I am thinking of creating a remote for my shades using an arduino or raspberry pi. My shades are top down\bottom up, meaning there is a cord on each side. Currently you need to pull the string to the side to unlock the string, then pull up and down like a regular shade.
My plan was to break the locking mechanism so that if you pull the string, the shade goes up (or down) and you need to hold it. I need a pulley and motor so that when it is at the proper setting, the pulley would stop and be able to hold without power.
If I could find a motor like that, I would simply have to go in one direction to pull up, in the other direction to go down, then stop when at the right height.