Corne Cherry Hotswap Split Ergo 40% Keyboard Kit
Designed by Kosuke Adachi (a.k.a. foostan). The designer receives a portion of the proceeds from every sale.
This is version V3.4 modified by 42. Keebs to include a power switch and battery connector for wireless operation and native nice!view support.
Build your very own custom split keyboard from scratch!
- Split 12×3 + 6 (42 keys) 40% ortho/ergo layout
- Supports Cherry MX-compatible switches
- Uses Kailh/Gateron MX hotswap sockets
- Supports in-switch RGB LEDs and RGB underglow (RGB LEDs available as an add-on)
- Optional OLED screens
- Includes a sliding SMD power switch and contacts for a battery on the PCB (no connector needed, battery to be soldered directly to the PCB for simplicity)
- V3.2 PCBs support the 5-column (36-key) layout again (by snapping off the 6th column)
- V3.3 PCBs support the power-efficient nice!view screens natively
- V3.4 PCBs have solder bridges to select various combinations of nice!view and RGB support
- Fairly easy to build – based on Pro Micro controllers, but uses SMD diodes
- Tinned lead-free finish, black solder mask
⚠️💀 Warning: Never plug/unplug the TRRS cable while the keyboard is powered! It could damage the data pin of the controller. 💀⚠️
Build guide in the GitHub repository
Kit contents
- 2x main PCB
- 44x SMD diode (42 + 2 spare)
- 42x Kailh hotswap socket
- 2x TRRS socket
- 2x SMD power switch
- 2x Reset switch
- Brass standoffs and screws
- FR4 version:
- 2x FR4 switch plate
- Optional 3 mm switch plate foam
- Optional 3 mm foam mid-layer
- 2x bottom plate made from PCB material (FR4)
- 2x clear acrylic covers
- FR4 + acrylic version:
- 2x FR4 switch plate
- Optional 3 mm switch plate foam
- Optional 2/3 mm foam/3 mm acrylic mid-layer
- 2x 3 mm acrylic (optionally tenting) bottom plate
- 2x acrylic covers (in a matching colour + clear ones in case of dark/opaque acrylic)
- Acrylic version:
- 2x 3 mm acrylic switch plate
- Optional 2 mm switch plate foam
- Optional 2/3 mm foam/3 mm acrylic mid-layer
- 2x 3 mm acrylic bottom plate
- 2x acrylic covers (in a matching colour + clear ones in case of dark/opaque acrylic)
- 16x acrylic tenting spacers (tenting version only)
Required parts not included in the kit
- 2x Pro Micro compatible controllers (Frood, nice!nano etc.)
- 42x Cherry MX-compatible switches
- TRRS cable (unless using nice!nanos)
Optional parts not included in the kit
- OLED screens
- nice!view screens
- 12x WS2812B/SK6812 (5050) underglow RGB LEDs
- 42x SK6812MINI-E in-switch RGB LEDs
Vincent De Borger (verified owner) –
Very nice kit with all the necessary components. Petr was very helpful trying to figure out what I exactly needed to order.