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.

Yet another UART to USB sniffer using STM32/HAL.

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

Serial file transfer between two offline Windows computers.