Quote:
Originally Posted by GeeTwo
If you are spinning it fast enough (quite likely), you can put the light/dark pattern directly onto the disk, and use a reflective optical sensor. If you do this, use a relatively inexpensive sensor and be ready to replace it, because it'll be located right next to that spinning wheel, and FRC robots have been known to collide with one another or the field elements. On occasion.
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You can also use a $10 hall effect sensor to do the same thing with a magnet. We found this pretty effective this year.