How to Program an AT90USB1286/Teensylu/Printrboard with Arduino and USBtinyISP
My first step in loading Marlin RepRap firmware into the Printrboard is to get Arduino to play nicely with it. The method I am going to describe in this article for programming a Printrboard with Arduino will work with the Teensylu or any other device that uses the AT90USB1286 and has an ICSP connector. [...]