HardLabs

Karve-Split-Keyboard

oSnwy·Karve-Split-Keyboard·KiCad files/karve-split.kicad_pcb

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

About the Karve-Split-Keyboard PCB

Karve-Split-Keyboard is an open source RP2040/RP2350 PCB design by oSnwy, published on GitHub under the MIT license. It is a 2-layer board measuring 352.7 × 140.2 mm, with 196 components from 15 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the ER_OLEDM0.91_1x-I2C. By type, the board carries 92 switches, 92 diodes, 2 ICs, 2 modules, 2 connectors and 2 fuses.

It belongs with the keyboards and displays & leds designs in this gallery.

From the project

80% Hotswappable split keyboard powered by the Pi Pico, containing OLED screens, rotary encoders, macro keys, and a layout that can snap together to form a full 80% keyboard.

Each side of the keyboard is powered by an Pi Pico with an RP2040. The descision behind the RP2040 was due to the number of GPIO pins. Other options such as the nrf52840 and the RP2040-Zero would've worked well for this project, but the number of GPIO pins wouldn't be sufficient for all the switches and the extra features on the keyboard. The OLED screen is a general 0.91 inch 128x32px screen, with optional footprints for pull-up resistors, and the rotary encoder is a regular EC11 push switch. The switches in the keyboard are wired in a matrix with a diode on each switch. The left side is…

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

Main components on the Karve-Split-Keyboard

ER_OLEDM0.91_1x-I2CRaspberryPi_Pico

Karve-Split-Keyboard bill of materials (BOM)

196 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
ER_OLEDM0.91_1x-I2C
U2, U3
2
RaspberryPi_Pico
A2, A3
2
USB_C_Receptacle_USB2.0_16P
J2, J3
2
500mA
F2, F3
77
SW_Push
SW43, SW44, SW45, SW46, SW47, SW48, SW49, SW50 +69
2
RotaryEncoder_Switch
SW51, SW93
1
SW_Push
SW58
2
SW_Push
SW67, SW110
3
SW_Push
SW75, SW124, SW134
2
SW_Push
SW82, SW117
1
SW_Push
SW85
4
SW_Push
SW89, SW131, SW132, SW133
92
D
D43, D44, D45, D46, D47, D48, D49, D50 +84
2
10uF
C2, C3
2
47R
R5, R6

Karve-Split-Keyboard design files

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

Karve-Split-Keyboard: common questions

What microcontroller does the Karve-Split-Keyboard use?

The Karve-Split-Keyboard is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.

How big is the Karve-Split-Keyboard PCB?

The Karve-Split-Keyboard measures 352.7 × 140.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Karve-Split-Keyboard?

196 components, from 15 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Karve-Split-Keyboard design files?

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

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

Yes, under the terms of its MIT license, which oSnwy chose for the repository.

Can I test firmware for the Karve-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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