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Originally Posted by MattB703
One thing for you to consider;
What you are talking about with hall effect and magnetic sensors is actually making your own encoder. Instead, you may want to consider purchasing a standard encoder. If you get a quadrature type encoder (most of them are) you can get distance/speed as well as direction. And it is environmentally sealed.
Matt b.
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Yeah, encoders are very robust and much easier to implement than hall effect/magnetic.
These two encoders are reasonably priced, and both perform well (and if you use a IFI controller for some reason, there is code already available);
Grayhill 63R256 and 61K128
One is 256 count per revolution and the other is 128, the price difference is small so I'd go with the 256 unless that is too many counts per second for your processor to handle.
By the way, what robot controller are you using?