HardLabs

Hotswap

dededecline·Serendipity·PCB/Hotswap/KiCad/Hotswap.kicad_pcb

Hotswap PCB layout, top view — open source RP2040/RP2350 board by dededecline
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About the Hotswap PCB

Hotswap is an open source RP2040/RP2350 PCB design by dededecline, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 288.9 × 98.4 mm, with 160 components from 24 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the W25Q128JVS, XC6206PXXXMR and PRTR5V0U2X. By type, the board carries 65 diodes, 17 capacitors, 5 resistors, 4 ICs, 2 switches and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Serendipity keyboard designed by @ojthetiny and me.

Photos by group buy participants can be found here!

More info can be found on the Geekhack interest check.

All files required for manufacturing are present in this repository.

All relevant information about the board should be in the Geekhack interest check.

Hotswap, from the project README
From the project README

Main components on the Hotswap

RP2040W25Q128JVSXC6206PXXXMRPRTR5V0U2X

Hotswap bill of materials (BOM)

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

QtyPartRefs
1
RP2040
U1
1
W25Q128JVS
U2
1
XC6206PXXXMR
XC6206PxxxMR
U3
1
PRTR5V0U2X
U4
1
12MHZ
12MHz
Y1
1
SM04B
EZmate
J1
52
MX-NoLED
MX1, MX3, MX7, MX8, MX9, MX10, MX11, MX12 +44
2
MX-NoLED
MX2, MX60
1
MX-NoLED
MX4
4
MX-NoLED
MX5, MX17, MX51, MX64
2
MX-NoLED
MX6, MX63
2
MX-NoLED
MX26, MX59
1
MX-NoLED
MX31
1
MX-NoLED
MX41
1
C318884
Boot
SW1
1
C318884
Reset
SW2
63
C64898
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +55
2
D_Small
D64, D65
2
22PF
22pF
C1, C2
10
C1525
.1u
C3, C5, C6, C9, C10, C11, C12, C13 +2
Show 4 more
QtyPartRefs
4
1u
C4, C8, C16, C17
1
10U
10u
C7
3
1k
R1, R4, R5
2
27
R2, R3

Hotswap design files

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

Hotswap: common questions

What microcontroller does the Hotswap use?

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

How big is the Hotswap PCB?

The Hotswap measures 288.9 × 98.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Hotswap?

160 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 Hotswap design files?

From the dededecline/Serendipity 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 Hotswap design in my own project?

Yes, under the terms of its GPL-3.0 license, which dededecline chose for the repository.

Can I test firmware for the Hotswap 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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