42

42 is an ergonomic keyboard with the following features:

• 40% layout
• handwired
• orthogonal
• Bluetooth enabled

It uses the Feather 32u4 controller, and its layout is defined using the QMK firmware. The case is made of four 3D printed pieces glued together. In this repo you can find all files necessary to build and configure one yourself.

Front

Wiring

Useful resources

• A modern handwiring guide Even if you don't end up putting into practice what's written in this guide, it will definitely be helpful for understanding how things are connected in a keyboard.
• How to build your very own keyboard firmware This guide is really all you need if you're going to make your own firmware. If you want some special functions that are not described there, you can check TMK docs and you'll probably find what you're looking for.
• Keyboard PCB Guide Here you can find most of what you need to know for designing a PCB. You might need to search for some things that are not covered there, like how to create a footprint for a component that is not present in any library. The basics are all covered though.
• /r/MechanicalKeyboards/ A lot of my Google searches ended up on threads from this subreddit, the community seems super helpful, if you're stuck somewhere, this is probably the best place to ask.
• Feather 32u4 Pinout