Intermediate4/7/2026- Author: IoTSpark Maker
ESP32 + MQ-2: Gas and Smoke Sensor (Quick Test Sample Code)
The MQ-2 is an SnO2 (tin oxide) semiconductor sensor — when exposed to combustible gas (LPG, methane, propane) or smoke, the SnO2 surface's resistance changes, producing an analog signal proportional to concentration.
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4 steps2 components
The MQ-2 is an SnO2 (tin oxide) semiconductor sensor — when exposed to combustible gas (LPG, methane, propane) or smoke, the SnO2 surface's resistance changes, producing an analog signal proportional to gas concentration. It needs 24-48 hours of preheating the first time it's used for the SnO2 layer to stabilize — the biggest difference from the other sensors in this series.