FTDI Cable for MultiWii Lite Flight Controller This is a basic breakout board for the FTDI FT232RL USB to serial IC. The pinout of this board matches the FTDI cable to work with official Arduino and cloned 5V Arduino boards. It can also be used for general serial applications. This board has TX and RX LEDs that make it a bit better to use over the FTDI cable. You can actually see serial traffic on the LEDs to verify if the board is working. A nice features of this board is a jumper on the back that allows the board to be configured to either 3.3V or 5V. This board ships with default to 5V, but you can cut the default trace and add a solder jumper if you need to switch to 3.3V.