MQ-2 Gas Sensor (Smoke & Combustible Gas Detection)

The MQ-2 Gas Sensor is a widely used multi-gas sensor capable of detecting smoke, LPG, methane, hydrogen, and carbon monoxide. It offers high sensitivity and fast response, making it ideal for gas leakage alarms and safety systems in residential and industrial environments. The sensor operates using SnO₂ semiconductor technology, where conductivity increases with gas concentration.

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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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