Am 10.07.2014 03:29, schrieb Loren Amelang:
> Except I ended up with a 10K resistor in parallel with the suggested
> 4.7K pullup, for 3197 ohms, before I actually got real readings.
>
This stinks the way the strong pullup is missing during temperature
conversion. See e.g. the DS18B20 datasheet, page 5. (Section:
Powering the DS18B20)
Usually, the I/O pin is pull-down only, with the resistor pulling the
bus line high. But during temperature conversion, it should be set into
push-pull mode so the high-side transistor of the I/O pin sources
current into the bus. Not sure if the w1 driver for your hardware
handles that correctly.
Kind regards
Jan
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