I’ve got a debug probe connected to my pi pico and started writing some firmware to drive the speaker. Eventually I’ll port it over to the keychain board.

I’ve been curious about writing firmware in rust so I chose to use it for this project. There’s a bit of a learning curve but after a bit of setup I’ve managed to turn on the pico’s on board LED

With the probe I can just run cargo run to build and run on the board, would definitely recommend over using the pico’s BOOTSEL button.