Or if you prefer it a bit faster: <a href="https://www.youtube.com/watch?v=eOJecVKD34g" rel="nofollow">https://www.youtube.com/watch?v=eOJecVKD34g</a>
Nice! Back in 2011 they used to do this with Android phones.<p><a href="http://youtube.com/watch?v=_d0LfkIut2M" rel="nofollow">http://youtube.com/watch?v=_d0LfkIut2M</a>
Nice one. There is a similar project using Mindstorms at <a href="http://mindcuber.com" rel="nofollow">http://mindcuber.com</a> , which IMHO is the best Mindstorms project of all.