Tilt Pan Position Feedback for Bescor MP101 Video Motorized Pan Head

Blog entry for this: http://pantonvich.blogspot.com/2017/04/pan-tilt-feedback-control-for-bescor.html

Use gears.scad from:
Cut your own gears with profile shift - OpenSCAD library
http://www.thingiverse.com/thing:636119

Bescor MP101 Video Motorized Pan Head
http://www.amazon.com/Bescor-MP101-Video-Motorized-Head/dp/B008T17W9O

WXD3-13 10K Ohm 2W 4 mm Shaft Diameter 10-Turn Wire Wound Potentiometer
https://www.amazon.com/gp/product/B01CDXMC34

Adafruit Panel Mount 10K potentiometer