Design Elevator

[Rebbeca Schulke]

Thereare many criteria to consider that can affect escalator or elevator design. Schindler Plan guides you through intuitive steps to determine the mobility solution that best fits your needs. The online design tool asks job-specific questions regarding:

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Although there is no right answer, one should follow the SOLID principles to make the design. SOLID principles are a set ofgolden rules used by object-oriented developers. SOLID principles consist of (reference to educative.io):

As shown above, I have giving one example run of my code. In the example, there are two people inside of the elevator thatwant to go to floor 5 and 3. A person outside the elevator at floor 4 wants to go to floor 0. And two people inside ofthe elevator want to go to floor 1 and 2.

We expect the elevator up first and stop at floor 3 and 5. Then, the elevator to go down and stop at floor 4 to pick upthe person outside the elevator. Then, the elevator should keep going down and stop at floor 2, 1, and 0 respectively.

This is a simple design that can be completed within an interview. There are many more things to consider in a productioncode, but for a temp solution, I think this suffices. This is just my solution, and the link to the code is here -> Elevator. I am sure that there are many better designs out there. I hope this helps with your interview preparation!

For the next short film I am working there is an old elevator in an apartment building. It's so old that it still have one of those elevator gates on it. Does any one have any ideas on how to design an elevator moving?

Consider finding an elevator to record. There are still plenty of elevators like that around (at least here in the UK) if you know where to look. Hotels, restaurants and shops with basement storage are good places to try. If you find one, record it and its component parts. Gates opening and closing, elevator running, buttons etc - you might as well record everything if you are putting the effort in to go there. Edit the sounds together, then add in any extras you think it needs. Pay attention to the small things like creaks and groans from the motor and cables, as that kind of stuff can really add atmosphere to a sequence.

Let's say you don't have any recordings and you can't find an elevator to record. Then you design one from component parts. Break the sound down in layers, stuff like motor running, motor start, gate open and close, button presses, creaks, chimes etc. Find sounds for each element and then get it to work however you can. There is nothing to say your elevator motor sound needs to come from a recording of an elevator. Sometimes this can be the best route to take anyway, it just depends on the style of film, setting etc. If you are working with individual elements, you actually have more freedom to manipulate them than if everything is baked in to one file. For example, weight and size of elements such as the motor can be adjusted to some degree by adjusting pitch or adding in extra pitch layers. What is appropriate will depend on the story, so consider that first.

Create the engine mechanism using industrial motor sounds from a library. Look especially for engine start and engine stop sounds. These type of engine sounds usually come with a nice reverb because of the facility they were recorded in. It may help a natural feeling of a large building space. If the shot is very close for a reverb, you can also combine those with some servo motors recorded closely.

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Anyway, after the interview was over, I wondered what kind of a system I would actually be happy about committing to a source repo if I was actually tasked to come up with it at work. And thus, I began going down a rabbit hole of designing the components of a building elevator system with details all the way down to the button, light, and motor controls :/

Nope! If we did that, 1. we would introduce a circular dependency and tightly couple the interfaces. 2. ElevatorShaft composes an Elevator, thus needs to know about IElevator. However, Elevator need not know about IElevatorShaft.

We still want the callbacks to happen but have the objects be loosely coupled. One way to achieve the necessary communication and still maintain decoupling between the interfaces is through the Delegate Pattern. i.e, IElevator would communicate with an IElevatorDelegate for its back and forth communication needs. In the concrete implementation, the same object (the concrete ElevatorShaft instance) will satisfy the needs of both the IElevatorShaft and IElevatorDelegate, but the interfaces are not coupled. This might not seem that important, but it helps a lot with testability where we can pass different fake and mock those methods independently.

You're using inappropriate types. A long is a poor representation for an instant of time. Why do you have int to represent floors in some cases and char to represent them in other cases? Be consistent.

Saikrishnan Srivatsan wrote: If you're using a Queue for stops, how are you going to insert a stop when it turns out that inserting a stop is more efficient than adding the stop at the end of the queue?

I would use a strong type to represent a floor. It will make your code much nicer to read, and you can also use it to represent levels that aren't associated with a number. Just this morning I stepped in an elevator that had the levels -1, E, L, 1, 2, 3, ...

I think the RequestDirection enum is useless. Instead of telling an elevator to move in a specified direction, just let it move closer to the next scheduled stop.

Why does ElevatorRequest have private setters? If the properties are intended to be read-only, remove the setters completely. Same goes for all your other classes.

The RequestTime parameter of the ElevatorRequest doesn't follow naming conventions. Start it with a lower-case letter.

What is the purpose of a Button? It looks like a useless wrapper around a floor ID. And what is the purpose of a ButtonPanel? Why not just call the ElevatorRequest constructor directly?

Why does an elevator need an ID?

The name 'capacity' does not clearly indicate whether it concerns weight or volume.

Property names should start with a capital letter.

I wouldn't use a PriorityQueue to hold your scheduled stops, because you will never be able to schedule stops in the opposite direction until the queue is completely empty. A simple List will do. Besides, I don't think PriorityQueue is a standard class in the .NET API.

Don't let a class react to events that it raises itself. Just call a method directly from the place where the event is raised.

SetElevatorRequest is a really poor name. Name it something like RequestRide instead.

Maybe it's just me but in an interview setting, say with a time limit of a couple of hours, I wouldn't be looking for that much as an evaluator. In fact, if you came to me with that much "design," I'd be scared. I'd have to ask myself what kind of complex monstrosities would everybody have to deal with if we hired someone who could come up with all that in just a couple of hours? But again, it's just me. To others, having all that might be impressive but for me, simple is better.

It is important for us to visit your premises and understand what are your capacities so to be able to build on your strengths and knowledge while integrating you as closely as possible to the development process.

We can work together with you to help you define your strategy through the use of strategic design methodology, you have all the knowledge in your field and markets, we have tools and methods that can help you bring a new light on it.

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Thinking about a course you are planning or redesigning for the new academic year, how might you complete the following pitch in a way that helps students understand the value of the course to you and to them in their education?

I personally don't find them confusing. Based on own stress situations (someone running to the door trying to catch the lift in time while me figuring out the correct button to push to keep the door from closing) I think they are ok.

In Automation when we have a system that can be open and close we simply have one button named "OPEN" and one button named "CLOSE", this is the best way to avoid the user to have to understand the icon or guess what it mean.

My Opinion on this problem: For easy to understand to all kind of people i prefer two options1) Use Open and Close text buttons instead of icon buttons2) Write text - 'open' and 'close' below of the icon atleast. it helps clarification of doubt.

Manufactures or who are design this board, i hope they are thinking about design look and feel or following their competitors ideas or taking inspirations from others to show to people attractive. In this case they might be forgetting about User Expereince- how many people understand their icons/ideas.

Adoption of the 2010 Standards also establishes a revised reference point for Title II entities that choose to make structural changes to existing facilities to meet their program accessibility requirements; and it establishes a similar reference for Title III entities undertaking readily achievable barrier removal.

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