The MQ-3 is an alcohol gas sensor suitable for detecting alcohol concentration in the air, similar to a breathalyser. It provides an analog resistive output based on alcohol concentration, with high sensitivity and fast response time. The drive circuit is simple — just one resistor is needed, and the output can be read by a 0–3.3V ADC.

Key Features

• Alcohol Detection – High sensitivity to alcohol vapour concentration
• Analog Output – Resistive output proportional to gas concentration
• Simple Interface – Requires only one external resistor
• Operating Voltage – 5V DC or AC circuit
• Heater Consumption – Less than 750mW
• Operating Temperature – -10°C to 70°C

Specifications

• Diameter – 16.8mm
• Height – 9.3mm (without pins)

Ideal For

• Breathalyser projects
• Air quality monitoring
• Arduino and microcontroller gas detection projects

Package Contents

• 1× MQ-3 alcohol gas sensor

Resources

• MQ-3 Datasheet (PDF)