xobdox is a 40%(~ish) split wireless keyboard with a single PCB
design for both halves, featuring side buttons, encoders and configurable
battery options, swappable low profile switches, and powered by ZMK firmware.
- Reversible PCB for left and right halves
- 44/46/48 total switches
- 44 mechanical switches
- 2 optional side push button (one on each side by the thumb)
- 2 optional encoder switch (if encoder installed at ENC2 location)
- Flexible configurations
- 2 encoder locations
- Top mount lipo battery or bottom mount 18350
- 1u or 1.25u key caps on some keys
Other features are quite common in all the other DIY keyboards you can find out there:
- Wireless (BLE) or Wired (USB)
- Ortho-linear (slightly modified) layout
- Hot swappable low profile switches (may add standard MX compatible switch support in the next rev)
- Encoders
- Power switch
Sorry, no RGB/Glow/Backlight/Display support (yet).
One of two locations can be used to install an encoder, though not both of them
can be used at the same time since they share the same GPIO pins.
ENC1 supports installing a knob up to 16mm diameter and ENC2 up to 25mm
respectively.
ENC2 also supports encoders with push button (e.g. EC11)
Battery could be mounted on either side of the board.
If mounted on top, an idea size would be 25mm * 35mm * 50mm, such as a 502535 cell here
If mounted on bottom, an alternative form factor of 18350 can be used, which also
dubbed as the keyboard tilt support
Since there are location conflict between some of the encoder and battery
options, not all combinations of encoder and battery configs are feasible. This
gif shows all feasible ones
Some key caps can use 1.25u/1.5u key caps in addition to the standard 1u size. Those
are located on the edge columns and the last row.
The following gif demonstrated some possible key caps configurations (not
exhaustive)
Note1: 1.5u option only available to the switches on the most right/left column on row 2 and row 3.
Note2: not all key caps on the last row can be 1.25u, specifically, there shall not be any consecutive 1.25u key caps.
Estimated battery life (in months)
| Battery capacity | Central(Left) side | Peripheral(Right) side |
|---|---|---|
| 400mAh | 1.3 | 4.8 |
| 500mAh | 1.5 | 5.7 |
| 1000mAh | 3.1 | 8.5 |
| 2000mAh | 5.1 | 11.3 |
Note Qty is for one board/side, for a complete set of keyboard multiply Qty by 2 accordingly
| Qty | Device | Parts |
|---|---|---|
| 22 | Kailh Choc Socket | S1-S22 |
| 22 | Kailh Choc Switch | S1-S22 |
| 1 | MJTP1117 | S23 |
| 24 | DKS14 | D1-D24 |
| 1 | EC12E2440301* | ENC1/ENC2 |
| 1 | 1825232-1 | SW1 |
| 1 | seeeduino_xiao_ble | U1 |
| 1 | PKCELL LP502535* | Battery |
* Depends on configuration options, different part can be chosen.
This project is a little rushed to make it in time for SeeedStudio Mechanical Keyboard Design Contest(project post) After I gerbered out I realized it shouldn't be too hard to make the switch footprint compatible for both Choc and MX switches, which would (hopefully) make this board more useful. Therefore I am updating the design. And when that's done I will post it here.