4 layers277.2 × 107.5 mm
Katia
ikajdan/katia
A split keyboard with 6 by 3 column staggered keys and 3 thumb keys, based on the Crkbrd design
230 parts33CERN-OHL-P-2.0
2 layers149 × 224 mm
GDEK
GilDev/GDEK3Low-profile, compact, beginner-friendly, assembly-friendly 4×6 with 5-keys thumb cluster ergonomic keyboard with universal keyswitch support, per-key RGB LED, encoder and RP2040 controller. Phew, that’s a lot!
- Size
- 149 × 224 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 324
- Nets
- 242
- Pads
- 1,336
- Tracks, vias
- 2,337, 365
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 8 Feb 2025
- Updated
- 22 Oct 2025
Overview
GDEK is an open-source printed circuit board by GilDev, from the GilDev/GDEK repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 149 × 224 mm with 324 parts on 242 nets, routed with 2,337 tracks and 365 vias.
It is built around the RP2040, 74AHCT1G125SE and W25Q128JVSIQ, with the USBLC6-2P6, XC6210B332MR and SK6812 among its other parts. Its parts include 94 capacitors, 66 diodes, 62 switches, 20 resistors and 10 ICs. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
9
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
74AHCT1G125SE
SOT-353-40℃~+125℃ 1 1 4.5V~5.5V 4.7ns@5V,50pF 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOT-353 Buffers, Drivers, Receivers, Transceivers ROHSDiodes IncorporatedBuffers, Drivers, Receivers, Transceivers
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
XC6210B332MR
SOT-23-5-40℃~+85℃@(Ta) 1 25uA 3.3V 450mV@(800mA) 5.5V 70dB@(1kHz) 800mA Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SK6812
SMD-4P,5.4x5mm-40℃~+85℃ 0.6mA 1.6mm 120° 160mcd~320mcd 1kHz 2000V 280mcd~515mcd 3.7V~5.5V 460nm~470nm 520nm~530nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Built-in power-on reset circuit Semi-transparent lens SMD-4P,5.4x5mm RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
ABM8-272-T3
SMD3225-4P-40℃~+85℃ 10pF 12MHz 50Ω SMD crystal oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
PESD3V3L1BA
--65℃~+150℃ 1 101pF 18A@8/20us 26V 3.3V 500W 6.9V 90nA Bidirectional ESD SOD-323 ESD and Surge Protection (TVS/ESD) ROHSNexperiaESD And Surge Protection (TVS/ESD)
TYPE-C-31-M-13C
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 6.5mm Female Laminated board Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
README.mdGDEK: Your first ergonomic keyboard
Want to try ergonomic keyboards? Don’t know where to start? Don’t want to break the bank yet before knowing what you really want? This may be the keyboard for you.
I created this keyboard following a little crowdfunding campaign I ran for people that were interested in improving their typing comfort but didn’t want to spend too much money on a device they might not like or would like some feature. This keyboard was entirely designed from scratch, after experimenting for some years with a TypeMatrix 2030, a original X-Bows (Kickstarter edition) and a personnal variant of the Sofle Choc RGB.
Features
- 4×6 matrix: you don’t risk missing anything, you can always disable things later on in software to see if missing that top number row would work for you. You can even type in Bépo with minimal modifications!
- Split: optimal hands placement, with room in the middle for a trackball or Magic Trackpad, and a simple audio cable to connect the two halves with connectors that won’t mechanically constrain your cable
- Compact: despite the “full” matrix, it’s easy to bring it along
- 5 keys thumb cluster: enough for anything you could imagine
- Supports MX, Kailh Choc and Gateron KS-33 low-profile switches: I personnaly use KS-33 switches as they’re low-profile, cheap and support standard MX-compatible keycaps
- Per-key RGB: more than just for looks, they can indicate what some keys do, which layer you’re on, etc.
- Encoder: you may think it’s a gimmick, but at least you can try it and see if you like it. I love it to scroll, move the cursor, control volume, etc.
- RP2040: a very cool and powerful microcontroller that will support any features you could image without breaking a sweat. Easy to flash: it appears like a USB drive that you can drag the firmware onto
- QMK firmware with VIA support: easily configurable and customizable via a web app
- Assembly-friendly: send the PCB to be assembled and just solder the switches, encoders and audio TRS jack (pretty easy)
- Open-source: you can modify the design to your liking, design a case and so on
Parts
324| Qty | Value | Footprint | References |
|---|---|---|---|
| 82 | 100nF | Capacitor_SMD:C_0402_1005Metric | C10, C11, C12, C106, C107, C109, C110, C111, C112, C113, C114, C115, C116, C117, C118, C119 +66 |
| 62 | D_Small | Diode_SMD:D_SOD-123 | D1, D10, D11, D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112, D113 +46 |
| 60 | SK6812 | GDEK:SK6812MINIE | LD1, LD10, LD11, LD101, LD102, LD103, LD104, LD105, LD106, LD107, LD108, LD109, LD110, LD111, LD112, LD113 +44 |
| 60 | SW_Push_45deg | GDEK:MX+KailhChoc+GateronKS_Tight | SW1, SW10, SW11, SW101, SW102, SW103, SW104, SW105, SW106, SW107, SW108, SW109, SW110, SW111, SW112, SW113 +44 |
| 6 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R3, R10, R101, R103, R110 |
| 6 | 5.1k | Resistor_SMD:R_0402_1005Metric | R2, R8, R9, R102, R108, R109 |
| 4 | 10µF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C101, C102 |
| 4 | 15pF | Capacitor_SMD:C_0402_1005Metric | C3, C4, C103, C104 |
| 4 | 1µF | Capacitor_SMD:C_0402_1005Metric | C5, C8, C105, C108 |
| 4 | 27 | Resistor_SMD:R_0402_1005Metric | R6, R7, R106, R107 |
| 2 | 10kΩ | Resistor_SMD:R_0402_1005Metric | R4, R104 |
| 2 | 470 | Resistor_SMD:R_0402_1005Metric | R11, R111 |
| 2 | 74AHCT1G125 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U3, U103 |
| 2 | ABM8-272-T3 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1, Y101 |
| 2 | AudioJack4 | GDEK:AUDIO-TH_PJ-320A-4P-DIP | J2, J102 |
| 2 | B5817 | Diode_SMD:D_SOD-323 | D61, D161 |
| 2 | Boot pads | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | B, B |
| 2 | PESD3V3L1BA | Diode_SMD:D_SOD-323 | D62, D162 |
| 2 | Polyfuse | Fuse:Fuse_0603_1608Metric | F1, F101 |
| 2 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U1, U101 |
| 2 | Reset pads | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | R, R |
| 2 | RotaryEncoder_Switch | GDEK:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW31, SW131 |
| 2 | TYPE-C-31-M-13C | GDEK:USB_C_Receptacle_HRO_TYPE-C-31-M-13B | J1, J101 |
| 2 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U4, U104 |
| 2 | W25Q128JVS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U2, U102 |
| 2 | XC6210B332MR | Package_TO_SOT_SMD:SOT-23-5 | U5, U105 |
Questions
How big is the GDEK PCB?
It measures 149 × 224 mm and has 2 copper layers, 1.6 mm thick.
What parts does the GDEK use?
324 parts, built around the RP2040, 74AHCT1G125SE, W25Q128JVSIQ and USBLC6-2P6. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the GDEK KiCad files?
From the GilDev/GDEK repository on GitHub, at the commit this page was made from: the board is pcb/GDEK.kicad_pcb and its schematic pcb/GDEK.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the GDEK design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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