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