I've got 46 switches/31 LED matrix sharing the same column via ULN2803. Now, since I've got lots of wires I'm getting lost here since I obviously made a wiring error somewhere. The issue is that pressing any button on 3rd column causes one LED to turn on (dimly). That LED is connected to other column which is turned off (I've only turned on 3rd in code). Any suggestion what I might have done wrong?
kustom:
Any suggestion what I might have done wrong?
Maybe not posting your code and schematic?
Just a guess...