Krtkus

An extended 5x12 keyboard with 2 extra keys. The design is intended for ortho layouts with a shifted number row, allowing for the placement of the delete and tilde keys above their usual spots. PCBs are designed in Kicad, case in Blender.

• Low profile
  • Kailh Choc V1
  • Gateron KS-27/KS-33
• QMK/VIA compatible
• Tray mount
• 3D printed case with a 7 degree tilt

To connect the keyboard to usevia.app, the design file has to be manually uploaded in the design tab.

Room for improvement

• Spacebar stabilizer
• Hide MCU on the bottom side and use standard USB port orientation
• Switch plate

Parts

• One of the PCBs:
  • Choc V1
  • KS-33
• Case:
  • STL file
• Arduino Pro Micro
• 61 SMD diodes
• 61 switches
• 61 keycaps
• 5 M2 x 6mm screws

Optional:

• 90 degree Micro-USB cable
• Rubber feet

Kicad

Libraries

Below is a list libraries included in the project. These libraries are not licensed under CC0. Please refer to each specific library for licensing details.

• Scotto Kicad: https://github.com/joe-scotto/scottokeebs/tree/main/Extras/ScottoKicad
• MX V2: https://github.com/ai03-2725/MX_V2
• Gateron 3D models: https://www.gateron.com/pages/3d

Switch grid

Unit	Offset
Switch	19.05
Switch 4	4.7625
Switch 16	1.190625
Switch 64	0.29765625

QMK

Documentation

• info.json reference: https://docs.qmk.fm/reference_info_json

Compiling (Windows)

• MSYS: https://msys.qmk.fm
• Toolbox: https://qmk.fm/toolbox
• Python: https://www.python.org/

Run the compile script:

python qmk_compile.py

Optionally specify a different bootloader:

python qmk_compile.py -bl atmel-dfu

Resetting

Once the firmware is flashed, it provides key combinations to enter bootloader or clear the keyboard's persistent storage.

• LShift + RShift + B - Puts the keyboard into bootloader mode for flashing
• LShift + RShift + C - Reinitializes the keyboard and reverts to the default keymap

Showcase

Left: Choc V1, Right: KS-33

Krtkus vs. Keychron K3 Pro