USB-to-RS232 adapter with 12V boost converter for updating FLARM firmware without a bench supply. Open hardware (CERN-OHL-S v2), EasyEDA Pro project, JLCPCB SMT-assembly ready.

Compact CH340C-based USB-to-UART converter PCB designed in KiCad for embedded development, debugging, firmware flashing, and serial communication.

USB to UART breakout board based on the CY7C65213 for reliable serial communication over USB.

Yet another UART to USB sniffer using STM32/HAL.

Serial file transfer between two offline Windows computers.