MQ3 Alcohol Gas Sensor Module

MQ3 Alcohol Gas Sensor Module 

The MQ-3 Alcohol Gas Sensor Module is a semiconductor gas sensor board designed to detect alcohol vapor (ethanol) in the air. It uses a sensitive tin dioxide (SnO?) sensing element whose resistance changes when exposed to alcohol molecules. The module includes an integrated heater to bring the sensing element to its optimal operating temperature, and provides an analog output that varies with alcohol concentration. Many versions of this module also include a digital output with an adjustable threshold for simple gas-presence detection. It’s widely used in DIY projects, safety systems, and applications requiring basic alcohol vapor sensing.

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Features

• Sensitive to alcohol vapor (ethanol)
• Analog output proportional to gas concentration
• Often includes a digital (threshold) output with adjustable sensitivity
• Integrated heater for stable operation
• High sensitivity and fast response
• Easy to interface with microcontrollers (ADC required)
• Compact, low-cost module suitable for prototyping and embedded systems
• Long service life

Typical Applications

• Breath alcohol detectors and alcohol level monitoring
• Safety systems in vehicles, bars, or public spaces
• Portable alcohol vapor detection devices
• Smart home automation with alcohol/odor alerts
• Environmental air quality sensing
• Educational and hobbyist electronics projects
• Embedded IoT sensor systems
• Interactive installations where alcohol presence needs monitoring