If you’ve missed out on part 1 of this tutorial, you can catch up here.

If you closely read the HTU21D_datasheet, you’ll realise that the humidity data that you read directly from the HTU21D sensor does not meet the device’s guaranteed humidity accuracy of +-3%. Additionally, the sensor is only optimised to perform in the range of 5-95%RH, the rated accuracy of +-3% only applies between 20-80%RH.

This excerpt from the datasheet shows the device’s range of performance.

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