The TinyCircuits TinyLily Mini USB Adaptor adds USB support to the TinyLily Mini via a micro-USB connector. It uses the very popular FTDI USB to serial converter IC used on most standard Arduino models. Connect the board to your PC to download sketches from the Arduino IDE to your TinyLily Mini or add USB communication capabilities to your projects (very useful for debugging too). The board supports the auto-reset function when downloading a new sketch, eliminating the need for a reset button on the processor board. Power is supplied from this board to the TinyLily Mini and there is a jumper option to select either 5 or 3.3V DC (set to 3.3V by default).