@admin5435 ok thanks. Is it possible then to run a micro for buttons/LEDs and a nano strictly for the for oled screen? And inside the button box have ...

Might be the wrong forum, but will a nano be able to power the OLED, 1 red led, and 17 buttons? In terms of using the simhub communication sketch

@admin5435 thank you for the quick reply. I may upgrade to the mega as I'd like to have buttons as well as the screen.