Quote:
Originally Posted by opiesche
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?
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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.