MQ7 Carbon Monoxide CO Gas Sensor

MQ7 Carbon Monoxide CO Gas Sensor 

The MQ?7 Gas Sensor is a semiconductor sensor designed to detect carbon monoxide (CO) gas in the air. It consists of a tin dioxide (SnO?) sensing element whose resistance changes in response to CO gas concentration. The sensor includes a heater to maintain optimal operating temperature, allowing accurate detection. The MQ?7 provides an analog output proportional to the CO concentration, making it easy to interface with microcontrollers such as Arduino, ESP32, or Raspberry Pi via an ADC. It is commonly used for safety monitoring, leak detection, and educational projects.

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Features

• Sensitive to carbon monoxide (CO)
• Provides analog output for gas concentration
• Integrated heater for stable and reliable operation
• Long life and low cost
• Simple to interface with microcontrollers
• Compact and suitable for prototyping
• Can detect CO at low concentrations
• Optional digital output on some modules with adjustable threshold

Applications

• CO leak detection in homes, garages, and offices
• Carbon monoxide safety alarms
• Portable gas detectors and handheld safety devices
• Environmental air quality monitoring
• Industrial safety systems
• Smart home automation with gas alerts
• Educational and hobbyist electronics projects
• Embedded systems and IoT applications