Linear Actuator Encoder (Windynation)

Allows you to find position on a powerful but cheap linear actuator.
My resolution is 115 positions across 8" but may be able to be improved.

Actuator I used (Tallest one I could make this sensor for on my printer):
https://smile.amazon.com/gp/product/B00P4TS694/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Sensor:HC-020K Double Speed Measuring Module with Photoelectric Encoders For Experiment https://smile.amazon.com/gp/product/B00EERJDY4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I didn't modify it like some people did and it seemed to work for me with an Arduino anyway.