4 layers99 × 53.3 mm
PSLab
fossasia/pslab-hardware
PSLab Hardware Design and Schematics https://pslab.io
199 parts1.7kApache-2.0
2 layers427.6 × 139.1 mm
Krunchboard
krunchiekrunch/krunchboard2A custom 80% ISO mechanical keyboard powered by a Raspberry Pi Pico with KMK
- Size
- 427.6 × 139.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 225
- Nets
- 158
- Pads
- 1,231
- Tracks, vias
- 1,203, 78
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Jun 2025
- Updated
- 22 Apr 2026
Overview
Krunchboard is an open-source printed circuit board by krunchiekrunch, from the krunchiekrunch/krunchboard repository on GitHub. It is a 2-layer board of 427.6 × 139.1 mm with 225 parts on 158 nets, routed with 1,203 tracks and 78 vias.
It is built around the 1N4148W. Its parts include 100 diodes, 94 switches, 2 resistors, 2 connectors and 1 IC. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
1README
README.mdNO LONGER UPDATE, CHECK OUT A NEWER VERSION HERE
krunchboard
A custom 80% ISO mechanical keyboard powered by a Raspberry Pi Pico with KMK
Note
Prod V1 of the PCB has its I2C lines flipped for the 0.91" OLED Display and MCP23017
Firmware doesn't work yet
About
I made this keyboard after I designed my macropad, and I thought this would be a fun project to do, I've also never owned a mechanical keyboard so maybe this is a good way to start?
Images
| PCB | 3D View |
|---|---|
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Render
BOM
| Qty | Item | Notes | Cost (USD) | URL |
|---|---|---|---|---|
| 1 | Raspberry Pi Pico | USB-C Clone | 2.30 | AliExpress |
| 1 | EC11 Rotary Encoder | 2.54 | AliExpress | |
| 1 | Rotary Encoder Knob | 0.98 | AliExpress | |
| 92 | Kailh MX Hotswap Socket | Hotswapping for switches | 7.88 | AliExpress |
| 1 | 0.91" OLED Display | 2.06 | AliExpress | |
| 1 | 0.96" OLED Display | 2.18 | AliExpress | |
| 1 | MX Stabilisers Set | For big keycaps | 4.37 | AliExpress |
| 93 | 1N4148W Diode (SOD-123) | Already have | 0.50 | LCSC |
| 1 | MCP23017 GPIO Expander (SOIC-28) | Already have | 1.94 | LCSC |
| 2 | 4 Slot 2.54mm Socket | Already have | 0.43 | LCSC |
| 6 | SK6812MINI-E / SK6812E Neopixel | Already have | 0.74 | LCSC |
| 1 | Keycaps Set | 13.94 | AliExpress | |
| 87 | Linear Key Switch | Main keyboard switches | 9.31 | AliExpress |
| 5 | Tactile MX-Style Switch | Shortcut keys switches | 2.00 | AliExpress |
| 6 | Sticky rubber feet | Antislip for keyboard | 1.26 | AliExpress |
| 12 | M3x5mmx4mm Heatset Inserts (W*H) | For mounting | 2.13 | AliExpress |
| 12 | M3x5mm Screws | For case assembly | 2.44 | AliExpress |
| 1 | Solder Paste | Reflow soldering for SMD | 5.11 | AliExpress |
| 1 | Solder Wire | 50g | 3.32 | AliExpress |
| 1 | 3D Printed Case | print-legion postage (via royal mail) | 7.00 | print-legion |
| 1 | PCB | Shipping $12.89 | 41.79 | JLCPCB |
| Total AliExpress (GBP) | 61.82 | |||
| PCB and Case (GBP) | 48.79 | |||
| Total (USD)** | 103.61 |
Parts
225| Qty | Value | Footprint | References |
|---|---|---|---|
| 94 | 1N4148W | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +78 |
| 79 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_1.00u | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +63 |
| 8 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_1.25u | SW67, SW82, SW83, SW84, SW86, SW87, SW88, SW89 |
| 7 | TestPoint | TestPoint:TestPoint_Pad_D2.5mm | 5V1, GND1, GPA6, GPA7, MCP_INTA1, MCP_INTB1, NEOPIXEL_DOUT1 |
| 6 | LED_SK6812MINI | SK6812-Mini-E Reverse Mounting:SK6812-MINI-E | D95, D96, D97, D98, D99, D100 |
| 4 | LOGO | LOGO | G***, G***, G***, G*** |
| 2 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J1, J2 |
| 2 | KiCad-Logo2_5mm_SilkScreen | Symbol:KiCad-Logo2_5mm_SilkScreen | logo1, logo1 |
| 2 | R4.7k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2 |
| 1 | MCP23017_SO | Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | U1 |
| 1 | RaspberryPi_Pico | Module:RaspberryPi_Pico_SMD_HandSolder | A1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW94 |
| 1 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_2.75u | SW79 |
| 1 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_ISOEnter | SW65 |
| 1 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_1.75u | SW52 |
| 1 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_1.50u | SW35 |
| 1 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_2.00u | SW30 |
| 1 | SW_Push_45deg | ScottoKeebs_Hotswap:Hotswap_MX_Plated_6.25u | SW85 |
The 215 most common of 225 parts.
Questions
How big is the Krunchboard PCB?
It measures 427.6 × 139.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Krunchboard use?
225 parts, built around the 1N4148W. 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 Krunchboard KiCad files?
From the krunchiekrunch/krunchboard repository on GitHub, at the commit this page was made from: the board is kicad-pcb/keyboard/krunchboard.kicad_pcb and its schematic kicad-pcb/keyboard/krunchboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Krunchboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask krunchiekrunch before reusing the design.
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