HardLabs

DELPHI kbd

JRiggles·DELPHI-kbd·DELPHI/DELPHI kbd.kicad_pcb

DELPHI kbd PCB layout, top view — open source RP2040/RP2350 board by JRiggles

About the DELPHI kbd PCB

DELPHI kbd is an open source RP2040/RP2350 PCB design by JRiggles, published on GitHub under the MIT license. It is a 2-layer board measuring 237.5 × 80 mm, with 86 components from 3 distinct parts.

Its main chip is the Adafruit QT Py RP2040, from the RP2040/RP2350 family. By type, the board carries 42 switches, 42 diodes and 2 ICs.

It belongs with the keyboards designs in this gallery.

From the project

Dual Ergolinear Low-Profile Human Interface

Hardware v1.0.2, Software v1.2.0 © 2022-25[^1]

Current version runs the latest KMK as of July 13th '25, and CircuitPython version 9.2.8

[^1]: Hardware/software versions will (try to) adhere to SEMVER. It is my intention that hardware and software which share a MAJOR version will be compatible with one another (e.g., hardware version 1.2.3 will still be compatible with software version 1.0.0)

DELPHI kbd, from the project README
From the project README

Main components on the DELPHI kbd

Adafruit QT Py RP2040

DELPHI kbd bill of materials (BOM)

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

QtyPartRefs
2
Adafruit QT Py RP2040
U1, U2
42
SW_PUSH_45DEG
SW_Push_45deg
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +34
42
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +34

DELPHI kbd design files

The KiCad project lives in the JRiggles/DELPHI-kbd repository on GitHub; these links point at the commit this page was built from.

DELPHI kbd: common questions

What microcontroller does the DELPHI kbd use?

The DELPHI kbd is built around the Adafruit QT Py RP2040, from the RP2040/RP2350 family.

How big is the DELPHI kbd PCB?

The DELPHI kbd measures 237.5 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the DELPHI kbd?

86 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 DELPHI kbd design files?

From the JRiggles/DELPHI-kbd 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 DELPHI kbd design in my own project?

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

Can I test firmware for the DELPHI kbd 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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