Congratulations to Michael Horne! We will be in contact with you. (Note, you have forty-eight hours to respond, or the prize will be forfeited.)
Check out the video below to see the setup of the random number generator using an Arduino. We decided to select three winners, in case we do not receive a response from the first person, etc.
I used a brand new, unopened Arduino Leonardo from my stash and used a graphic LCD screen that was on SBot2. I tried to use the included random function, but the results wouldn't work for the giveaway as randomization is difficult in general. So I came across this other library, which you can access here, TrueRandom. Here is a link to the code used for the random number generator and LCD output.
Thanks again to all who participated. We look forward to offering other giveaways!