Hi
I have tried to wire up a circuit according to this fritzing example
http://fritzing.org/media/projects/o/p/t/optocoupler/images/optocoupler_Optocoupler_1.jpg
But I'm using arduino as powersource on both sides (batteries are on charging at the moment)
First I didn't thought it was working at all, but when I look closely I can see that the LED light up very, very little.
I use 220 ohm resistors on both places.
I've tried different optocouplers with the same result (all 4n35)
So what am I doing wrong?
Best Regards
Niclas