Fold-Board

Taran-the-Idiot·Fold-Board·pcb/pcb.kicad_pcb

About the Fold-Board

Fold-Board is an open source RP2040/RP2350 PCB design by Taran-the-Idiot, published on GitHub under the MIT license. It is a 2-layer board measuring 176.2 × 100 mm, with 134 components from 5 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. By type, the board carries 66 switches, 66 diodes, 1 IC and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

If you like this project, please give it a star!

YouTube vid: https://youtube.com/shorts/LQNGhtRMvZQ?si=ZyAIBXtM6X78Itwt

Here is a full CAD Build of the keyboard.\ It uses a rubber band to hold the 2 halves together and I am probably gonna have to work on the joint a bit when i get the parts.

The case is 44mm tall when layed flat out which is pretty good for a folding board. I made sure to keep the joint loose but strong enough to stay on so it doesnt wear down as much and stays nice. I suggest printing it from petg so you can get more slip.

Fold-Board, from the project README — From the project README

Main components on the Fold-Board

Pico

Fold-Board bill of materials (BOM)

134 components, 5 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	Pico	RPi_Pico_SMD_TH	U1
1	CONN_01X04_PIN Conn_01x04_Pin	PinSocket_1x04_P2.54mm_Vertical	J1
64	SW_Push	SW_Cherry_MX_1.00u_PCB	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +56
2	SW_Push	SW_Cherry_MX_2.00u_PCB	SW33, SW62
66	D_Small	D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2, D3, D4, D5, D6, D7, D8 +58

Fold-Board design files

The KiCad project lives in the Taran-the-Idiot/Fold-Board repository on GitHub; these links point at the commit this page was built from.

Layoutpcb/pcb.kicad_pcb
Schematicpcb/pcb.kicad_sch
BOMRIGHT PCB/pcbway_production/2025-07-01-18-08-18/pcb.kicad_pcb_bom.csv

Fold-Board: common questions

What microcontroller does the Fold-Board use?

The Fold-Board is built around the Pico, from the RP2040/RP2350 family.

How big is the Fold-Board?

The Fold-Board measures 176.2 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fold-Board?

134 components, from 5 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 Fold-Board design files?

From the Taran-the-Idiot/Fold-Board 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 Fold-Board design in my own project?

Yes, under the terms of its MIT license, which Taran-the-Idiot chose for the repository.

Can I test firmware for the Fold-Board 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.