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> They both come in many types.  I'd suggest using optical for wear
> and tear.  Cars are physically hostile environments and mechanical
> encoders are likely to wear quickly.

Until a few months ago, I also would have suggested optical encoders.
 But recently, I had quite a bad experience with an optical encoder.
It stopped producing proper quadrature outputs.  On one portion of
the rotation, it started to produce glitches rather than a pulse.

I suppose that the likely thing is that it was subjected to
mechanical impact, and the high magnetic field that it was in
couldn't have helped, but having it kick the bucket like that was not
helpful, and we've modified the design to remove it.

- --Brendan

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