HardLabs

Arc-4

Sameer-Kulhari·Arc-4·PCB/Arc-4.kicad_pcb

Arc-4 PCB layout, top view — open source RP2040/RP2350 board by Sameer-Kulhari

About the Arc-4 PCB

Arc-4 is an open source RP2040/RP2350 PCB design by Sameer-Kulhari, published on GitHub. It is a 2-layer board measuring 80.9 × 59.5 mm, with 13 components from 4 distinct parts.

Its main chip is the XIAO-RP2040-DIP, from the RP2040/RP2350 family. By type, the board carries 4 switches, 4 diodes, 4 resistors and 1 IC.

It belongs with the keyboards designs in this gallery.

From the project

This a 4 key macropad made to be used as a game keypad

- 1 × Seeed Studio XIAO RP2040 - 4 × Cherry MX mechanical switches - 4 × Keycaps - 1 × Custom PCB - 4 × resistors - USB-C Cable

Arc-4, from the project README
From the project README

Main components on the Arc-4

XIAO-RP2040-DIP

Arc-4 bill of materials (BOM)

13 components, 4 distinct parts.

QtyPartRefs
1
XIAO-RP2040-DIP
U1
4
SW_Push
SW1, SW2, SW3, SW4
4
L08R5000Q1
D1, D2, D3, D4
4
Resistor
R1, R2, R3, R4

Arc-4 design files

The KiCad project lives in the Sameer-Kulhari/Arc-4 repository on GitHub; these links point at the commit this page was built from.

Arc-4: common questions

What microcontroller does the Arc-4 use?

The Arc-4 is built around the XIAO-RP2040-DIP, from the RP2040/RP2350 family.

How big is the Arc-4 PCB?

The Arc-4 measures 80.9 × 59.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Arc-4?

13 components, from 4 distinct parts. The full bill of materials is listed on this page.

Where can I download the Arc-4 design files?

From the Sameer-Kulhari/Arc-4 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Arc-4 design in my own project?

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

Can I test firmware for the Arc-4 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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