MQ-135 Gas Sensor (Air Quality Detection)

The MQ-135 Gas Sensor is a popular air quality sensor used for detecting ammonia, benzene, smoke, CO₂ (approximate), and other harmful gases. It is widely used in indoor air quality monitoring, smart homes, and environmental sensing systems.

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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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