Quote:
Originally Posted by Lil' Lavery
If you can't mount a potentiometer on the actual rotation point on the arm there are other solutions. One would be mounting a shaft encoder somewhere else, and running a cable from it to the arm. As the arm moves, it will pull the cable and turn the encoder (essentially a spool or an inverse winch). You can then translate the rotations of the encoder into distance travelled into rotations of the arm.
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Where can we get one of these encoders? Can't encoders only measure distance traveled, or can they measure direction also?