Projects from the open hardware and open-source community that we follow and recommend — with links to the original project, author and license.
A complete network cable locator / link keep-alive tester that costs about RMB 6 to replicate. Built around the CH32V003 in the SOP-8 package, it wakes on cable insertion, pulses link-activity signals, and drops to a 9 uA deep-sleep state when the cable is unplugged.
A contest entry that automates the whole CH32V003 firmware loop: compile, flash and test on a bench rig driven by a Raspberry Pi Zero 2 W. The target is exercised over CH334F (a WCH USB hub IC) and GPIO reads, so a firmware regression is caught without a human watching a scope.
The community answer to vendor lock-in: a minimal, open-source GCC + Makefile stack for the CH32V and CH5xx WCH RISC-V parts, with no dependency on the vendor IDE. Includes minichlink, a cross-platform flasher that also speaks gdbserver for source debugging.
A USB power meter squeezed into 16 KB of Flash: voltage, current and power readout up to 20 V / 5 A, PD 2.0 pass-through, energy statistics, and a power-history curve on a 0.96-inch OLED — all driven by the 10-cent RISC-V MCU.