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Another GBC

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Philip Verbeek has sent us through version 4 of his Great Ball Contraption.  We've shown version 2 before and this one follows in a similar style.  With 7 separate 'modules' its impressive, but what truly makes it stand apart is the fact that the whole thing is powered by a single motor.  There is a great implementation of a Geneva Drive towards the end of the video which is worth sticking around for.

As an added bonus, the NXT uses a light sensor to keep track of how many balls have passed through :)



**Update** Here is version 3 :) - http://www.youtube.com/watch?v=slVg6G33taA
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