Make sure that the correct board and programmer are selected (Adafruit Trinket 8Mhz and USBTinyISP, respectively – check the instructions on working with the Trinket on Adafruit if you’re new to this). Restart the IDE, and then open the file CmdF1Emulator from the sketchbook. In the Arduino IDE, open the preferences and change the sketchbook folder to be the ‘Arduino’ folder inside the repository that you just downloaded. Checkout Adafruit’s brilliant guide to installing the Arduino IDE for their boards.ĭownload the code from the Cmd-f1-emulator repository on GitHub. Then you’ll need to install the Arduino IDE, and add the Adafruit boards. Solder the switch to the Trinket as in the pictures – you’ll need to break one of the legs off. That’s it! It should be way less than $20. Mini USB to USB-C cable Amazon UK | Amazon US.12mm tactile button Adafruit | Pimoroni (Pimoroni switch also needs cap).Adafruit Trinket (3V or 5V should work, although mine is a 5V).

Of course since I’ve got this working I’ve discovered there’s a weird work-around to get it working on the TouchBar, but it’s still quite a fun device, and you could use it to emulate any key (missing that Escape key, anyone?) I’ve been really frustrated that my favourite keyboard shortcut to toggle display mirroring doesn’t work on TouchBar MacBooks so I’ve made a button that can emulate it!

Adafruit trinket 5v keyboard