MQ-7 Gas Sensor (Carbon Monoxide Detection)

The MQ-7 Gas Sensor is a dedicated carbon monoxide (CO) sensor used in safety systems and air quality monitoring. It operates using cyclic heating (low/high temperature) to improve selectivity for CO detection. This sensor is widely used in industrial safety, home alarms, and automotive exhaust monitoring.

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All MQ sensors use SnO₂ semiconductor technology with resistance varying according to gas concentration.
Typical detection ranges: 10 ppm to 10,000 ppm depending on the gas type.
Require preheating (20–60 seconds or more) for stable readings.
Provide analog output + digital threshold output (via comparator board).

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