Umbra

skarrmann·umbra·kicad/choc/umbra-choc.kicad_pcb

About the Umbra PCB

Umbra is an open source RP2040/RP2350 PCB design by skarrmann, published on GitHub under the MIT license. It is a 2-layer board measuring 224 × 89 mm, with 32 components from 3 distinct parts.

Its main chip is the Pi Pico, from the RP2040/RP2350 family. By type, the board carries 24 switches and 1 IC.

It belongs with the keyboards designs in this gallery.

From the project

24 key ergonomic keyboard with self-encasing PCB.

Umbra is a 24 key ergonomic keyboard, powered by a Raspberry Pi Pico.

There are enough keys for playing many games with a keyboard. 2D fighting games like Street Fighter was my personal intent for this build.

The board is a simple rectangle for increased sturdiness, which helps when placing the keyboard on your lap.

gerbers: Gerber files for PCB manufacturing graphics: Source assets for PCB silkscreen kicad: KiCad project files (schematics and PCB designs) kicad-libraries: KiCad components and footprints images: Images for project documentation firmware: Firmware files

Umbra, from the project README — From the project README

Main components on the Umbra

Pi Pico

Umbra bill of materials (BOM)

32 components, 3 distinct parts.

Qty	Part	Footprint	Refs
1	Pi Pico	Pi-Pico_SMD	U1
7	Hole_Pad	Mount_M2	H1, H2, H3, H4, H5, H6, H7
24	SW_Push	SW_Choc_Reverse_Cutout	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +16

Umbra design files

The KiCad project lives in the skarrmann/umbra repository on GitHub; these links point at the commit this page was built from.

Layoutkicad/choc/umbra-choc.kicad_pcb
Schematickicad/choc/umbra-choc.kicad_sch

Umbra: common questions

What microcontroller does the Umbra use?

The Umbra is built around the Pi Pico, from the RP2040/RP2350 family.

How big is the Umbra PCB?

The Umbra measures 224 × 89 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Umbra?

32 components, from 3 distinct parts. The full bill of materials is listed on this page.

Where can I download the Umbra design files?

From the skarrmann/umbra repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Umbra design in my own project?

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

Can I test firmware for the Umbra 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.