That used some type of weird button scanning (not just connecting a pin to ground or ... of the remote he set out to replicate it in his Arduino code. His function called setStateWithDelay takes ...

[Facelesstech] programmed an Arduino Pro Micro to fake controller button presses ... the-go adapter allows the Switch’s USB-C port to connect directly to the Arduino’s Micro-USB port, even ...

Since the Raspberry Pi OS supports the app, well use it to connect the RPi board to the Arduino MCU ... libraries by tapping the Manage Libraries button within the Tools tab.