uPico — RP2040 expansion card
Vitaly's open-hardware card puts an RP2040 microcontroller and a GPIO pinout in the expansion slot for sensors, hats and firmware projects.
What it takes
- Plug & play
- Purchase required
Difficulty 1 of 3 — easy.
Details
The most-liked expansion card on the forum: a Raspberry Pi Pico-class RP2040 on a card that fits the modem slot, exposing GPIO the CM4/CM5 don't route to the outside. Source, PCB design and firmware live on GitHub (CC-BY-SA), and finished boards are sold on Tindie under Quadbit. Other cards, including the oscilloscope concept, build on it.
Links
Open at Forum thread- GitHubRepository
- Tindie — uPicoShop
Related mods
Open-source card with three USB-C ports, an internal FFC USB header and speaker pads, from the maker of uPico.
Zucker's minimal card: a microSD slot, an internal-facing USB port and every GPIO from the PCIe-style connector broken out.
AleReb's card adds more GPIO, a camera connection and several I²C headers, built on PotatoMania's KiCad template.
Plug-and-play KVM: HDMI capture in and USB HID out, so the console becomes a portable crash cart for headless machines.
Zucker's open KVM card based on the yuzuki-hcc HDMI capture design; standard or micro-HDMI input, recessed to fit the case.
A community PCB that replaces the 4G modem with four extra USB ports — schematic and layout on Codeberg.