2 layers251 × 148.4 mm
2 layers217.6 × 150 mm
Split left
dipa-cotton/splitmy split keyboard!
- Size
- 217.6 × 150 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 199
- Nets
- 183
- Pads
- 676
- Tracks, vias
- 2,586, 642
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 4 Aug 2026
- Updated
- 24 Aug 2026
Overview
Split left is an open-source printed circuit board by dipa-cotton, from the dipa-cotton/split repository on GitHub. It is a 2-layer board of 217.6 × 150 mm with 199 parts on 183 nets, routed with 2,586 tracks and 642 vias.
It is built around the PCF8574AP and SK6812MINI-E. Its parts include 80 diodes, 50 capacitors, 42 switches, 17 resistors and 7 connectors. It belongs with the keyboards and input boards and the ESP8266 and nRF52 and nRF5x boards of this library.
Main components
2
PCF8574AP
DIP-16-40℃~+85℃ 100kHz 10uA 2.5V~6V 25mA 300uA 8 8 Cascade and address expansion、Built-in LED driver I2C Interrupt Output Quasi-bidirectional output DIP-16 I/O Expanders ROHSHGSEMII/O Expanders
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
README
README.mdsplit
my split keyboard!
journals
https://stardance.hackclub.com/projects/28331 check out stardance for my journals!
purpose
i wanted to make a keyboard that tracks biometric data, like heart rate, temperature, and other things using multiple sensors :) it also has a LOT more keys than your average keyboard, and will be a lot more comfortable to use.
components
the main files are my PCB and Schematic made in kicad, and I have directories of my code as well :)
BOM
- 100 capacitors
- 100 diodes
- 100 SK6812minis
- 2 XIAO-nRF52840-Plus-SMD
- 2 Olimex_MOD-WIFI-ESP8266-DEV
- 95 SW_Push (cherry mx switches)
- 2 max30102
- 2 tmp102
- 8 FSR
- 2 GSR
- 2 rotary encoders
pictures
right side:
Parts
199| Qty | Value | Footprint | References |
|---|---|---|---|
| 47 | C | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C11, C12, C13, C14, C21, C22, C23, C24, C25, C26, C27, C28 +31 |
| 40 | 1N914 | Capacitor_SMD:C_0603_1608Metric | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +24 |
| 40 | SK6812MINI | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D106, D107, D108, D109, D116, D117, D118, D119, D120, D121, D122, D123, D136, D137, D138, D139 +24 |
| 40 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +24 |
| 17 | R | Capacitor_SMD:C_0603_1608Metric | R1, R2, R3, R4, R5, R6, R7, R8, R10, R12, R17, R19, R21, R22, R23, R29 +1 |
| 5 | Conn_01x02_Pin | TestPoint:TestPoint_Bridge_Pitch2.54mm_Drill1.0mm | J1, J2, J3, J5, J9 |
| 2 | 100 picof | Capacitor_SMD:C_0603_1608Metric | C102, C103 |
| 2 | RotaryEncoder_Switch_MP | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW96, SW97 |
| 1 | 100nf | Capacitor_SMD:C_0603_1608Metric | C101 |
| 1 | Conn_01x05_Pin | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J11 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J13 |
| 1 | Olimex_MOD-WIFI-ESP8266-DEV | Module:Olimex_MOD-WIFI-ESP8266-DEV | U4 |
| 1 | PCF8574AP | Package_DIP:DIP-16_W7.62mm | U1 |
| 1 | XIAO-nRF52840-Plus-SMD | Seeed:XIAO-nRF52840-Plus-SMD | U6 |
Questions
How big is the Split left PCB?
It measures 217.6 × 150 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Split left use?
199 parts, built around the PCF8574AP and SK6812MINI-E. 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 Split left KiCad files?
From the dipa-cotton/split repository on GitHub, at the commit this page was made from: the board is left/split left.kicad_pcb and its schematic left/split left.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Split left design in my own project?
Its repository states no licence, so its author keeps all rights: ask dipa-cotton before reusing the design.
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