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Or if you prefer it a bit faster: https://www.youtube.com/watch?v=eOJecVKD34g
Nice! Back in 2011 they used to do this with Android phones.

http://youtube.com/watch?v=_d0LfkIut2M

A used cell phone is still usually more capable and cheaper once all the add-ons are factored in.
Nice one. There is a similar project using Mindstorms at http://mindcuber.com , which IMHO is the best Mindstorms project of all.