This project is still being developed as I am polishing the keymap for something I really like. Comments and code might be unstructured or incorrect as changes are implemented.

Controlling my Span, a split wireless-only mechanical keyboard.

• QWERTY base layout
• Modified Miryoku layout
• moved GUI key to lower row due to many false activations
• Added a row of combos and hold/tap delays to make better use of the 36 key layout

The files for the case can be found within the repository. The pcb sits flush to the upper edge of the case. I've added some standoffs to screw the PCB on with M2x4 screws. Ideally you'd use 5 per side, 4 will do just fine as well. Just note that cutouts are for cosmetic purposes only.

Either generate the firmware via the GitHub action, or build locally by setting up the ZMK toolchain as described here. Given a directory structure like:

...
|-- config-temper/
|-- zephyr-sdk-0.16.5-1/
`-- zmk/
    |-- app
    `-- ...

Then from the zmk/app directory run the following command to build the firmware for the left hand board:

west build -b nice_nano_v2 -p -c -- -DSHIELD="temper_left nice_view_adapter nice_view_temper" -DZMK_CONFIG=../../config-temper-zmk/config -DZMK_EXTRA_MODULES=../../config-temper-zmk -DZephyr-sdk_DIR=../../zephyr-sdk-0.16.5-1/cmake

This will produce the file zmk/app/build/zephyr/zmk.utf. Put the board into bootloader mode by pressing the reset button twice, and copy this file to the board, which will show up as a USB drive when connected to your computer. Repeat for the right side board.

The keymap image is created using keymap-drawer. It can be regenerated with the commands:

keymap -c img/keymap_drawer.config.yaml parse -c 10 -z config/temper.keymap > img/temper.yaml
keymap -c img/keymap_drawer.config.yaml draw -k chocofi img/temper.yaml > img/temper.svg

In MacOS, when a key is held down while entering text, a popup is shown which lets you choose between various accented forms of the character. The following command will disable this behaviour.

defaults write -g ApplePressAndHoldEnabled -bool false

• https://github.com/urob/zmk-config
• https://github.com/caksoylar/keymap-drawer