This is a minimal code for controlling the position of a continuous rotation servo with Arduino and a potentiometer.

The basic wiring: https://www.arduino.cc/en/Tutorial/Knob

Code:

#1 cont-servo-test.ino

Check the exact middle point (where the servo stops, theorically 1500).

#2 cont-servo-pot-control.ino

Control the servo with a potentiometer (change servoStop if your servo doesn't stop at 1500)

Video demonstration:

https://youtu.be/qKCKjXpQUgU

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DISCLAIMER: Because of the big inaccuracy of these motors, you can't express rotation in degrees and there is no angle feedback; so the positioning will be always very approximate. Any improvement or suggestions would be greatly appreciated!