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Introduction

1. Introduction


It is difficult and to reach for buttons in a crowded lift while carrying bulky items. Being able to control the lifts without needing to press buttons is the key to increasing convenience.Our goal is to build a model of a lift with an automated lift control system that will increase convenience for users.


1.1 Problem being addressed



  In lifts we often use nowadays,we always have to press buttons to get us from one storey to the other.There are many times when we are carrying bulky items or the lift is too crowded and cannot reach for the lift buttons.It would be easier for us if we do not need to reach out and press the button.(Angwin, 2006) In this project,we aim to replace the buttons with another more convenient alternative such as a lift that can be controlled by mobile devices or a voice controlled lift.


     1.2 Engineering Goals


In particular, we want to


(a) build the lift shaft


(b) build the lift unit


(c) wire the motor

(d)program the motor using Arduino


1.3 Specific Requirements


The lift has to be:
  • Efficient-achieving maximum productivity with minimum wasted effort or expense
  • User-friendly-Easy to use or learn to use
  • Reliable-Consistently good in quality or performance


1.4 Alternative Solutions


1.4.1 Design 1


Our first idea was for the lift to respond to voice commands.(TalkandLift, 2009)The passenger inside the lift unit would simply have to tell the lift verbally of which floor he/she wanted to go to.


How exactly would the lift respond to voice commands?We would need to find a suitable software that is compatible to Arduino and allows it to control the lift through voice commands.Such software would be hard to find.
The disadvantages of this solution include
  • the software might not be able to pick up multiple voice commands
  • such software takes up a lot of storage space,which might prove to be a problem for the microcontroller


1.4.2  Design 2


Our second idea was for the lift to be controlled by infrared sensors.Infrared sensors would be placed within the lift unit.The passenger would simply have to place an object in front of  in front of the sensor with the number of the floor he wished to go to.


How exactly does a infrared sensor work? An infrared sensor is an electronic instrument which is used to sense certain characteristics of its surroundings by either emitting or detecting infrared radiation. Infrared sensors are also capable of measuring the heat being emitted by an object and detecting motion (Chilton, 2013).
By placing one’s hand over the infrared sensor,the sensor would detect heat being emitted by the hand.The sensor would send a signal to the microcontroller that controls the engine or motor,which in turn will bring the lift to the designated floor.


The disadvantages of this solution include
  • infrared sensors have to be placed far apart to prevent multiple inputs from objects placed in front of the sensors,thus there might not be enough space in the lift for many sensors


1.4.3  Design 3


The third idea would make use the passenger’s mobile phone to control the lift.The mobile phone would need to have an app called Annikken Andee.Annikken Andee is designed for the widely popular Arduino platform, the Annikken Andee allows you to easily monitor and control electrical devices and gadgets wirelessly via Bluetooth.(Annikken Andee,2014) It would connect to Annikken Andee,an Arduino shield via Bluetooth.The Arduino,in turn,will control the motor.


The disadvantages of this solution include
  • Users who do not have mobile phones with Bluetooth cannot operate the lift via Annikken Andee and will have to use the buttons manually,which would not solve the problem.


1.4.4 Best solution and reason


After much evaluation,we decided that design 3,the bluetooth operated lift,is the best solution.

The idea involving the use of the infrared sensors would have many disadvantages.If the building with this lift had many floors,there would be many infrared sensors along the wall of the lift unit,taking up a lot of space.The sensors would also have to be placed closer to each other as there might not be enough space in the lift unit for sensors of for each floor.This might result in multiple infrared sensors sensing the user's finger and the lift might take the user to other floors instead of his destination,which would decrease efficiency.If such problems happen often,the lift would not be reliable.

The idea involving the use of a voice controlled elevator would not be efficient as multiple users would have to tell the lift which floor he or she wanted to go to verbally.The voice controlled elevator system with might not be able to pick up two voice commands at the same time,thus the users would have to say which floor they wanted go to go one by one,which would be very time consuming,especially in a crowded elevator.

For the idea involving the use of bluetooth and the mobile application Annikken Andee,the user would simply need to use his/her mobile phone to tell the lift which floor he/she wanted to go to.This idea will increase convenience for users as they no longer need to press buttons and also increases efficiency in terms of time consumption,especially for users going to work.Unlike the other two ideas,problems with multiple users and lack of space for sensors are not present when this lift control system is used.Therefore,it is the best solution.

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stanley yeo 杨志艺

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