An Obstacle Avoiding Vacuum Cleaner Robot (MAE 4733 Term Final Project Report)

7/27/2019 An Obstacle Avoiding Vacuum Cleaner Robot (MAE 4733 Term Final Project Report)

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An Obstacle Avoiding Vacuum Cleaner

Robot

COURSE NO. : ME-362

INSTRUMENTATION AND MEASUREMENT SESSIONAL

DEPARTMENT OF MECHANICAL ENGINEERING

BANGLADESH UNIVERSITY OF ENGENEERING AND TECHNOLOGY


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SUPERVISED BY:

DR. M. A. TAHER ALI

PROFESS0R, DEPT. OF MECHANICAL ENGINEERING, BUET.

DR. MD. ABDUR RASHID SARKAR

PROFESS0R, DEPT. OF MECHANICAL ENGINEERING, BUET.

DR. MUHAMMED MAHBUBUR RAZZAQUE

ASSOCIATE PROFESS0R, DEPT. OF MECHANICAL ENGINEERING, BUET.

A.K.M. MONJUR MORSHED

ASSISTANT PROFESSOR , DEPT. OF MECHANICAL ENGINEERING, BUET.

MD. AL-AMIN KHAN CHOWDHURI

LECTURER, DEPT. OF MECHANICAL ENGINEERING, BUET.

MD. WASIM AKRAM


ABDUL MOTIN



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ACCOMPLISHED BY

GROUP NO. B17

GROUP MEMBER

SHUVRA BANIK (Team Leader) #0510094

MD. JUBAYER HOSSAIN #0510077

MD. YEASIN BHUIYAN #0510085

MD. NURUZZAMAN BHUIAN #0510086


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ACKNOWLEDGEMENT

Starting with the name of Almighty we would like to pass our gratitude to him for completing

our project timely and successfully.

Beginning from the project proposal, the journey was never easy for us all the way through.

With the very little knowledge and experience, it was always going to be tough for us. Without

the help of few generous people, all our hard work would have gone into vain.

First of all, we would like to express our heartiest gratitude to our course teacher Dr. Md. Abdur

Rashid Sarkar sir. He was always there in our aid, as far as advices and suggestions are

concerned. We are also grateful to A.K.M. Monjur Morshed,Md. Al-amin Khan Chowdhuri, Md.Wasim Akram, Abdul Motin for helping us in different prospect of our project.

Assistant instrument engineer of Instrumentation and Measurement lab, Mr. Masudur Rahman

is one person whom we would never forget to mention. He was ever so cordial and good-

humored to serve us with whatever we needed. We are also thankful to the lab assistants of

the machine shop, welding shop and carpentry shop, who helped us in constructing the project.

Last but not the least, we should not also forget our friends and classmates who continuously

encouraged us and shared their ideas.


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CONTENTS

TOPIC PAGE NO.

INTRODUCTION 01

ABSTRACT 02

OBJECTIVES 03

BASIC COMPONENTS 04

MECHANICAL COMPONENTS 05-07

ELECTRICAL COMPONENTS 08-12

OTHER ELEMENTS 13

WORKING PRINCIPLES 14-19

APPLICATIONS &

COMMERCIALIZATION

20

LIMITATIONS 21

COST ANALYSIS 22

CONCLUSION 23

REFERENCES 24


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INTRODUCTION

As engineering practice goes mainly for autonomous control over expected operations, robotic

appliances have a vast field of applications. In other words, it is the heart of mechanical

engineering.

A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust

and dirt, usually from floors or carpets. Most homes with carpeted floors in developed

countries possess a vacuum cleaner for cleaning. These are the conventional human pushed

vacuum cleaner. But we thought in a different way. A robotic vacuum cleaner is the first step

towards our thoughts. A robotic vacuum cleaner is meant to supplement a standard, human-

pushed vacuum cleaner. It drives around the room autonomously to clean it. It will start

cleaning when the power button is switched on. Whenever there is any obstacle in front of the

cleaner it just changes its direction automatically and goes in the other way. It has also got the

ability of automatic shut down. The cleaning part of our project is based on Bernoulli's

Principle, which states that as the speed of air increases, the pressure decreases. Air will always

flow from a high-pressure area to a low-pressure area to balance out the pressure. The robotic

part is microcontroller based. The obvious outcome of the combination of these two parts is

the robotic vacuum cleaner and thats our ultimate objective.


