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One Up Chuck Keyboard

I haven't had a non-split ergonomic keyboard before, so I thought I'd give one a try, but none of the existing boards had what I wanted. Hence: the One Up Chuck.

One Up Chuck Keyboard

Features

  • 30 key wireless split ergo keyboard with aggressive pinky stagger and splay
  • Seeed Studio XIAO BLE microcontroller (probably also works with the XIAO RP2040)
  • Gateron Low Profile hotswap switches
  • 7mm low-profile "snug sandwich" case with no exposed components on top or bottom
  • RGB LED status visible on the top of the case
  • Wireless-first design using ZMK firmware (including ZMK Studio)
  • PCB designed with ergogen
  • Internal space (5.3 x 22 x 32 mm) for a "large" 502030 250mAh battery
  • Licensed under the CERN Open Hardware License v2
  • All source files available, so you can tweak the design if needed

Design goals

  • Low cost wireless
    • xiao ble is only $10 per controller compared to $25 for the nice!nano
    • Big battery and an option for a dongle, so you can run for months without recharging
  • Ergonomic design for the ultimate comfort
    • each half is angled to match the angle of the hands on the board
    • keys are placed where fingers naturally fall, with no excessive stretching
      • when fingers extend, they splay, so the keys also splay outward to follow the fingers
      • the pinky is shorter than the other fingers, so the pinky keys are placed lower to match, and the top pinky key is traded for a ring finger key
      • the inner column of each hand is reduced to two keys
      • only one thumb key for each hand
    • centrally located rotary encoder knob for easy access to scrolling and volume control
    • includes all source files, so if your fingers are slightly different, with a little work you can adjust the keyboard to fit you exactly
  • Low profile 3D printable case
    • case is only about 7mm high and comes in two separate pieces, each largely flat on one side for easy FDM printing with minimal fuss
    • smaller versions are included for smaller print beds
    • a few different knobs are included so you can get the height that works best for you
    • bumpons are inset into the case 1mm to minimize their height; they add only 1/2mm in height
  • Hotswappable
    • keycaps and switches can be easily removed and exchanged so you can fine tune the feel
  • Electrostatic protection
    • unlike other ultra-low-profile cases, no electronics are exposed on either the bottom or the top of the case
    • on the side of the case, the reset button and power switch are available, and the usb port is accessible

Still in its infancy, but the Build Guide is started.