How to customize and program a TechKeys Business Card for Osu! HD

This video tells you how to compile the program, and program it onto your techkeys business card. It uses an ATMEGA16U2 chip. Files can be found here: avrgcc library: http://www.andybrown.me.uk/wk/wp-content/download-files/avrgcc-4.7.0-avrlibc-1.8.0.zip techkeys source program: https://geekhack.org/index.php?action=dlattach;topic=53378.0;attach=50885 You will need to install Amtel Flip (java required) and Notepad ++. This is all free.