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Turbostat

Thermostat state monitor.

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Helping a friend solve:

"I'm trying to use an optoisolator to read a 24VAC signal and turn it into a 5VDC logic so I tell when my thermostat is on or off. Have arduino board for the logging. Just having trouble figuring out the resistance values I'll need see schematic. This on was designed for the pi and uses 3.3vdc power ideally I would like to use the arduino 5v onboard power. I know the values of the resistors need to be modified. Also is there any way to test the circuit before I implement it I would rather not blow out my thermostat or aquastat on the furnace as those are expensive. Just not sure where I can get a 24vac signal other than from the furnace." - Turbo

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