I am looking to build a 3 floor working model elevator using relays and limit switches. Not worried about doors opening and closing or variable speed, just a simple 3 floor up/down operation. A 2 floor diagram is quite easy, however adding a 3rd floor makes it that much more challenging using relays. Does anyone have a simple relay diagram they could share? I'd like to have an "up" call button on the 1st floor, an "up" and "down" call button on the 2nd floor, and a "down" call button on the 3rd floor. There would be an external panel of three buttons to represent the panel inside the elevator car for floors 1, 2 & 3. Put your thinking caps on, and please.... keep it simple!!