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Main board

JesusFreke·lalboard·kicad/main_board.kicad_pcb

Main board layout, top view — open source RP2040/RP2350 board by JesusFreke

About the Main board

Main board is an open source RP2040/RP2350 PCB design by JesusFreke, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 42 × 67 mm, with 56 components from 24 distinct parts.

Its main chip is the C2040, from the RP2040/RP2350 family. Other key parts include the C3040644, C97521, C2685541 and C7519. By type, the board carries 18 capacitors, 17 resistors, 7 ICs, 5 transistors, 4 inductors and 2 connectors.

It belongs with the keyboards designs in this gallery.

From the project

A 3D-printed keyboard inspired by the DataHand

Online viewer for cluster assemblies: - finger - left thumb - right thumb

The overall functionality of the lalboard is obviously heavily based on the DataHand, but I designed all of the specific key mechanisms, etc. from scratch, to be printable on a normal hobby-level FDM printer.

With my DataHand, I never felt like I could get the keys positioned quite right for my hand. So one of my primary focuses with the lalboard was adjustability. Each key cluster can be independently adjusted in all 6 degrees of freedom to some extent.

Main board, from the project README
From the project README

Main components on the Main board

C3040644C2040C97521C2685541C7519

Main board bill of materials (BOM)

56 components, 24 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C3040644
XC6220B331MR
U1
1
C2040
RP2040
U2
1
C97521
W25Q128JVS
U3
2
C2685541
COS724
U4, U5
2
C7519
USBLC6-2SC6
U6, U7
5
C102619
DMG2301L-7
Q1, Q2, Q3, Q4, Q5
1
C9002
Crystal_GND24
Y1
2
C165948
TYPE-C-31-M-12
J8, J9
1
C318884
Reset
SW1
1
C318884
Boot
SW2
4
C668236
CBG201209U500T
FB1, FB2, FB3, FB4
1
C15525
10u
C1
12
C307331
100n
C2, C5, C6, C9, C12, C13, C14, C15 +4
1
C23733
4.7u
C4
2
C307454
1u
C7, C10
2
C1570
30pF
C8, C11
1
C25867
1.5k
R1
2
C11702
1k
R2, R3
1
C25744
10k
R4
2
C25100
27
R5, R6
Show 4 more
QtyPartRefs
1
C25741
100k
R7
1
C25782
390k
R8
5
C4109
2k
R9, R10, R11, R12, R13
4
C25905
5.1k
R14, R15, R16, R17

Main board design files

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

Main board: common questions

What microcontroller does the Main board use?

The Main board is built around the C2040, from the RP2040/RP2350 family.

How big is the Main board?

The Main board measures 42 × 67 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Main board?

56 components, from 24 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 Main board design files?

From the JesusFreke/lalboard 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 Main board design in my own project?

Yes, under the terms of its Apache-2.0 license, which JesusFreke chose for the repository.

Can I test firmware for the Main 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.

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