Drawing with an R/C car

OK this was just too much to not post up.  I can totally see building this simple hack for kids to draw on the street.  Maybe get them interesting in tech too.  Only difference is I think you could get away with an ATiny which would be cheaper than the mini arduino in use.

http://www.instructables.com/id/OpenSquare-Write-big-with-a-RC-car/

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