MQ7 Carbon Monoxide Gas Sensor Module

MQ7 Carbon Monoxide Gas Sensor Module 

The MQ?7 Carbon Monoxide Gas Sensor Module is a low?cost semiconductor gas sensor designed to detect carbon monoxide (CO) in the air. It uses a sensitive tin dioxide (SnO?) sensing element whose resistance changes in the presence of carbon monoxide gas. The module includes a heater to bring the sensing material to its optimal operating temperature and typically features analog output (and sometimes a digital output comparator) for easy interfacing with microcontrollers such as Arduino, ESP32, or Raspberry Pi (with an ADC). The MQ?7 is commonly used for basic CO detection in safety and monitoring systems.

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Features

• Detects carbon monoxide (CO)
• High sensitivity to CO gas
• Analog output proportional to gas concentration
• Often includes digital output with adjustable threshold
• Integrated heater for stable operation
• Low cost and long service life
• Easy to integrate with microcontrollers via ADC
• Compact module suitable for prototyping and embedded designs

Applications

• CO leak detection in homes, garages, and enclosed spaces
• Carbon monoxide safety alarms and monitoring systems
• Portable gas detectors and handheld safety devices
• Environmental air quality monitoring
• Industrial safety systems requiring basic CO detection
• Smart home automation with gas warning alerts
• Educational and hobbyist projects involving gas sensing