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SI7021 datasheet.

This is the data in ASCII I receive to my serial communication in Matlab. The first letter is the ASCII for the MS byte, the second is ASCII for the LS byte, then we have the checksum and ‘a’ just to test the line.

In the marked red below for example, t=116 and h=104, so th = 116 x 16 + 104 = 1960

By the formula in the data sheet I get -40°C (and I am not living on the North Pole); I expect 25°C.

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