zmk-config

Keymap

This is a ZMK config repo for my ergonomic keyboards. The keymap is optimized to be usable with 28-30 keys, with dropped keys from inner index and pinky columns and one or two thumb keys each, like the Hummingbird layout. Currently these keyboards are:

• A hand-wired Rommana (30 keys)
• A Rufous (30 keys)
• A hand-wired, modified Grumpy (28 keys)
• Corne-ish Zen (36 keys)

It mainly uses three non-base layers activated through two thumb keys, along with combos. It has Ctrl/Shift thumb hold-taps along with home row mods, which are also available on the left side of NAV layer. FUN layer is implemented as a tri-layer, i.e. it is active when both NAV and SYM are active.

The default alpha layer is a modification of Colemak-DH and an alternative is the Bird layout.

OS-dependent shortcuts are present on the NAV and FUN layers, e.g. for Windows:

• Win Close: AltF4
• Tab Next: CtrlTab
• Tab Prev: CtrlShiftTab
• Tab Close: CtrlF4
• Desk Next: CtrlGuiRight
• Desk Prev: CtrlGuiLeft
• Win Next: AltTab (hold Alt while layer active) using swapper
• Win Prev: AltShiftTab (hold Alt while layer active)

Below representation was generated with keymap-drawer using the automated Github workflow -- check out the drawings for all keyboards in the keymap-drawer folder.

See my QMK userspace for equivalent keymap definitions for QMK, although note that they might not be up-to-date with latest QMK changes.

LED indicators widget

Some keyboards in this repo include an indicator widget utilizing an RGB LED, like the user LEDs on a Xiao BLE. This widget is a ZMK module housed in zmk-rgbled-widget -- check out the repo and the instructions to use it with your keyboards!

ZMK customizations

I use a custom ZMK branch referenced in west.yml which contains display improvements for the Corne-ish Zen. For a variant of my configuration for stock ZMK, check out the stock branch.

My keymap also uses a swapper key for single button window switching, defined using the tri-state behavior module.