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Originally Posted by Moloch
Thinking about putting on extra wheels for the soul purpose of counting teeth. This will prevent skid and spinning. Not sure how accurate or phesable this will be though.
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not a bad idea.
the hall effect sensors need to sit really really close to the gears, about 3 mm, right in front of the point where the teeth change from peak to valley.
a good indication would be to move them closer by hand, until you can feel the magnet inside them pulling the you towards the gear.
in order to position them accurately, i would suggest that you use an oscilloscope, that way you have a visual and real-time reference , so you can decide exactly where to put them.