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Re: glitch
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Posted by Phil on Tuesday, 5 August 2008, at 8:23 a.m.,
in response to glitch, posted by Lorne
I do see what you are describing. It does appear that the TStat8 board is signalling a "no Call" condition one and a while when it would appear that there IS a call being made.
I have discovered that the voltages sent to thermostats can vary greatly from one control unit to another, so it is possible that the TStat8 is getting signals that it considers "marginal". It's equally possible that there is some condition that I overlooked in the design.
Since the inputs are all optically isolated, I had to choose a series current limiting resitor that would give a positive response without loading the tstat lines more than necessarily. It's possible that in your case that resistance is too large.
I had considered adding some components that would "latch-in" the signal in the event of voltage drop-outs, but my inital testing showed that this was unneccesary. Perhaps not.
I would produce a modified version of the board for you to test if you were interested in swapping out your existing TStat8 board. The new board would have a different 1-Wire address, but you could just move the existing device names to this new board.
Interested?
Phil.
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