If you enable usb tethering on G5 you will create a ethernet device that can be used
to comunicate g5<->arduino
With that you can make a tcp/ip comunication between both
Is that viable for your config?
hoho, great idea, i havent think about that, and btw its worth to try, btw,
i am still curious about using accessory mode in G5

thx u mota 4 your idea
