design of water level activated alarm system for house water tank - tj213 .m42 2009

7/23/2019 Design of Water Level Activated Alarm System for House Water Tank - TJ213 .M42 2009

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DESIGN OF WATER LEVEL ACTIVATED ALARM SYSTEM FOR

HOUSE WATER TANK

MOHD HAFIENI BIN MD YAKIM

MAY 2009


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DESIGN OF WATER ACTIVATED ALARM SYSTEM FOR HOUSE

WATER TANK

MOHD HAFIENI BIN MD YAKIM

This Report Is Submitted In Partial Fulfillment of Requirements for the Degree of

Bachelor in Electrical Engineering

(Industrial Power)

Fakulti Kejuruteraan Elektrik

Universiti Teknikal Malaysia (UTeM)

May 2009


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I hereby declared that this report is a result of my own work except for the excepts that

have been c ited clearly in the references

Signature :

Name : Mohd Hafieni bin Md Yakim

Matrix Number : B010510128

Date : 13 / 05 / 2009


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Saya akui laporan ini adalah has il kerja saya sendiri kecuali ringkasan dan petikan yang

tiap-tiap satunya saya jelaskan sumbernya.

Tandatangan :

Nama : Mohd Hafieni bin Md Yakim

No. Matrik : B010510128

Tarikh : 13 / 05 / 2009


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I hereby declared that I have read through this report and found that it has comply the

partial fulfillment for awarding the degree of Bachelor of Electrical Engineering

(Industrial Power)

Signature : .

Supervisors Name : P. M. Dr. Musse Mohamud Ahmed

Date :


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Saya akui bahawa saya telah membaca karya ini pada pandangan saya karya ini

adalah memadai dari skop dan kualiti untuk tujuan penanugerahan Ijazah Sarjana Muda

Kejuruteraan Elektrik (Kuasa Industri).

Tandatangn : .

Nama Penyelia : P. M. Dr. Musse Mohamud Ahmed

Tarikh :


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For my beloved father and mother

Md Yakim Bin Lambak and Halimah Binti Abdullah

For all their support and understanding.


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ACKNOWLEDGEMENTS

In the name of Allah, The Beneficent, The Merciful.

Alhamdulillah, all praise is to Allah that I have been able to complete my report for

my Projek Sarjana Muda 2 that is design of water level activated alarm system for house

water tank.

Successfully completion of this project would not have been possible without the

tremendous amount of time, assistance, and understanding of the people in my university

life and my personal life. I would like to acknowledge my Honors supervisor, Associate

Professor Dr. Musse Mohamud Ahmed, whose guidance and expertise was essential to the

project. A very big thank you must also goes to my family, especially my parents, for theinfinite ways in which they have supported my studies all this year. A special thank you

must goes to my sister and my brother for all their proofreading and to all my friends and

fellow BEKP class mates, for their support, humors and knowledge that kept me going

through the year. Finally, many thanks are also due to the FKE technicians and also all

lecturers who helped and gave their brilliant ideas and the use of the equipments in the

libratory of FKE.


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ABSTRACT

This project is inspired to monitor and detect water level when the water filled up in

house water tank. When water is filled up with the house water tank, water level must be

determined. So, this project is required to design and implement a circuit that detects water

level and shows by numbers of the LED and the alarm will function when the water is filled

up with the house water tank. The project circuit is also included the specific conductivity

mechanism that would show the levels of different numbers of LED when the water is filled

up with the house water tank. The specific conductivity varies with temperature, volume and

separation distance of the measurement probes. Normally, water tap has a conductance of

about 50 uS /cm and 20K Ohm / cm at 25 C. The circuit is drawn out as a block diagram,

and then entered in a schematic using MULTISIM to simulate for correct functionality.

Once the circuit is performed accurately in testing it will be assembled with the actual

components on a breadboard and will be verified using laboratory equipment.


