Programming Puzzle

[billbo911]

Originally Posted by Ether

I understood you perfectly clearly. You need to add code to detect zero crossings. You do that with rate checks. If your sensor reads 0.1 in the current iteration, and it read 4.9 in the previous iteration, then the actual reading is 5.1, not 0.1

Can you work from there, or do you need a more detailed explanation?

Again, how large is the sensor's dead zone? You may need a new sensor.

I believe Ether is alluding to the portion of the rotation where the pot has no reading. Many pots only read in a 270 deg. range. This leaves 90 degrees of rotation unaccounted for. Even continuous rotations pots suffer from some amount of non-sensing.
You may want to look into a absolute position encoder if your pot just doesn't work out.