BB-CH340T - Open Source Hardware Board

USB to Serial converter with CH340T IC, suitable for breadboarding

USB <-> serial converter with 3.3V or 5V voltage selection (both powering and serial lines)

OSHW design released under Apache 2.0 License

Implements CH340, popular chip with very good driver support from the chip's manufacturer
Fully open hardware design
USB mini connector - USB 2.0 Full Speed compatible
Serial interface with variable baud rate - 50 bps to 2Mbps
Breadboard-friendly - 4 pin 0.1" header
Extracts power from the USB - can provide either up to 80mA@3.3V or up to 450mA@5V
3.3V or 5V output controlled by an SMT jumper - soldered by default to 3.3V
Serial datalines (RXD and TXD) kept at same voltage levels as the selected voltage output
PCB dimensions: (1000 x 1050) mil ~ (25.5 x 26.5) mm