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ABSTRACT

A vacuum cleaner is not a new concept in the field of mechanical engineering, but when itcomes about a robotic vacuum cleaner, its something new and different. Its not like the

conventional human pushed vacuum cleaner. It has got an autonomous control with the ability

of avoiding obstacle. The vacuum cleaner has an intake port where air enters and an exhaust

port where air exits. A centrifugal fan inside the cleaner, forces air towards the exhaust port at

a high speed, which lowers the pressure of the air inside according to Bernoulli's Principle. This

creates suction - the higher pressure air from outside the vacuum rushes in through the intake

port to replace the lower-pressure air. The incoming air particles rub against any loose dust or

debris from the floor or carpet and carry these in the exhaust port which is a glass box. There

are two holes in the box covered with nets. The dirt is trapped in the nets, but the air passes

right through the holes to the environment. A brush is placed at the intake port, which kick dust

and dirt loose from the carpet so it can be picked up by the air stream.


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OBJECTIVES

The main objectives of our project are:

To model a vacuum cleaner with robotic control.

To save time and power by automatic control.

To make the task of cleaning easier.

To come up with some new ideas concerning vacuum cleaning.


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BASIC COMPONENTS:

The basic elements, we used are of two types :

1. Mechanical Components2. Electrical Components

Fig: A conventional vacuum cleaner


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1. Mechanical Components :

SPECIALLY DESIGNED FAN :The fan is so designed that it can create pressure difference between

bottom and upper portion. It is a backward curved type centrifugal fan. It is rotated by a motor.

Fig: Specially designed fan


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WHEELS :Four wheels are used in this project .The front two wheels are given power & are

controlled by two motors .Two revolving wheels are also used for bearing loads placed on the

board.

Fig: Nylon wheel and revolving wheel

D.C. MOTOR :An electric motor is a machine which converts electrical energy into

mechanical energy. Its action is based on the principle that when a current-carrying conduction

is placed in a magnetic field, it experiences a mechanical force.

Fig: DC motor


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GEAR MOTOR :We used two gear motors to control the two front wheels individually.

Fig: Gear motor


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2. ELECTRICAL COMPONENTS :

* * CIRCUIT ELEMENTS **

RESISTORS :A device which is us used to resist current in an electrical circuit.

Resistors can be made from different material. But the most common is carbon composition

(Graphite plus binding agent).Basically it is small and thin section of carbon composition with

Lead at each end.

Resistance is measured in Ohms & is represented by the Greek symbol Omega. To abbreviate

a bit ,prefixes are generally used to indicate a multiplier or resistance value. Typically we see

just two of these :

K=thousand ; 1K =1,000

M=million ; 1M =1,000,000 =1000 K

Fig: Resistance

VARIABLE RESISTANCE :Variable resistance shows different values of resistance in

different position within a predefined range. In our circuit we used 100 k variable

resistance.


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L.E.D. ( Light Emitting Diode) :It is one kind of color bulb.It emits visible light when current

passes in forward direction.It also has polarity.Generally it can withstand 5 to 25 mA of

current.So , a fixed variable resistor is used in series for its safety.

Fig: LED

MOSFET :The metal oxide semiconductor field effect transistoris a device, used to

amplify or switch electronic signals. It is by far the most common field effect transistor

in both digital & analog circuits. It is composed of a channel of p-type & n-type

semiconductor material & is accordingly called a PMOSFET & an NMOSFET.

IRF840 is used to drive each dc motor connected with two front wheel.

33 A , 100V , 0.04 , N-Channel Power MOSFET

Ultra low On-Resistance

Fig: Mosfet


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MICRO-CONTROLLER:ATmega-8 microcontroller is used in our project. The feature are

given below :

Fig: Micro-controller

Fig: Pin configuration

IC (INTEGRATED CIRCUIT) 7805:Some types of chips are particularly sensitive to voltage fluctuations. The 7805 power

regulator will take any voltage between 6V and 12V DC and turn it into a smooth 5V to

power the chips. The easiest method of building the circuit is on and electric breadboard.

They are available at all electronics stores.


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IR (INFRA-RED) TRANSMITTER :It is used to send infra-red which will be reflected

somehow if there is an object in front of it.

IR (INFRA-RED) RECEIVER :It is used to receive the infra-red which has been reflected

towards it and it makes a corresponding voltage change.

Fig: IR transmitter & IR receiver

Project board :Project-board is used to connect all the circuit elements

Fig: Project board


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** OTHER ELECTRICAL ELEMENTS **

BATTERY :A 12V battery is used to supply the power required.

WIRES :

Wires are used to connect all the electrical components to make a complete circuit.


