2 layers57.3 × 19 mm
2 layers89.1 × 89.1 mm
SP17 PCB
dinobx/sp175Based on the mathematical packing problem: how can you fit a certain amount of unit squares into the smallest possible rectangle? Read more about the packing problem of x squares on…
- Size
- 89.1 × 89.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 22
- Pads
- 145
- Tracks, vias
- 52, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 27 Jun 2025
- Updated
- 27 Jun 2025
Overview
SP17 PCB is an open-source printed circuit board by dinobx, from the dinobx/sp17 repository on GitHub, published under the MIT licence. It is a 2-layer board of 89.1 × 89.1 mm with 26 parts on 22 nets, routed with 52 tracks and 0 vias.
Its parts include 21 switches and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
README
README.mdSP17
SP17 is a silly little macropad inspired on the optimal solution for packing 17 equal squares into the smallest possible bounding square.
Based on the mathematical packing problem: how can you fit a certain amount of unit squares into the smallest possible rectangle? Read more about the packing problem of x squares on https://www.combinatorics.org/files/Surveys/ds7/ds7v5-2009/ds7-2009.html
Details
- 17 keys in the optimal packing solution for 17 squares, with options to opt for 2u vertical or horizontal keys in the bottom corners
- MX-compatible, solder only
- Diodeless
- Pro Micro footprint
- Silicone bumper feet cutout on the bottom
- 0° typing angle
- Features the 40%s community Logo where this project originated from
- The PCB has been prototyped by JLCPCB and confirmed to work using the "SP17 PCB.zip" in production
- The Case was designed and optimized for CNC milling, but is also 3D printable. A CNC'd case has not been prototyped before
- If interest persist a small Groupbuy may be held eventually
License and Disclaimer
This project is released under the MIT License. You're free to use, remix, fork, or manufacture this however you want. I am not responsible for any mishaps if you order the PCB or case as-is, however I am confident that there are no issues with this simple design.
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | MX_SW_solder | PCM_marbastlib-mx:SW_MX_1u | S1, S2, S3, S4, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21 +5 |
| 4 | MX_stab | PCM_marbastlib-mx:STAB_MX_2u | STAB1, STAB2, STAB3, STAB4 |
| 1 | ProMicro | PCM_marbastlib-xp-promicroish:ProMicro_USBup | U1 |
Questions
How big is the SP17 PCB PCB?
It measures 89.1 × 89.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SP17 PCB use?
26 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 SP17 PCB KiCad files?
From the dinobx/sp17 repository on GitHub, at the commit this page was made from: the board is SP17 PCB/PCB.kicad_pcb and its schematic SP17 PCB/PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SP17 PCB 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).
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