MQSensorsLib
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PPM of MQ135 at clean air
Hi.
Why you guys considered RS / R0 = 3.6 for MQ135 sensor?? Datasheet says constant value of 4.4. Check the following line, please:
https://github.com/miguel5612/MQSensorsLib/blob/27465dfb992595bb5b6bc9c20659333a1bcf4758/examples/Calibration/Calibration.ino#L38