HardLabs

Split-Keyboard

shreejita56·Split-Keyboard·PCB/KeyBoard.kicad_pcb

Split-Keyboard PCB layout, top view — open source RP2040/RP2350 board by shreejita56

About the Split-Keyboard PCB

Split-Keyboard is an open source RP2040/RP2350 PCB design by shreejita56, published on GitHub. It is a 2-layer board measuring 152.8 × 96.2 mm, with 195 components from 16 distinct parts.

Its main chip is the XIAO-RP2040-DIP, from the RP2040/RP2350 family. Other key parts include the PCA9555D. By type, the board carries 123 diodes, 67 switches, 3 ICs and 2 connectors.

It belongs with the keyboards designs in this gallery.

From the project

SO I made a custom 60 % layout Split Mechanical keyboard which has a rotor encoder at the top for brightness controlee as well . It is based on Xiao rp2040 . As it has very few pins So I had to use 2 Expanders one for each Split . The communication between 2 Splits happens with t

SO I made a custom 60 % layout Split Mechanical keyboard which has a rotor encoder at the top for brightness controlee as well . It is based on Xiao rp2040 . As it has very few pins So I had to use 2 Expanders one for each Split . The communication between 2 Splits happens with the USB-C to USB-C Connection. And We hade intricated per switch LEDs as well . The Split Keyboard have magnets by the side SO that we could join the split and make it a big single keyboard if we want or use it as a split. The PCB was designed on kicad and CAD was done on Fusion . firmware was written in VS-Code. It…

Split-Keyboard, from the project README
From the project README

Main components on the Split-Keyboard

PCA9555DXIAO-RP2040-DIP

Split-Keyboard bill of materials (BOM)

195 components, 16 distinct parts.

QtyPartRefs
2
PCA9555D
U1, U2
1
XIAO-RP2040-DIP
U3
2
USB_C_Plug_USB2.0
P1, P2
2
MX_stab
S2, S3
3
MX_stab
S4, S5, S6
46
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +38
3
SW_Push
SW14, SW45, SW61
1
SW_Push
SW15
1
SW_Push
SW28
1
SW_Push
SW29
2
SW_Push
SW41, SW50
6
SW_Push
SW42, SW43, SW44, SW46, SW48, SW49
1
SW_Push
SW47
1
RotaryEncoder_Switch_MP
SW64
62
1N4148
D1, D2, D3, D4, D5, D6, D7, D8 +54
61
SK6812MINI
D63, D64, D65, D66, D67, D68, D69, D70 +53

Split-Keyboard design files

The KiCad project lives in the shreejita56/Split-Keyboard repository on GitHub; these links point at the commit this page was built from.

Split-Keyboard: common questions

What microcontroller does the Split-Keyboard use?

The Split-Keyboard is built around the XIAO-RP2040-DIP, from the RP2040/RP2350 family.

How big is the Split-Keyboard PCB?

The Split-Keyboard measures 152.8 × 96.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Split-Keyboard?

195 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the Split-Keyboard design files?

From the shreejita56/Split-Keyboard repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Split-Keyboard design in my own project?

The repository has no license, so all rights stay with shreejita56. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Split-Keyboard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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