Reply to "Using an optocoupler to connect insulated rail to input pin of shift register"

johnfOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Chris,

The circuit I am using is very simple:

The 10v AC is from the same transformer that I am using for track power, so it has the same common as my isolated rail feeds. The Arduino pin is set as INPUT_PULLUP initially, and then it goes to LOW when the optocoupler is activated. I think JGL is just using a separate 12v DC source to trigger the optocoupler. He also added a diode on the inputs. The ground of the DC is connected to the layout ground.

Here is a link to my Arduino sketch.

4/5/178:05 PM

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