Lego Mindstorms NXT 2.0
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…and this is what we built. If it sees green it starts firing, and red will make it stop and move away. We’ve also built one with the ultrasonic range finder that will search a room, and fire when it gets within 40cm of something.

1 Comments
November 24th, 2009 at 9:01 pm
It takes a while to recognise the green ball because of the low light. Also, my 5yo took me literally when I said “show the coloured balls to the camera first”.