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Keyboard leds

modern-hobbyist·keyboard-leds

Keyboard leds PCB layout, top view — open source RP2040/RP2350 board by modern-hobbyist

About the Keyboard leds PCB

Keyboard leds is an open source RP2040/RP2350 PCB design by modern-hobbyist, published on GitHub. It is a 2-layer board measuring 87.7 × 51.5 mm, with 55 components from 29 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the W25Q128JVS, XC6206PxxxMR-Regulator_Linear, TFT_320x240, TUSB320 and SN74AHCT1G125DBVR. By type, the board carries 24 capacitors, 14 resistors, 8 ICs, 4 connectors, 2 fuses and 1 crystal.

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

From the project

A custom PCB for reading MIDI output from a keyboard and lighting the respective LEDs.

This project is a custom RP2040-based LED controller designed to add reactive RGB lighting to a piano or MIDI keyboard by reading the incoming MIDI stream and driving high-density LED strips.

This is my second iteration of MIDI-driven keyboard LEDs, but the first time going all in with a fully custom PCB, power-path management, and an onboard touchscreen UI.

⚠️ Status: Work in progress Hardware is under active development, firmware and features are evolving, and this README will be updated as the project matures.

Main components on the Keyboard leds

RP2040W25Q128JVSXC6206PxxxMR-Regulator_LinearTFT_320x240TUSB320SN74AHCT1G125DBVRSRV05-4TPS2121RUXT

Keyboard leds bill of materials (BOM)

55 components, 29 distinct parts.

QtyPartRefs
1
RP2040
U1
1
W25Q128JVS
U2
1
XC6206PxxxMR-Regulator_Linear
U3
1
TFT_320x240
U4
1
TUSB320
U5
1
SN74AHCT1G125DBVR
U6
1
SRV05-4
U7
1
TPS2121RUXT
U8
1
Crystal_GND24
Y1
2
USB_C_Receptacle_USB2.0_16P
J1, J5
1
Conn_01x05
J2
1
Conn_01x03
J4
2
SW_Push
BOOT1, RST1
2
3.0A 1206 Polyfuse
F1, F2
3
330u
C1, C19, C20
1
0.1u
C2
2
22p
C3, C4
3
1u
C5, C6, C9
8
100n
C7, C10, C11, C12, C13, C14, C15, C16
1
10u
C8
Show 9 more
QtyPartRefs
3
100nF
C17, C18, C129
1
0.1uF
C112
2
1uF
C127, C128
7
5.1k
R1, R2, R3, R4, R5, R10, R11
2
1k
R6, R7
2
27
R8, R9
1
665
R12
1
30k
R13
1
10k
R14

Keyboard leds design files

The KiCad project lives in the modern-hobbyist/keyboard-leds repository on GitHub; these links point at the commit this page was built from.

Keyboard leds: common questions

What microcontroller does the Keyboard leds use?

The Keyboard leds is built around the RP2040, from the RP2040/RP2350 family.

How big is the Keyboard leds PCB?

The Keyboard leds measures 87.7 × 51.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keyboard leds?

55 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Keyboard leds design files?

From the modern-hobbyist/keyboard-leds repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Keyboard leds design in my own project?

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

Can I test firmware for the Keyboard leds 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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