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TT multifloor elevator system

A demonstration of a method for multifloor elevators. The design can be fairly easily expanded on for multiple floors.

features
- 3 floors with buttons to call inside elevator and outside
- soft stop (slows down on approach to floor)
- opening and closing elevator interior door.

Pick it appart and see if you can copy it into your designs!

Possible improvements:
- the push buttons need to be held for half a second or so to ensure all the right gates get a signal, otherwise it will go to a default floor (0) there's probably a way to solve this.
- no exterior doors, could be done if the lift position is subtracted from the set positions and put into a threshold gate, or just put the lift position directly into a threshold gate.

If copying, be aware that the push button inside the logic area is more important than it looks. This delays the signal spike going into the memory register, giving time for the signal which selects the number going in to get there. Each logic gate takes 1 tick to process the information it was previously given, so it takes a few ticks for the numbers to pass through the numerical junction gates. If you add more floors, you may need to add more push buttons linked together inside the logic area to delay the signal further.