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How does a digital thermostat really work inside?
In another thread, I posted:
"I do not know how the cycles/hr mechanism of a digital thermostat
really works. I have tried to find out, without success. And I have two
of them in my house, both Honeywells.
One way they could work is to vary the hysteresis (size of the dead zone), and that the numbers indicated are just approximate.
Another way is they could count the on-off operations and arbitrarily
stop (in the off position) when the count was met until the time
expired. This seems a lousy way to do it.
A third way is to run the output of the thermistor through a low pass
filter and set the bandwidth to, e.g., 1 cycle/hr, 2 cycles/hr, etc. In
analog days, this would be impractical, but with modern digital
filters, it would be no problem at all."
It was suggested that I post it here as being a better venue to get it answered. I recognize that there may be a fourth way: the way they really do it.
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