I am going to apply for masters program for electrical engineering in some US university and I wish to be considered for research assistantship. I have done several small and big electronics projects myself or with my friends. (making a chess playing robot, making your home lights controlled by TV remote, demonstration of active magnetic suspension etc). However, they weren't part of our academic course and I don't have any certificate of doing those projects. Moreover I don't even have documentation for most of them. Should I mention about such projects or would such projects be considered hobbyists type and not worthy for an EE student? If I were to put them in, how would I prove their validity? Even more difficult would be to prove that I did them on my own and not copied some internet projects.