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By Sirquil
#78241 Schematic used in testing project file: ""Furnace_Monitor.ino."

4N25 OptoIsolator Schematic.JPG


May require addition circuitry for connecting to furnace. such as rectification of AC and and a voltage divider.
This is not your typical DIY project; consult a HVAC professional before connecting to furnace!

William
Attachments
Current version of "Furnace_Monitor.ino" Still in testing phase, working. Running furnace simulated with above circuit, No debouncing required.
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