KiCad boards from 6 GitHub repositories tagged “usb-serial”, the most starred first; open any of them in PCBKit.
TheYoctoJester/dutler
A bench butler for your Device Under Test: turns a Raspberry Pi Pico into a USB-serial console bridge with power-relay and MOSFET strap/reset control for embedded-Linux bring-up and hardware-in-the-loop.
xunker/panasonic_typewriter_interface
Allows USB printing to Panasonic KX-R/RK-T/RK-H typewriters, KX-W word processors, and KX-W55 printer. Emulates KX-R60 (working) and RP-K100/RP-K105 (in development) interface adapters
Jana-Marie/USB-UART-BRIDGE
USB-UART-BRIDGE & ESP programmer featuring tag-connect
Boardoza/Boardoza_CY7C65213_USB_to_UART_Breakout_Board
USB to UART breakout board based on the CY7C65213 for reliable serial communication over USB.
pozsarzs/mini_serial_console-hw
Mini serial console with 20x4 LCD, six buttons and three different serial ports
TheYoctoJester/dutler
A bench butler for your Device Under Test: turns a Raspberry Pi Pico into a USB-serial console bridge with power-relay and MOSFET strap/reset control for embedded-Linux bring-up and hardware-in-the-loop.
xunker/panasonic_typewriter_interface
Allows USB printing to Panasonic KX-R/RK-T/RK-H typewriters, KX-W word processors, and KX-W55 printer. Emulates KX-R60 (working) and RP-K100/RP-K105 (in development) interface adapters
xunker/panasonic_typewriter_interface
Allows USB printing to Panasonic KX-R/RK-T/RK-H typewriters, KX-W word processors, and KX-W55 printer. Emulates KX-R60 (working) and RP-K100/RP-K105 (in development) interface adapters