https://github.com/ControlEverythingCommunity/HDC1000/blob/80d9141d21ddc549b64cfb1da2253e6b5db39cf6/Python/HDC1000.py#L28 I had to change the line above to: ```py data1 = bus.read_byte(0x40) ``` Same for https://github.com/ControlEverythingCommunity/HDC1000/blob/80d9141d21ddc549b64cfb1da2253e6b5db39cf6/Python/HDC1000.py#L45 After that change it works!