Need some help here. I have never worked with photocouplers before, so this is totally new for me. Ive connected a nec 2501 to control an input to arduino from my car. it should read a car switch (12-15v) on/off. Connected like this: Car 12 -> anode cathode -> 1k resistor -> GND Arduino 3.3v -> …

Nec 2501 photocoupler

MarkT September 17, 2012, 10:26pm 2

Double check the pinout, what you've described ought to work from what I can tell.

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