MQ-7 Carbon Monoxide (CO) Gas Sensor Module

The MQ-7 is a high-sensitivity gas sensor specifically designed to detect Carbon Monoxide (CO) gas.
It is commonly used in gas leakage alarms, home safety devices, industrial monitoring systems, and indoor air-quality projects.

The sensor operates using a dual-heater cycle (low-heat and high-heat mode), which improves detection accuracy.
It uses a tin dioxide (SnO₂) sensing material that changes resistance when CO gas is present.
The module is easy to interface with Arduino, ESP32, Raspberry Pi, and other microcontrollers.