Heya people,
Dumb question for some smart people.
Just following Trash80's schematic, and I'm unsure where to tie the GB link cables' GND to, My first thought was to tie it to the GND on the arduino nano's board, but each will have their own independent power supply. (GB 4x+1.5V batteries, Arduinoboy, +5V PC USB)
So my question is, can I get away with tying the link cable's GND to the GND on the Arduino? Or do I have to add in an extra optoisolator somewhere?
Many thanks in advance.