uEXB — basic expansion board
Zucker's minimal card: a microSD slot, an internal-facing USB port and every GPIO from the PCIe-style connector broken out.
What it takes
- Plug & play
- Soldering
- Purchase required
Difficulty 3 of 3 — advanced.
Details
Intended as a base for your own internal devices — the example wires a NIC to the internal USB. Schematic, PCB and an EasyEDA Pro project are attached to the thread, with one warning: don't populate the surface-mount USB-A port, or the back panel won't fit.
Links
Open at Forum threadRelated mods
A community PCB that replaces the 4G modem with four extra USB ports — schematic and layout on Codeberg.
AleReb's card adds more GPIO, a camera connection and several I²C headers, built on PotatoMania's KiCad template.
Uses the FPC connector for power and I²C, and the mainboard's unused USB pads for a GL850 four-port hub — Qwiic and solder headers out.
Open-hardware expansion card that brings two USB-A ports to the outside of the case.
Zucker's open KVM card based on the yuzuki-hcc HDMI capture design; standard or micro-HDMI input, recessed to fit the case.
Vitaly's open-hardware card puts an RP2040 microcontroller and a GPIO pinout in the expansion slot for sensors, hats and firmware projects.