You put an Arduino-compatible microcontroller on a custom PCB, obviously. A QFN package ATTiny is like 4mm square.
It’ll all be SMT parts if you want it to be watch-sized, so you’ll have to let JLCPCB or whoever assemble the board for you instead of soldering it yourself, but it’s surprisingly accessible to random hobbyists these days.
Arduino
How are you gonna fit an Arduino in a watch?
You put an Arduino-compatible microcontroller on a custom PCB, obviously. A QFN package ATTiny is like 4mm square.
It’ll all be SMT parts if you want it to be watch-sized, so you’ll have to let JLCPCB or whoever assemble the board for you instead of soldering it yourself, but it’s surprisingly accessible to random hobbyists these days.
Yeah I don’t understand any of these words.
Ok, maybe you specifically shouldn’t make your own, but somebody else who knows this things could.
What part of you just DHRT the CNGIR to the WKFI do you not understand?!?
Don’t forget the screen and the battery too.