Sensing thermostat heating/cooling calls

Have you looked at this? I am not sure if it will do exactly what you want, but maybe you could try it?

That won't do it, it just uses the state that the thermostat reports and tells you the run time for each state so you can see usage statistics, sorry.

This app requires you to have a thermostat device in Hubitat. If my thermostats were easy to put into Hubitat as devices, I would already have solved my issue.

My attempt to read the thermostat outputs with the Sage Doorbell sensors did not work. The sensors flooded my ZigBee spectrum with events. My next line of investigation is the Arduino circuit posted here.

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