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Old 10-09-12, 05:30 PM   #42
Mikesolar
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Quote:
Originally Posted by opiesche View Post
That seems to be exactly what I'm looking for! I might be able to drive this directly from the Raspberry Pi's GPIO, with a little protection circuit in between - I'm not sure how they determine direction, since there's only one signal wire. The data sheet doesn't provide much insight, how does one change actuation direction through the input signal?
There are a number of different models but a couple of them are 0-10vdc so if you can provide a 0-10v signal as a proportion of an outdoor temp or as a comparison between two temps such as an outdoor temp and a supply to the floor temp, you could make it work. Other models have a 0v and a +24 and a -24v wire which is controlled through a SPDP relay which your control can turn on or off, using the output temp as a goal.

Just a thought.
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