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Keyboard matrix

kermitsgonnakermicide·Lattice·PCB/keyboard_matrix/keyboard_matrix.kicad_pcb

Keyboard matrix PCB layout, top view — open source RP2040/RP2350 board by kermitsgonnakermicide
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About the Keyboard matrix PCB

Keyboard matrix is an open source RP2040/RP2350 PCB design by kermitsgonnakermicide, published on GitHub. It is a 2-layer board measuring 192.8 × 23 mm, with 131 components from 3 distinct parts.

Its main chip is the XIAO-RP2040-SMD, from the RP2040/RP2350 family. By type, the board carries 128 diodes, 2 connectors and 1 IC.

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

From the project

a modular keyboard(w/ i2c!)

Lattice also comes with three modules(as of now), which are: - a 16 key macropad with an OLED - a 3 slider, two encoder module i'm calling the sliderpad - a 32x4 RGB LED(specifically the WS2812B-2020) matrix that slides in the empty top bit of the keyboard(connected by 2.54 mm pins because I didnt trust the current limits of the magnetic connectors)

Each module features a xiao rp2040 to run everything else on it because its so smol and cute :3

Keyboard matrix, from the project README
From the project README

Main components on the Keyboard matrix

XIAO-RP2040-SMD

Keyboard matrix bill of materials (BOM)

131 components, 3 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
XIAO-RP2040-SMD
U1
2
CONN_01X04_PIN
Conn_01x04_Pin
J1, J2
128
WS2812B-2020
D1, D2, D3, D4, D5, D6, D7, D8 +120

Keyboard matrix design files

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

Keyboard matrix: common questions

What microcontroller does the Keyboard matrix use?

The Keyboard matrix is built around the XIAO-RP2040-SMD, from the RP2040/RP2350 family.

How big is the Keyboard matrix PCB?

The Keyboard matrix measures 192.8 × 23 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keyboard matrix?

131 components, from 3 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 Keyboard matrix design files?

From the kermitsgonnakermicide/Lattice 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 Keyboard matrix design in my own project?

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

Can I test firmware for the Keyboard matrix 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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