I met a girl with a mecanum wheel robot she made in highschool for a FIRST competition. She wished to turn said robot into a Power Wheels Racer.
This is the code that powered the Racer.
Video:
https://www.youtube.com/watch?v=HZxuFrH6i6Y
http://www.makerfaireorlando.com/exhibit/clever-girl-power-racer/
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(_.-.'O'-'. "Deinonychus"