Design Elevator

Use cases

1. Elevator has buttons inside cabin to select desired floor
2. Each floor has buttons to call the lift to go floors above and a floor below respectively
3. Buttons will illuminate indicating the request has been accepted
4. Button will stop illuminating once it serves the user request
5. Elevator will move up/down based as per instruction
6. Elevator will open/close door

Design

Credits

1. Quora