Keyboard Hand Grenade

I made this for when you absolutely need to yell on the internet. I've seen many renderings of this online before, but this might be the first actual keyboard hand grenade that works! It has 27 keys (26 roman letters and space) and therefore you may only write in CAPS (as is appropriate). However, I've added a double-tap function, so you can give every key a second function.

Inside is a Teensy-LC in keyboard mode, so it will be recognised by any computer as normal keyboard. I did not use a keyboard matrix, but used a separate I/O pin per key (therefore only 27 keys) due to space issues. The firmware is included to be programmed on the Teensy with Teensyduino.

The keys are made using OpenSCAD from https://www.thingiverse.com/thing:468651

Detonator head and handle are from the combustible Lemon: https://www.thingiverse.com/thing:10718