I once created an elevator for an engineering class. I got an "A" but only because the grader didn't run it long enough before it burst into flames. So you wouldn't want my design.
I made a garage elevator that you loaded your can food on and sent it up stairs. I used a a garage door opener. It worked out fine. A buddy of mine used the same idea to move bedding to the laundry at his motel 3 floors and sears garage door opener
make this c code by keil software . 0 to 4 switch any press. life up or down which button i press it .2 relay are uses .and also stop button in it. display is also ues in show number which floor go . frist 5 button for floor . last is stop .