An analogue alcohol gas sensor based on the MQ-3 probe, designed for use with Arduino and other microcontrollers. The sensor outputs a voltage proportional to the concentration of alcohol vapour in the surrounding air, making it suitable for breathalyser-style projects, air quality monitoring, and gas detection experiments.

Part of the DFRobot Gravity sensor range, this module features a plug-and-play 3-pin analogue interface and an onboard potentiometer for adjusting sensitivity. The MQ-3 probe has high sensitivity to alcohol with low cross-sensitivity to benzene.

Key Features

• MQ-3 Gas Sensor Probe – High sensitivity to alcohol vapour
• Analogue Output – Voltage proportional to gas concentration
• Adjustable Sensitivity – Onboard potentiometer for calibration
• Gravity Interface – 3-pin analogue connector for plug-and-play wiring
• Immersion Gold Surface – Improved oxidation resistance
• Standard Mounting – Four 3mm holes at 5mm spacing
• Fast Response – Quick detection with stable, long-life operation

Ideal For

• DIY breathalyser and alcohol detection projects
• Air quality monitoring systems
• Arduino gas sensing experiments
• STEM education and sensor exploration

Specifications

• Sensor – MQ-3 alcohol gas probe
• Power Supply – 5V
• Interface – Analogue
• Dimensions – 36.4 × 26.6mm

Package Contents

• 1× Gravity Alcohol Sensor (MQ-3)
• 1× Analogue Sensor Cable

Resources

• Product Wiki
• MQ-3 Datasheet (PDF)
• Schematic (PDF)