MQ-3 Alcohol Detector Gas Sensor Module

The MQ-3 Alcohol Detector Gas Sensor Module is a high-sensitivity module designed to detect the presence of alcohol vapors in the air. This sensor uses a SnO₂ (tin dioxide) sensitive layer, which changes its electrical resistance in proportion to the concentration of alcohol gas, making it perfect for projects that require alcohol detection or breath analysis.

The module operates efficiently at 5V and features both analog and digital outputs, allowing it to be easily interfaced with microcontrollers such as Arduino, ESP32, ESP8266, and Raspberry Pi. The onboard comparator chip (LM393) provides a digital output signal when the alcohol concentration exceeds a certain threshold, which can be adjusted using the built-in potentiometer.

Thanks to its high sensitivity to alcohol vapor and fast response time, the MQ-3 module is widely used in breath analyzers, vehicle safety systems, home safety monitors, and smart IoT alcohol detection devices. The module also includes a preheat circuit for stable readings, ensuring consistent performance in long-term applications.

Available now at eleberric.com, your reliable online electronics store in Sri Lanka for all types of gas sensors, Arduino modules, and IoT components.

Specification

• Model: MQ-3

• Operating Voltage: 5V DC

• Sensor Type: Semiconductor (SnO₂)

• Detection Range: 0.05 mg/L to 10 mg/L (alcohol vapor)

• Output: Analog (AO) and Digital (DO)

• Sensitivity: High to alcohol, low to benzine and smoke

• Preheat Time: 20 seconds (typical)

• Operating Temperature: -10°C to +50°C

• Dimensions: Approx. 32mm × 20mm × 22mm

Key Features

• High sensitivity to alcohol vapors

• Fast response and recovery time

• Adjustable detection threshold via onboard potentiometer

• Analog and digital outputs for flexible integration

• Compatible with Arduino, ESP32, ESP8266, and Raspberry Pi

• Onboard power and signal indicator LEDs

• Stable performance with built-in comparator (LM393)

Applications

• Alcohol breath analyzers and testers

• Vehicle driver safety monitoring systems

• IoT-based alcohol detection devices

• Smart home alcohol safety monitoring

• Industrial alcohol vapor detection

• Educational and DIY Arduino projects