2 layers99.8 × 49.8 mm
LedArrayDemo
radex/radmatrix
Tiny modular LED matrix. NOTE: Moved to https://code.hackerspace.pl/radex/radmatrix
453 parts2
2 layers50 × 50 mm
KbdShield
radex/radmatrix2Tiny modular LED matrix. NOTE: Moved to https://code.hackerspace.pl/radex/radmatrix
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 10
- Pads
- 44
- Tracks, vias
- 58, 7
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 Mar 2024
- Updated
- 26 Jul 2025
Overview
KbdShield is an open-source printed circuit board by radex, from the radex/radmatrix repository on GitHub. It is a 2-layer board of 50 × 50 mm with 14 parts on 10 nets, routed with 58 tracks and 7 vias.
Its parts include 6 switches and 4 connectors. It belongs with the lEDs and displays boards of this library.
README
pcb/MainBoard/README.mdMain Board
50x50mm microcontroller module, driving LedArrayMux modules. Contains an RP2040 microcontroller, a CAN transceiver, PWM audio output, current sensing, and level shifters to work around LedArrayMux bugs.
Revisions
Rev A
Errata:
- Level shifters are too slow to be useful
- Workaround: decrease pullup values to obnoxiously low ones (100-180Ω); do not use level shifters; increase PIO delays until functional
- CAN receive signal is not level shifted, which exposes RP2040 to a 5V signal
- Workaround: Do nothing; replace with a 3v3 CAN transceiver
- The 431 shunt voltage reference does not work correctly
- Workaround: use main 3v3 regulator for vref
- PWM audio signal filter is suspected to be responsible for poor quality audio
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_CK_KSC6xxJ | SW101, SW102, SW103, SW104, SW105, SW106 |
| 4 | JLCToolingHole | led-matrix:jlcpcb-tooling-hole | H101, H102, H103, H104 |
| 3 | Mechanical | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J101, J102, J104 |
| 1 | DaughterConn | Connector_PinSocket_2.54mm:PinSocket_2x05_P2.54mm_Vertical | J103 |
Questions
How big is the KbdShield PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the KbdShield use?
14 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 KbdShield KiCad files?
From the radex/radmatrix repository on GitHub, at the commit this page was made from: the board is pcb/KbdShield/KbdShield.kicad_pcb and its schematic pcb/DemoBoard1/LedArrayDemo.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the KbdShield design in my own project?
Its repository states no licence, so its author keeps all rights: ask radex before reusing the design.
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