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Originally Posted by Jay Lundy
An accelerometer. They are a little expensive and some people have mentioned noise, but I think if you see fast movement in your wheels (slippage) and very little movment (caused by noise) you could interpret that as slippage. If you are moving and slipping at the same time, the noise would affect your reading though. A 2-axis accelerometer could also detect side-movement if you are hit, so it might be beneficial to have one on there anyway.
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Accelerometer is the way to go if you can get it to work. The beautiful thing about acclerometers is that if you're slipping... you don't move. It's as simple as that. Your output voltage won't change, and you won't be tracked as having any movement.
Reduce noise with a little filter...
We're in the process of doing this now. Digikey sells 3-axis accelerometers for $18 I believe.
Matt