Detecting 24V AC with an ESP32

Channel:
Paul M
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Published on ● Video Link: https://www.youtube.com/watch?v=C4kNbceWMxM


Duration: 3:46
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This is a simple 24VAC detector using an ESP32 microcontroller, an SFH620AGB optocoupler, and a 10K resistor. When I cranked up the sample rate, I saw the expected 120 Hz oscillation.

I got the idea from https://electronics.stackexchange.com/questions/348962/how-to-drive-optoisolator-from-mains, though 20-30VAC is less scary than mains voltage.

The toroidal transformer is a Vigortronix VTX-146-030-212.



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