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WORKING PRINCIPLE :

Working principle of this cleaner robot can be divided as follows:

1)Mechanical Part

2)Circuit & Programming Part

1. Mechanical Part :

Basic Principle :

Vacuum cleaners work because of Bernoulli's Principle, which states that as the speed of air

increases, the pressure decreases. Air will always flow from a high-pressure area to a low-

pressure area, to try to balance out the pressure. A vacuum cleaner has an intake port where

air enters and an exhaust port where air exits. A fan inside the vacuum forces air toward the

exhaust port at a high speed, which lowers the pressure of the air inside, according to

Bernoulli's Principle. This creates suction - the higher pressure air from outside the vacuum

rushes in through the intake port to replace the lower-pressure air. The incoming air particles

rub against any loose dust or debris from the floor or carpet and carry these in the exhaust

filter bag made of porous woven material (typically cloth or paper). The dirt is trapped in the

filter bag, but the air passes right through the bag to the environment. Some vacuum designs

also have rotating brushes at the intake port, which kick dust and dirt loose from the carpet so

it can be picked up by the air stream

We use the specially designed fan to creating vacuum. The fan is

rotated by a DC motor. So dust is suck from bottom to upper portion & is stored at a particular

place inside the transparent glass box.

Two front wheels are controlled individually by two motor for movement

at various places. Rear wheels are used just to bear the loads (Battery, Transparent glass box

etc.) placed on the small vehicle. They are not given power.


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2.Circuit &Programming part :

CIRCUIT DIAGRAM :


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Programming Part:

The code is written in Programming language C in AVR Studio 4. PonyProg 2000 software is

used to download the program from computer to the micro-controller.

The code is given below :

#include

#include

double ADC_value;

int a,b;

int test=0;

ISR(ADC_vect) //Interrupt function

{

ADC_value = ADCL;

ADC_value += (ADCH


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for(b=0;b5) //Will stop robot after facing obstacles for 5 times

{

PORTD=0; //All output is stopped

while(1)

{}

}

test++;

}

ADCSRA |=(1


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ADMUX |=(1


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ADC_init(); //ADC is called

sei(); //Global interrupt begins

while(1)

{}

}

}

}

return 0;

}


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APPLICATIONS & COMMERCIALIZATION

Automatic house cleaning Suitable for office and industries Is possible for commercialization High scale production will reduce the per unit cost


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LIMITATIONS :

We are not out of limitations.

IR sensor does not work efficiently in the daylight. Heavy weight of the cleaner has decreased the speed. Insufficient power supply has decreased efficiency.


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COST ANALYSIS

As we did this kind of project for the first time, some money has been wasted where there was

no reason to spend that. Without this all money was spent efficiently. A list of all the things we

used in our project and their prices are given below:

SL NO. PURPOSE QUANTITY COST(Tk.)

1. Centrifugal fan 1 500

2. DC Motor 1 600

3. Gear Motor 2 900

4. Wheel 4 250

5. Base 1 100

6. Micro-controller 1 80

7. IR Transmitter 1 158. IR Receiver 1 15

9. Mosfet 3 90

10. IC -7805 2 20

11. LED 3 3

12. Battery 1 420

13. Project board 2 420

14. Net &Wire - 40

15. Switch 1 10

16. Transparent glass box 1 600

TOTAL 4063


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CONCLUSION

Nowadays every technical branch of applied science looks for commercial application. A roboticvacuum cleaner can be a good example of that. A wide application of this project can make our

daily life easier.

On finishing our ME-362 course, we can say that, it had been a great experience for all of us. It

was something new anything new has always some adventure and enthusiasm associated with

it. We felt the heat of it as well. At last we feel like mechanical engineers! Before this project,

we hardly had any experience of working together to accomplish a certain task by our own. We

were very lucky to be member of the same group and it was a joy to work aside friends. We

came to know how to gather necessary resources and assemble them to achieve the goal. This

was the first time we could blend our innovation and knowledge too. At the end of the project,

we feel proud and happy that we have stepped a foot forward towards our professional life.

Once again thanks to all the people, who have helped us in one way or another to make our

project successful.


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REFERENCES

From time to time we took help from different types of books and websites. The list ofreferences from which we really got some help is as follows:

1. http://www.societyofrobots.com/

2. http://home.howstuffworks.com/

3. http://www.wikipedia.org/

4. Mechanical Measurements

By-Thomas G. Beckwith

-Roy D. Marangoni

-John H. Lienhard V.

An Obstacle Avoiding Vacuum Cleaner Robot (MAE 4733 Term Final Project Report)

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