The TinyLily Mini USB Adapter adds USB support for the TinyLily Mini via a micro-USB connector and uses the very popular FTDI USB to Serial converter IC (as used on most standard Arduino models). A small 5-pin plug allows connection to the TinyLily Mini programming header. Using this board allows you to download new sketches via the Arduino IDE to your TinyLily Mini, and also allows you to add USB communication capabilities to your projects.
This board also uses the DTR line from the FTDI IC to support the auto-reset function when a new sketch is downloaded to the processor – eliminating the need a reset button on the TinyLily Mini.
Power is also supplied from this board to the TinyLily Mini, and there is a resistor jumper option on the board to select either 5 Volts or 3.3 Volts (this is set to 3.3V by default).