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The MQ7 sensor is designed to detect carbon monoxide (CO) gas in the air. It uses a metal-oxide semiconductor that changes resistance when exposed to CO. The sensor provides both analog and digital outputs, allowing easy integration with microcontrollers. It is widely used in carbon monoxide detectors, fire alarms, and industrial gas monitoring systems. The MQ7 has a high sensitivity to CO while being less affected by other gases. It operates at 5V and requires a cyclic heating mechanism for accurate detection. The module is compact, reliable, and essential for preventing CO poisoning. It ensures safety in homes, vehicles, and enclosed spaces where CO buildup is dangerous.