HardLabs

Katia

ikajdan·katia·hardware/katia.kicad_pcb

Katia PCB layout, top view — open source RP2040/RP2350 board by ikajdan

About the Katia PCB

Katia is an open source RP2040/RP2350 PCB design by ikajdan, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 277.2 × 107.5 mm, with 192 components from 27 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the W25Q128JVSIQ, SN74LV1T34DBV, USBLC6-2SC6 and NCP1117LPST33T3G. By type, the board carries 46 switches, 46 LEDs, 42 capacitors, 30 resistors, 10 ICs and 4 connectors.

It belongs with the keyboards designs in this gallery.

From the project

A split keyboard with 6 by 3 column staggered keys and 3 thumb keys, based on the Crkbrd design

Katia is a split mechanical keyboard with 6 by 3 column staggered keys and 3 thumb keys, based on the Crkbrd design.

Compared to the original Crkbrd, Katia features 4-layer PCB stackup, which allows for better routing and thus, better signal integrity.

The design is intended to be used with hot-swap sockets for Cherry MX switches. The switches are backlit with individually addressable LEDs.

Katia, from the project README
From the project README

Main components on the Katia

RP2040W25Q128JVSIQSN74LV1T34DBVUSBLC6-2SC6NCP1117LPST33T3G

Katia bill of materials (BOM)

192 components, 27 distinct parts.

QtyPartRefs
2
RP2040
U1, U2
2
W25Q128JVSIQ
U3, U7
2
SN74LV1T34DBV
U4, U8
2
USBLC6-2SC6
U5, U9
2
NCP1117LPST33T3G
U6, U10
2
ABM8-272-T3
Y1, Y2
2
PJ-398A-5A
J1, J4
2
TYPE-C-31-M-13C
J7, J8
2
SMD0603P050TF
F1, F2
44
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +36
2
SW_Push
SW21, SW44
4
TS-1088R-02026
TACTSW1, TACTSW2, TACTSW3, TACTSW4
46
YS-SK6812MINI-E
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +38
2
LKE05D5-B
D1, D2
2
CDBM240L-HF
D3, D4
2
BLM18EG471SZ1D
FB1, FB2
8
1u
C1, C7, C14, C20, C27, C29, C35, C37
4
15p
C2, C3, C15, C16
26
100n
C4, C5, C6, C8, C9, C10, C11, C12 +18
4
10u
C32, C34, C40, C42
Show 7 more
QtyPartRefs
12
10k
R1, R5, R7, R8, R9, R13, R15, R16 +4
4
1k
R2, R10, R18, R25
4
27R
R3, R4, R11, R12
2
0R
R6, R14
2
470R
R19, R26
4
5k1
R20, R21, R27, R28
2
5k6
R22, R29

Katia design files

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

Katia: common questions

What microcontroller does the Katia use?

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

How big is the Katia PCB?

The Katia measures 277.2 × 107.5 mm, has 4 copper layers and is 1.582 mm thick.

How many components are on the Katia?

192 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the Katia design files?

From the ikajdan/katia repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Katia design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which ikajdan chose for the repository.

Can I test firmware for the Katia 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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