2 layers228.6 × 100 mm
Mongus48
ChrisChrisLoLo/beyblock20
The magnetic, modular, 20-key macropad that can join together to form an ortholinear board
124 parts335GPL-3.0
2 layers144.5 × 87.5 mm
Keychu
dialgorithm/keychuxiao esp32s3 based wireless corne split kb with oled display. 42 keys, standard corne layout.
- Size
- 144.5 × 87.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 124
- Nets
- 102
- Pads
- 390
- Tracks, vias
- 1,173, 82
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Jun 2026
- Updated
- 22 Jul 2026
Overview
Keychu is an open-source printed circuit board by dialgorithm, from the dialgorithm/keychu repository on GitHub. It is a 2-layer board of 144.5 × 87.5 mm with 124 parts on 102 nets, routed with 1,173 tracks and 82 vias.
Its parts include 22 switches, 21 diodes, 2 resistors, 2 ICs and 2 connectors. It belongs with the ESP32 boards of this library.
README
README.mdkeychu
xiao esp32s3 based wireless corne split kb with oled display. 42 keys, standard corne layout.
Schematics + PCB
Designed using KiCad.
| Schematic | PCB Layout | 3D PCB |
|---|---|---|
 |  |  |
CAD
I am using cnc'd acrylic transparent sheets to keep a minimal and clean look.
| Top View | Side View | Bottom View |
|---|---|---|
 |  |  |
BOM
you can find the detailed bill of materials here
Parts
124| Qty | Value | Footprint | References |
|---|---|---|---|
| 50 | SolderJumper | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2, JP10, JP11, JP12, JP13, JP14, JP15, JP16, JP17, JP18, JP19, JP20, JP21, JP22, JP23 +34 |
| 21 | D | Diode_SMD:D_SOD-123 | D1, D2, D3, D4, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21 +5 |
| 21 | SW_Push | lib:SW_MX_reversible | SW1, SW2, SW3, SW4, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21 +5 |
| 10 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10 |
| 2 | 100k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | XIAO-ESP32-S3-SMD | Seeed_Studio_XIAO_Series:XIAO-ESP32-S3-SMD | U1, U2 |
| 2 | dialgorithm | dialgorithm:dialgorithm | dialgorithm, dialgorithm |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | BAT1_GND | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP61 |
| 1 | BAT1_VBAT | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP59 |
| 1 | BAT2_GND | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP60 |
| 1 | BAT2_VBAT | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP62 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J1 |
| 1 | Conn_01x04 | lib:oleddisplay | J2 |
| 1 | DISP1_GND | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP51 |
| 1 | DISP1_SCL | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP55 |
| 1 | DISP1_SDA | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP57 |
| 1 | DISP1_VCC | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP53 |
| 1 | DISP2_GND | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP58 |
| 1 | DISP2_SCL | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP54 |
| 1 | DISP2_SDA | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP52 |
| 1 | DISP2_VCC | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP56 |
| 1 | SW_SPST | Button_Switch_THT:SW_Slide_SPDT_Straight_CK_OS102011MS2Q | SW22 |
Questions
How big is the Keychu PCB?
It measures 144.5 × 87.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keychu use?
124 parts. 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 Keychu KiCad files?
From the dialgorithm/keychu repository on GitHub, at the commit this page was made from: the board is KiCad/keychu.kicad_pcb and its schematic KiCad/keychu.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keychu design in my own project?
Its repository states no licence, so its author keeps all rights: ask dialgorithm before reusing the design.
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