4 layers84 × 51 mm
A500-sd plus controller
Mathesar/a500-sd-plus-controller
SD-card plus Ethernet controller for the Amiga 500
84 parts18
2 layers125 × 45 mm
Promatrix-4000-IO
giomf/Promatrix-4000-IO8-output / 7-input digital IO board (RP2040-based) with USB serial control.
- Size
- 125 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 48
- Pads
- 147
- Tracks, vias
- 323, 10
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Jun 2026
- Updated
- 5 Nov 2026
Overview
Promatrix-4000-IO is an open-source printed circuit board by giomf, from the giomf/Promatrix-4000-IO repository on GitHub. It is a 2-layer board of 125 × 45 mm with 30 parts on 48 nets, routed with 323 tracks and 10 vias.
It is built around the PC817X3CSP9F, ULN2803A and R-RJ45R08P-A004, with the JL127-50002G01 and DC050-T among its other parts. Its parts include 14 resistors, 9 ICs and 2 connectors.
Main components
5
PC817X3CSP9F
SMD-4P-30℃~+100℃ 1 1.2V 200mV@20mA,1mA 200mW 3us 4us 50% 50mA 50mA 5kV 600% 6V 80V DC Phototransistor SMD-4P Transistor, Photovoltaic Output Optoisolators ROHSSharp MicroelectronicsTransistor, Photovoltaic Output Optoisolators
ULN2803A
SOP-18-300mil-40℃~+85℃ 0.93mA 100uA 15pF 20uA 30V 500mA 50V 8 SOP-18-300mil Darlington Transistor Arrays ROHSUMWDarlington Transistor Arrays
R-RJ45R08P-A004
弯插0℃~+70℃ 1 12.6mm 15.1mm 15.9mm Gold Harpoon Contact (Plastic) Non-LED Non-PoE Phosphor Bronze RJ45 Jack Right Angle Unshielded Push-Pull Ethernet Connectors / Modular Connectors (RJ45 RJ11) ROHSCkmtwEthernet Connectors / Modular Connectors (RJ45 RJ11)
JL127-50002G01
插件,P=5mm-40℃~+105℃ 1 12A 14~26 1x2P 2 2P 300V 5mm Green M2.5 Through Hole 插件,P=5mm Screw Terminal Blocks ROHSJILNScrew Terminal Blocks
DC050-T
SMD-30℃~+70℃ 1.5A 12V 2mm 6.5mm DC Power Jack Surface Mount, Right Angle SMD DC Power Connectors ROHSSHOU HANDC Power Connectors
README
README.mdPromatix-4000-IO
8-output / 7-input digital IO board (RP2040-based) with USB serial control.
PCB/– KiCad hardware design.promatrix-firmware/– Rust firmware (Embassy), seepromatrix-firmware/README.md.promatrix-protocol/– wire protocol shared between firmware andpromatrix-io.promatrix-io/– host-side Rust library +promatrix-ioCLI, seepromatrix-io/README.md.
Enter the Nix dev shell (nix develop) for the pinned toolchain and tools
used by all three Rust crates.
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10kΩ | PCM_JLCPCB:R_0402 | R8, R9, R10, R11, R12, R13, R14 |
| 7 | 2.2kΩ | PCM_JLCPCB:R_0402 | R1, R2, R3, R4, R5, R6, R7 |
| 7 | PC817X3CSP9F | PC817:OPTO-SMD-4_L4.6-W6.5-P2.54-LS10.3-TL | U1, U2, U3, U4, U5, U6, U7 |
| 4 | R-RJ45R08P-A004 | RJ45:RJ45-TH_R-RJ45R08P-A004 | RJ1, RJ2, RJ3, RJ4 |
| 2 | JL127-50002G01 | 2xTerminal:CONN-TH_2P-P5.08_JL127-50002G01 | CN1, CN2 |
| 1 | DC050-T | DC_PowerJack:DC-IN_DC050-T | DC1 |
| 1 | ULN2803A_C845537 | ULN2803A:SOP-18_L11.4-W7.6-P1.27-LS10.6-BL | U9 |
| 1 | ~ | rp2040-zero:rp2040-zero | U8 |
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Questions
How big is the Promatrix-4000-IO PCB?
It measures 125 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Promatrix-4000-IO use?
30 parts, built around the PC817X3CSP9F, ULN2803A, R-RJ45R08P-A004 and JL127-50002G01. 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 Promatrix-4000-IO KiCad files?
From the giomf/Promatrix-4000-IO repository on GitHub, at the commit this page was made from: the board is PCB/promatrix-4000-io.kicad_pcb and its schematic PCB/promatrix-4000-io.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Promatrix-4000-IO design in my own project?
Its repository states no licence, so its author keeps all rights: ask giomf before reusing the design.