Impressive. I've been doing some experiments with the Pololu IMU I bought at their black Friday sale, and the math to do that is pretty hairy. I've been working with a single axis, but that requires at least two, plus considering the possibility of rotation on the third.
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No, omni wheels are required for three wheel bots like that. One wheel slipping sideways is how they move.
IMU? That's cheating! Are saying erco can't do that with 3 PINGs? Hmmm... Amy would never even miss her ball...