SprintBot good for upsetting pets
Running on 4 AA batteries and put together for $75, SprintBot — based on an Instructables Howto — sees in ultrasound and is programmed with Picaxe basic. Its creator, "Casca,' plans to add new features to the puppy-like design. In the meantime, enjoy this video of the original, which was by Clement Fletcher.
SprintBot [Let's Make Robots]

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So I can watch my $75 get stuck on the side of a flat wall?
(I keed, I keed, it looks great...)