The Olimex USB-to-serial converter uses a CH340 - a popular chip with good software support. The module itself is breadboard-compatible, with four 2.34mm male pins ready to plug into your breadboard. The board uses a micro-USB connection which is USB 2.0 full-speed compatible. It takes power from this USB connection, offering up to 80mA @3.3V or up to 450mA @5V. The 3.3V or 5V output is controlled by an SMT jumper - soldered by default to 3.3V. Need a micro-USB cable? Grab one here! Features * CH340, a popular chip with good software support * Fully open hardware design * USB micro connector - USB 2.0 full-speed compatible * Serial interface with variable baud rate - 50 bps to 2Mbps * Breadboard-friendly - 4 pins 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 data lines (RXD and TXD) kept at the same voltage levels as the selected voltage output * PCB dimensions: (1000 x 1050) mil (25.5 x 26.5) mm Resources Documents * Datasheet * BB-CH340T European Declaration of Conformity * BB-CH340T UKCA Declaration of Conformity Hardware * KiCAD schematic and board files * Schematic Software * Driver installer for Windows * High-speed driver for Linux * Driver for Mac * Driver for Android Package Contents * 1x BB-CH340T USB to Serial Converter https://elecena.pl/product/23769035/olimex-bb-ch340t-usb-to-serial-converter 2023-07-11 https://elecena.pl/product/23769035/olimex-bb-ch340t-usb-to-serial-converter 2023-12-27 https://elecena.pl/product/23769035/olimex-bb-ch340t-usb-to-serial-converter 2024-09-18 https://elecena.pl/product/23769035/olimex-bb-ch340t-usb-to-serial-converter 2024-11-29 https://elecena.pl/product/23769035/olimex-bb-ch340t-usb-to-serial-converter 2024-11-30 https://elecena.pl/product/23769035/olimex-bb-ch340t-usb-to-serial-converter 2025-11-28 https://elecena.pl/product/23769035/olimex-bb-ch340t-usb-to-serial-converter 2025-11-29