programmer/serial backpack for the atmega328 chip when bread boarding
HackaDay.io project log - https://hackaday.io/project/8474-atmega328-programmerftdi-backpack-board
Blog post - https://facelesstech.wordpress.com/2015/12/09/atmega328-backpack/
Youtube video - https://www.youtube.com/watch?v=iEx4xWTJ0U4