MQ303A Alcohol Sensor

MQ303A Alcohol Sensor 

The MQ303A Alcohol Sensor is a semiconductor gas sensor designed to detect alcohol vapor (ethanol) in the air. It uses a sensitive metal oxide (typically tin dioxide, SnO?) sensing element whose resistance changes when exposed to alcohol molecules. This change in resistance can be measured and correlated to the presence of alcohol vapor. The sensor includes a heater to bring the sensing material to its optimal operating temperature and is commonly used in breath alcohol detection, safety systems, and embedded electronics projects.

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Features

• Sensitive to alcohol vapor (ethanol)
• Uses a metal oxide semiconductor sensing element
• Analog resistance change output proportional to alcohol concentration
• Integrated heater for stable operation
• Compact and low-cost sensor
• Simple to interface with microcontrollers (ADC required)
• Fast response and recovery characteristics
• Suitable for prototyping and embedded use

Typical Applications

• Breath alcohol detection systems
• Portable alcohol vapor detection devices
• Vehicle safety and ignition interlock prototyping
• Environmental and air quality sensing
• Smart home safety alerts
• Educational and hobbyist electronics projects
• Embedded and IoT sensor applications