Fidget toys are everywhere these days. A particularly popular type simply puts some keyboard switches on a plate to provide a certain type of clicky satisfaction. [wjddnjsdnd] took that concept a step ...
Use the 6-pin ICSP header on Arduino Nano (best reliability): ICSP Header Location on Nano: ┌─────────────────────────────┐ │ ┌──┬──┐ │ │ │ │ │ ← = Pin 1 ...