Hi, I'm after a bit of guidance on how to detect a 12V supply please. Im building quite a complicated control project including 12 x digital temperature probes, a pressure monitor (0-5V), plus a 4x20 LCD display and also an ethernet shield, all being developed for a Mega. In the case of any of a r…

Detecting a 12V Source With Opto Isolator?

LarryD March 8, 2023, 5:26pm 4

You might want to revisit the emitter/base connections.

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