ALLNET 4duino MQ-3 alcohol-gassensor (ALL_OY_3327)

The ALLNET 4duino MQ-3 Alcohol Gas Sensor (ALL_OY_3327) stands out for its dual analog and digital outputs, allowing flexible integration with Arduino, Raspberry Pi, and other microcontrollers. Unlike simple alcohol detectors, this module uses a semiconductor SnO2 sensing element with an adjustable potentiometer for sensitivity tuning, making it suitable for both threshold-based alarms and precise analog measurements.

Highlights

• Detects alcohol (ethanol), benzine, hexane, LPG, and CO
• Analog (0-5V) and digital (TTL) output signals
• On-board potentiometer for sensitivity adjustment
• Fast response time of ≤10 seconds
• Wide detection range: 0.05–10 mg/L alcohol (300–10000 ppm)
• 4-pin header interface (VCC, GND, DOUT, AOUT)

In daily use

The MQ-3 sensor is ideal for breathalyzer projects, air quality monitoring, and safety systems. After a preheat time of approximately 20 seconds, the sensor provides stable readings. The analog output can be read by any ADC, while the digital output triggers when the gas concentration exceeds a threshold set by the potentiometer. The module operates at 5V DC and consumes less than 150 mA, making it suitable for battery-powered applications.

Full specifications

• Sensor type: Semiconductor gas sensor
• Target gases: Alcohol (ethanol), benzine, hexane, LPG, CO
• Detection range (alcohol): 0.05–10 mg/L (300–10000 ppm)
• Operating voltage: 5V DC
• Heater voltage: 5V DC
• Output signal: Analog (0-5V), Digital (TTL)
• Interface: 4-pin header (VCC, GND, DOUT, AOUT)
• Response time: ≤10 s
• Recovery time: ≤30 s
• Operating temperature: -10°C to 50°C
• Operating humidity: ≤95% RH
• Sensor element material: Tin dioxide (SnO2)
• Adjustable sensitivity: Yes, via on-board potentiometer
• Preheat time: approx. 20 s
• Power consumption: <150 mA
• Compatibility: Arduino, Raspberry Pi, ESP32/ESP8266, microcontrollers

Final note

The ALLNET 4duino MQ-3 is a reliable and versatile gas sensor module for alcohol detection and more, offering both analog and digital outputs for flexible project integration.