Quote Originally Posted by Bill Dufour View Post
I would mount a magnetic switch to the wall and a magnet to the moving stuff. See what burglar alarms use. Or use a lever action proximty switch if you do not want to deal with a contactor etc.
BilL D.

https://www.amazon.com/Baomain-switc...xoClzoQAvD_BwE
I love the concept of using these as limit switches to prevent the hoist from raising the shelf too high, or going too low. But once it cuts the power off, I don't know how you'd get the power back on again to the hoist.

Have to think about how to use this to trigger a light. The down position could vary by about 2-3 feet from the top of the double door to a little over the door knobs where I don't want it to hit.