[enachb]

This. I have had a gravity based door mechanism for 2 years and eventually your door gets jammed. I started with one limit switch and calibrated number of turns, but even that over time started to get into weird conditions.

Cheap linear actuators from Amazon with built in limit switches are the way to go IMHO: https://www.amazon.com/ECO-LLC-Actuator-Mounting-Brackets/dp...