Musubi - Super thin 38 key split keyboard

Musubi is a 38 key split keyboard using Kailh X switches and Seeeduino Xiao. This keyboard started with dust keyboard as a base and adjusted with customized layout and design elements from my favorite keyboards.

• dust by Hazel
• TOTEM by GEIST
• Dilemma by BastardKB

Currently there are two versions of the keyboard

• V1 (white)
  • a lot more index and pinky column stagger
  • Totem like thumb cluster
• V2 (red)
  • less aggressive column staggers
  • thumb cluster is extended out
  • TRRS socket location moved
  • double puck mount for wider design

Features

• Reversible PCB
• Column stagger with splay
• 3x5 layout with 4 additional keys (three thumb, 1 pinky)
• Slim build ( measured from keycap to bottom )
  • without case 6.7 mm
  • with case 9.7 mm
• Tenting puck support

BOM

Base keyboard:

• Seeeduino Xiao RP2040 (2)
• Musubi PCB (2)
• Kailh X switches (38)
• Kailh X switch keycaps (38)
• Diodes - 1N4148W (38)
• TRRS Jack - PJ 320A 3.5mm (2)
• TRRS cable (1)

Optional parts:

• Musubi case (2, optional)
  • M2 4mm screw (8)
  • M2 nuts - 4mm wide, 1.6mm tall (8)
  • Tenting pucks (2, optional)
  • Manfrotto Pocket Tripod (2, optional)
  • Rubber feet (optional without tenting pucks)

Keyboard design files

V1 files

• V1 PCB
• V1 case

V2 files

• V2 PCB
• V2 case

Firmware

Musubi's firmware is a modified copy of Dilemma's VIA keymap. If you want to just flash the keyboard with default keymap, put the Xiaos in to bootloader mode and copy the included UF2 file

// For Macs
cp -X ./firmware/musubi_default.uf2 /Volumes/RPI-RP2

For those who wish to customize, clone this repo and symlink Musubi firmware to QMK Firmware

ln -s ./firmware/musubi /{your_qmk_firmware_base_location}/qmk_firmware/keyboards/musubi

Adjust the layout and compile/copy the UF2 file into Xiao

qmk compile -kb musubi -km default
cp -X ./firmware/musubi_default.uf2 /Volumes/RPI-RP2

License

This work is licensed under a Creative Commons Attribution 4.0 International License.