Am using a 4N25 opto to isolate and convert a 12V signal ( from a capacitive sensor ) to an Arduino input pin. The sensor is a N/C system so it is outputting 12V constantly. When the sensor is activated, the 12V drops to ground, so the LED is 'off' and the pullup makes the Arduino Input pin high (…

4N25 opto leaking ?

DaveO January 16, 2017, 10:14am 14

Here is the updated diagram with the new input pin values

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