 4 mg/l
• Operating temperature: -10°C to 50°C
• Module dimensions: 33 mm x 20 mm