2 layers65 × 30 mm
Rgb to hdmi
hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
36 parts1kGPL-3.0
2 layers91 × 91.6 mm
Krunchpad
krunchiekrunch/krunchpad3A DIY 12 key macropad powered by RP2040 with KMK
- Size
- 91 × 91.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 28
- Pads
- 177
- Tracks, vias
- 145, 2
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Jun 2025
- Updated
- 8 Oct 2026
Overview
Krunchpad is an open-source printed circuit board by krunchiekrunch, from the krunchiekrunch/krunchpad repository on GitHub. It is a 2-layer board of 91 × 91.6 mm with 36 parts on 28 nets, routed with 145 tracks and 2 vias.
Its parts include 13 switches, 12 diodes, 1 IC and 1 connector. It belongs with the keyboards and input boards and the RP2040 boards of this library.
README
README.mdkrunchpad
A macropad powered by RP2040
Images
| Schematic | PCB | 3D Preview | Case |
|---|---|---|---|
 |  |  |  |
 |
Case
| Layout | Layout | Layout |
|---|---|---|
 |  |  |
BOM
| Qty | Item | Notes | Cost (USD) | URL |
|---|---|---|---|---|
| 1 | Seeed Studio XIAO RP2040 | Microcontroller | $8.53 | AE |
| 12 | THT 1N4148 Diode (DO-35 Footprint) | For switch matrix | $0.22 | LCSC |
| 12 | MX-Style Switches | Mechanical key switches | $3.89 | AE |
| 1 | EC11 Rotary Encoder | Volume control | $2.42 | AE |
| 1 | 0.91" OLED Display | $1.63 | AE | |
| 12 | Blank DSA Keycaps | |||
| 5 | M3x5mmx4mm Heatset Inserts (W*H) | For mounting | $1.79 | AE |
| 6 | M3 Screws (5.6mm Max) | For case assembly | $1.53 | AE |
| ------ | ------------------------------------ | --------------------------- | ----------- | --------- |
| 1 | Soldering Iron + Solder | Tools | $18.00 | |
| 1 | 3D Printed Case | Custom enclosure | $3.00 | |
| 1 | PCB | $1.80 | ||
| ------ | ------------------------------------ | --------------------------- | ----------- | --------- |
| 2 | 2.54mm 4POS Header (Included) | OLED Mounting | ||
| 2 | 2.54mm 4POS Socket | OLED Mounting | $0.43 | LCSC |
| 2 | 2.54mm 7POS Header (Included) | MCU Mounting | ||
| 2 | 2.54mm 7POS Socket | MCU Mounting | $0.45 | LCSC |
| 12 | Kailh MX Hotswap Socket (Optional) | Hotswapping for switches | $2.92 | AE |
| ------ | ------------------------------------ | --------------------------- | ----------- | --------- |
Cases
- V1
Simple base plate with slots for heatset inserts
- V1.1
Added holes for the PCB to sit flush with the case where there are THT componants
- V1.2
Added a support knob to support the PCB in the center of the case
- V1.3
Added slots for the socket for the MCU
Removed the curved corners for the holes
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 12 | SW_Push_45deg | dual_hotswap:dual-hotswap_MX | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12 |
| 4 | , , , | ||
| 2 | LOGO | LOGO | G***, G*** |
| 1 | KiCad-Logo2_5mm_SilkScreen | Symbol:KiCad-Logo2_5mm_SilkScreen | logo1 |
| 1 | OLED_128x32 | 0.91-OLED:SSD1306-0.91-OLED-4pin-128x32 | J1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW13 |
| 1 | XIAO-RP2040-DIP | Seeed-XIAO:XIAO-RP2040-DIP | U1 |
The 34 most common of 36 parts.
Questions
How big is the Krunchpad PCB?
It measures 91 × 91.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Krunchpad use?
36 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 Krunchpad KiCad files?
From the krunchiekrunch/krunchpad repository on GitHub, at the commit this page was made from: the board is pcb/prod-v1/krunchpad.kicad_pcb and its schematic pcb/plate-optional/krunchpad-plate.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Krunchpad 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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