4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers102 × 82.7 mm
PISIC
yuburoll/PISIC742-44key row staggered split keyboard with GRIN inspired layout under 102mm pcb
- Size
- 102 × 82.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 64
- Nets
- 55
- Pads
- 680
- Tracks, vias
- 737, 124
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Apr 2026
- Updated
- 29 Apr 2026
Overview
PISIC is an open-source printed circuit board by yuburoll, from the yuburoll/PISIC repository on GitHub, published under the MIT licence. It is a 2-layer board of 102 × 82.7 mm with 64 parts on 55 nets, routed with 737 tracks and 124 vias.
It is built around the SK6812MINI-E. Its parts include 26 switches, 22 diodes, 8 inductors, 2 connectors and 1 IC. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.md
PISIC
42-44key row staggered split keyboard with GRIN inspired layout, under 102mm PCB
The name PISIC means grin in korean, also is korean pun of grin layout of ansic.
Preparation
-
2x pro micro form factor dev board
-
2x PISIC PCB Boards, provided from the repo
-
1x printed case sets, 2 parts total, provided from the repo
-
2x 1.5-1.6T keyboard plates, provided from the repo
-
2x 1.5-1.6T back plates, provided from the repo
-
44x diodes
-
46x Kailh hotswap sockets (or compatibles)
-
24x M2x6 screws, flathead
-
2x PJ320A 1/8(3.5mm) TRRS connector
-
2x 4x4x1.5mm surface mount tact switches (if needed)
-
8x SK6812 Mini or WS2812b Mini (3535) RGB LED (if wanted)
-
1x 1/8(3.5mm) TRRS cable
-
0-2x PCB Mounted 2u Keyboard Stabilizers, normally 1
-
42-44x MX Keyswitches, normally 43
-
8x 10mm bumpon stickers
-
A set of Keycaps
Build Guides and Miscellaneous
there's some notices before the build:
-
You may solder all hotswaps before soldering the dev board.
-
Assemble dev board with 2.5mm height pin headers on back side, assume that components side are faced up.
-
Jump every jumpers on front side.
-
Assemble Case-Plate-Switch first, not Plate-Switch-PCB.
Default Keymap
There are three more layers - Sym, Fn, Pad - which can be noticed by the color legends. ◇ Means Transparent; which uses base keymap.
Holding the color legend key swaps the layer.
Licenses
all codes follow MIT license.
all designs and the hardware board follow CC BY-SA 4.0 license.
If you want to make a commercial product, it would be appreciated if you sponsor some bucks for me.
Parts
64| Qty | Value | Footprint | References |
|---|---|---|---|
| 23 | SW_Push | yubuGadgetsFootpints:MX_Hotswap_FootprintPropertyFix_Guided | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW22 +7 |
| 22 | D | yubuGadgetsFootpints:Diode_TH_SMD_REVERSIBLE | D1, D2, D3, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22 +6 |
| 8 | SK6812MINI | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | L1, L1, L2, L2, L3, L3, L4, L4 |
| 2 | SW_Push | Keebio-Parts:SW_SPST_TL3342 | SW24, SW24 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2 |
| 1 | AudioJack4 | yubuGadgetsFootpints:TRRS-PJ-320A-ReversiblePad | J1 |
| 1 | Conn_01x02_Socket | yubuGadgetsFootpints:Molex_PicoBlade_53048-0210_1x02_P1.25mm_Horizontal_ReversibleThru | J2 |
| 1 | MountingHole_Pad | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | B-1 |
| 1 | MountingHole_Pad | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | B+1 |
| 1 | ProMicro_r | promicroReversiblePad:ProMicro_ReveribleThru_ComponentUp_OuterPad | U1 |
| 1 | SW_SPDT | yubuGadgetsFootpints:SW_SPDT_MSK12C02_Reversible | SW23 |
The 63 most common of 64 parts.
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Questions
How big is the PISIC PCB?
It measures 102 × 82.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PISIC use?
64 parts, built around the 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 PISIC KiCad files?
From the yuburoll/PISIC repository on GitHub, at the commit this page was made from: the board is kicad/pisic.kicad_pcb and its schematic kicad/pisic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PISIC design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).