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
4 layers213.7 × 140.6 mm
Split Keyboard for Hack Club Outpost with dual light sensors, per-key addressable backlighting, integrated RP2040 MCU
- Size
- 213.7 × 140.6 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 205
- Nets
- 175
- Pads
- 732
- Tracks, vias
- 1,932, 484
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 31 Oct 2025
- Updated
- 10 Sep 2026
Overview
MSCKee is an open-source printed circuit board by Creative-Difficulty, from the Creative-Difficulty/mSCKee repository on GitHub. It is a 4-layer board of 213.7 × 140.6 mm with 205 parts on 175 nets, routed with 1,932 tracks and 484 vias.
It is built around the RP2040, OPT3001DNPR and PCA9956BTWY, with the W25Q128JVSIQ, NCP1117LPST33T3G-MS and ABM8-272-T3 among its other parts. Its parts include 77 diodes, 36 switches, 25 capacitors, 20 resistors and 9 ICs. It belongs with the keyboards and input and sensors and measurement boards and the RP2040 boards of this library.
Main components
6
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
OPT3001DNPR
USON-6-EP(2.1x2.1)-40℃~+85℃ 0.65mm 1.8V~3.6V 1.8uA 2mm 2mm 83klx I2C Light Intensity USON-6-EP(2.1x2.1) Ambient Light Sensors ROHSTexas InstrumentsAmbient Light Sensors
PCA9956BTWY
TSSOP-38-EP-40℃~+85℃ 24 31.25kHz 3V~5.5V 4% 57mA Analog、PWM DC-DC Over-Temperature Protection (OTP)、Short-Circuit Protection TSSOP-38-EP LED Drivers ROHSNXP SemiconductorsLED Drivers
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
NCP1117LPST33T3G-MS
SOT-223-20℃~+125℃@(Ta) 1 1.4V@(1A) 12mA 15V 1A 3.235V~3.365V Fixed Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
ABM8-272-T3
SMD3225-4P-40℃~+85℃ 10pF 12MHz 50Ω SMD crystal oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
README
README.mdmSCKee
 |  |
|---|
msCKee is an open source split Keyboard with per-key white backlighting, and two light sensors, adapting to ambient brightness.
It features:
- dimmable white backlighting for every key, programmable to display animations
- two light sensors (one per side) to automatically dim backlight
- Integrated RP2040 MCU IC
- Minimalist aluminium enclosure
- USB-C 2.0 connectivity
- 4 layer board: Signal - GND - 3,3V and 5V split pour - Signal
- RJ9 cable connection between halves
- Cherry MX 5 pin switch compatible
All manufacturing and part costs were covered by Hack Club through their Outpost program (https://outpost.hackclub.com), which I am very grateful for.
Keycaps are custom from Hack Club for Outpost, product photos (top of the README) were taken in Vienna, Austria.
BOM
The JLC BOM covers the majority of expenses:
Total cost of JLCPCB(A):
| Description | Price/Piece | Total Price | Purchase link | Justification |
|---|---|---|---|---|
| JLCPCB manufacturing and PCB assembly | 124.05€ + 22.72€ shipping | 146.77€ | ||
| Cherry MX Red Switch kit | 17.99€ + 11.99€ shipping | 29.98€ | https://shop.cherry.de/cherry-mx2a-rgb-red-switch-kit.html | |
| SP3T Switch: PCM13SMTR | 0.82€ | 5×0.82€ + 5.90€ shipping + 20% VAT = 12€ | https://www.tme.eu/at/details/pcm13smtr/schiebeschalter/c-k/ | No equivalent SP3T switch is available at JLC |
| 1N4148W7F DII SOD-123 diode | 0.05€ | 36×0.05€ + 6.95€ shipping + 20% VAT = 10.5€ | https://www.reichelt.com/at/en/shop/product/small-signal_switching_diode_100_v_300_ma_sod-123-219381 | Diodes for key matrix, mounted on back side of PCB, so not assembled or provided by JLC |
| Total | 199.25€ | |||
| Total (USD) | 232.59USD |
PCB & schematic images
Parts
205| Qty | Value | Footprint | References |
|---|---|---|---|
| 39 | LED_Small | LED_SMD:LED_0603_1608Metric | D39, D40, D41, LD1, LD2, LD10, LD11, LD12, LD13, LD14, LD15, LD16, LD17, LD18, LD19, LD20 +23 |
| 36 | D_Small | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D21, D22, D23, D24, D25 +20 |
| 36 | SW_Push_45deg | ai03-MX_V2:MX-Solderable-1U | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +20 |
| 12 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C5, C6, C7, C8, C9, C12, C17, C23 |
| 10 | BL3P, BL4P, TV2, TV3, TV4, TV5, TV6, TV7, TV8, TV9 | ||
| 10 | MountingHole_2.2mm_M2 | MountingHole:MountingHole_2.2mm_M2 | SH1, SH2, SH3, SH4, SH5, SH6, SH7, SH8, SH9, SH10 |
| 6 | 10k | Resistor_SMD:R_0402_1005Metric | R11, R13, R14, R17, R19, R20 |
| 6 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | TP1, TP2, TP3, TP4, TP5, TP6 |
| 5 | 10u | Capacitor_SMD:C_0805_2012Metric | C13, C16, C20, C21, C25 |
| 3 | 100n | Capacitor_SMD:C_0805_2012Metric | C18, C22, C24 |
| 3 | Polyfuse_Small | Fuse:Fuse_1206_3216Metric | F1, F2, F3 |
| 2 | 15p | Capacitor_SMD:C_0805_2012Metric | C14, C15 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R9, R10 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C10, C11 |
| 2 | 2.2k | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 3k | Resistor_SMD:R_0402_1005Metric | R12, R18 |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | 4P4C | Connector_RJ:RJ9_Evercom_5301-440xxx_Horizontal | J2, J3 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R7, R8 |
| 2 | BreakLine_11h_D0.5mm_P0.85mm | Panelization:BreakLine_11h_D0.5mm_P0.85mm | BL1, BL2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D19, D20 |
| 2 | NCP1117LPST33T3G | NCP1117LPST33T3G:SOT230P700X175-4N | U3, U5 |
| 2 | OPT3001DNPR | OPT3001DNPR:SON65P200X200X65-7N | U4, U7 |
| 2 | PCA9956BTWY | PCA9956BTWY:HTSSOP38_4P4X9P7_NXP | IC1, IC2 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_TL3342 | OSW1, OSW2 |
| 1 | 10u | Capacitor_SMD:C_0402_1005Metric | C19 |
| 1 | 330 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R16 |
| 1 | 470 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R15 |
| 1 | ABM8-272-T3 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | MCP23017T-E/ML | MCP23017T_E_ML:QFN28_6x6MC_MCH | U6 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U2 |
| 1 | SW_SP3T | Button_Switch_SMD:SW_SP3T_PCM13 | OSW3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J4 |
| 1 | W25Q128JVSIQ | W25Q128JVSIQ:SOIC127P790X216-8N | U1 |
Questions
How big is the MSCKee PCB?
It measures 213.7 × 140.6 mm and has 4 copper layers, 1.6 mm thick.
What parts does the MSCKee use?
205 parts, built around the RP2040, OPT3001DNPR, PCA9956BTWY and W25Q128JVSIQ. 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 MSCKee KiCad files?
From the Creative-Difficulty/mSCKee repository on GitHub, at the commit this page was made from: the board is pcb/mSCKee.kicad_pcb and its schematic pcb/mSCKee.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MSCKee design in my own project?
Its repository states no licence, so its author keeps all rights: ask Creative-Difficulty before reusing the design.
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