Bottle Cap Keyboard

This is a design for a "Bottle Cap Keyboard", a miniature version of The President's Key.

Although I made this for an Arduino Pro Micro case, it's really a working single-key-board that can be used as a hot-key-board.

Grab any favorite PCO1881 standard bottle cap (most soft drink bottles conform).

I programed it with Cmd+Q(mac) / Alt+F4(pc) for quit from applications but you can change it to any key command.

All design files are licensed as Creative Commons - Attribution - Share-Alike.
The firmware for the Arduino is licensed under the more permissive MIT license.