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2 layers253.5 × 88.1 mmSplitKeyboardCAD copy, the printed circuit board in 3D

SplitKeyboardCAD copy

Adi-Ari-17/Split-Keyboard

This is my first time building a full keyboard, although I have built a macropad before. It is a split keyboard, and I am building it to test out connection between two microcontrollers.

Size
253.5 × 88.1 mm
Copper layers
2
Thickness
1.6 mm
Parts
94
Nets
71
Pads
350
Tracks, vias
462, 34
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
6 Apr 2026
Updated
19 Apr 2026

Overview

SplitKeyboardCAD copy is an open-source printed circuit board by Adi-Ari-17, from the Adi-Ari-17/Split-Keyboard repository on GitHub. It is a 2-layer board of 253.5 × 88.1 mm with 94 parts on 71 nets, routed with 462 tracks and 34 vias.

It is built around the 1N4148WT. Its parts include 42 diodes, 42 switches, 4 resistors and 2 ICs. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.

Main components

1

README

README.md

Split-Keyboard

This is my first time building a full keyboard, although I have built a macropad before. It is a split keyboard, and I am building it to test out connection between two microcontrollers.

PCB

This is my PCB for the keyboard, in this photo it is disconnected so I can make the case around it in onshpae.

Screenshot 2026-04-05 at 7 08 44 PM

I know it looks a little messy but I plan on the case being not a thing layer just covering it and acctually giving it a shape.

This is the schmatic for my PCB I used this as a parent page so I can just copy the two halves of the keyboard. Screenshot 2026-04-05 at 7 10 56 PM

This is one of the pages, the left side, but both are identical Screenshot 2026-04-05 at 7 11 12 PM

This the 3d view (it is still not connected)

Screenshot 2026-04-05 at 7 14 44 PM

CAD

I worked on my CAD two seperate times the first time I had the PCB connected and I couldn't figure out a good way to split it so I made a base model

After I splitted it in Kicad I made my case. I paticularly like this design it looks minamilistic, but it also looks kinda unique.

Screenshot 2026-04-09 at 4 59 49 PM

I used a little help from my friend to make this cause I'm not the best at CAD. :)

I also had to make to seperate models cause each of my keyboard sides are different. (heh)

Code

I just used the Zmk method and watched some out of date videos for this one I used a bit of Claude for debugging and finding out what I should plug in where. I also used AI for the keymaps since it is a lot of repeating work

Parts

94
QtyValueFootprintReferences
421N4148WTDiode_SMD:D_SOD-523D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +26
42SW_PushCHOKSOCKET:SW_choc_v1_1.75uSW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +26
22MResistor_SMD:R_0805_2012MetricR2, R4
2806kResistor_SMD:R_0805_2012MetricR1, R3
2BATTestPoint:TestPoint_Pad_D2.0mmTP1, TP3
2GNDTestPoint:TestPoint_Pad_D2.0mmTP2, TP4
2XIAO-nRF52840-SMDModified:modified-XIAO-nRF52840-SMDU1, U2

Questions

How big is the SplitKeyboardCAD copy PCB?

It measures 253.5 × 88.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SplitKeyboardCAD copy use?

94 parts, built around the 1N4148WT. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the SplitKeyboardCAD copy KiCad files?

From the Adi-Ari-17/Split-Keyboard repository on GitHub, at the commit this page was made from: the board is PCB/Other Kicad Files/SplitKeyboardCAD copy.kicad_pcb and its schematic PCB/Other Kicad Files/SplitKeyboardCAD copy.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the SplitKeyboardCAD copy design in my own project?

Its repository states no licence, so its author keeps all rights: ask Adi-Ari-17 before reusing the design.

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