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How to Calibrate And Use MQ9 Gas Sensor w Arduino

How to Calibrate And Use MQ9 Gas Sensor w Arduino

then comes the calibration process. just calibrate it to get about 100-150 from analogRead in a good air condition. normal air returns ~100-150 alcohol returns ~700 lighter gas returns ~750+ edit: just noticed this Arduino library for the MQ135 that might be helpful. edit2:

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