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Hi, thanks for the library. I'm using it with a Raspberry Pi 2 B v1.1, raspbian kernel 4.4.21-v7+. This may be more of an upstream bug, but I'm getting odd results which I've traced to what I think is wrong behavior from the read32() method:

In [30]: hdc._read32(HDC1000_TEMP)
Out[30]: [95, 95, 95, 95]

i.e. self._device.readRaw8() returns the same value 4 times in a row. Interestingly, this does seem to be a valid first byte; I can put my finger on the sensor and watch all 4 numbers rise together. They're always the same though.

I messed around with the Adafruit_PureIO library a little bit to see if I could get it to read a different byte somehow, but no luck. I'm not yet familiar enough with i2c or the linux interface to it to understand exactly what's going on, but perhaps you've seen this issue before or have ideas.