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ABSTRAK

Projek ini diinspirasikan untuk mengawal dan mengesan paras air apabila air diisi ke

dalam tangki air rumah. Apabila air sedang diisi ke dalam tangki air rumah,kandungan air

didalam tangki tidak dapat dilihat tidak dapat mengenal pasti paras air tersebut.Jadi,projek

ini perlu merekabentuk dan memasang litar yang boleh mengesan paras air dan paras air

tersebut boleh ditunjukkan berdasarkan bilangan LED yang menyala seterusnya alat

penngera akan berbunyi apabila sampai ke paras air yang dikehendaki.Litar project ini

menggunakan mekanisme `specific conductivity` yang akan mengesan paras air yang

berbezaapabila air memenuhi tangki air rumah. `Specific conductivity` beebeza dengan

suhu,isipadu dan jarak pembahagian antara alat pengukur.Kebiasaanya, air mempunyai

pengalir iaitu 50 uS /cm dan 20K Ohm / cm pada 25 C.Litar ini dilukis menggunakan

MULTISIM untuk disimulasi untuk mendapat fungsi yang betul.Kemudian,semua

komponen yang sebenar digabung dan disusun pada papan litar dan diujikaji menggunakan

peralatan makmal.


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CONTENTS

CHAPTER TITLE PAGE

TITLE i

ACKNOWLEDGEMENTS v

ABSTRACT vi

ABSTRAK vii

CONTENTS viii

LIST OF FIGURES xii

LIST OF TABLES xiv

LIST OF ABBREVIATIONS xv

LIST OF APPENDICES xvi

1

INTRODUCTION1.1 Project Background 1

1.2 Problem Statement 2

1.3 Project Objective 2

1.4 Project Scope 2

1.5 Thesis Outline 3

2 LITERATUTE REVIEW

2.1 Introduction 4

2.2 Water level indicator 5

2.3 Water level indicator with alarm 6


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2.4 Differential water level activated alarm, water

indicator with alarm and water level indicator 8

2.5 Summary of commonly used water level technologies 9

3 METHODOLOGY

3.1

Introduction 10

3.2 Project planning 11

3.3 Flow chart 12

4 THEORY ON THIS PROJECT

4.1 Specific conductivity theory 16

4.1.1 Definition of conductivity 16

4.1.2 Specific Conductivity 17

4.1.3 Measurement of Specific Conductivity 18

4.2 AC supply theory 18

4.2.1 Introduction to AC supply 18

4.3 Voltage divider theory 21

4.3.1 Definition of voltage divider theory 214.3.2 Measurement of voltage divider 22

4.3.3 Resistive divider 23

4.3.4 Measurement of resistive divider 23

4.3.5 Low pass RC filter 24

4.4 Gate logic 25

4.4.1 The truth table 26

4.4.2 Operation of NAND Gate 26

4.4.3 Operation of Non-Inverter gate 27

4.4.4 Voltage buffer 27

4.4.5 Current buffer 27

4.5 Conclusion 28


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5 HARDWARE DEVELOPMENT AND DESIGN

5.1 Regulator supply 29

5.1.1 Voltage regulator introduction 29

5.1.2 The Transformer 31

5.1.2.1 Calculating secondary voltage 32

5.1.2.2 Calculating secondary current 32

5.1.2.3 Transformer rating in this project 33

5.1.3 The rectifier 34

5.1.3.1 Definition and basic circuit operation 34

5.1.3.2 The full wave rectifier 34

5.1.3.3 Calculating load voltage and currents 35

5.1.4 The Capacitor 36

5.1.4.1 Basic theory for capacitor as a filter 37

5.1.4.2 Capacitor function in this voltage regulator 39

5.1.5 Regulator LM7805 (5 V voltage regulator) 39

5.1.6 Summary of function of the voltage regulator

circuit 40

5.2 The activated level and alarm circuit 41

5.2.1 IC CMOS 4050b 415.2.2 IC CMOS 4011b 42

5.2.3 Energy stored in a capacitor 43

5.2.4 The operation of the activated level 44

5.2.5 The Operation of the Activated Alarm Circuit 46

5.2.6 Combination of the Activated Level and Alarm

Circuit 47

5.2.7 The prototype of the water tank 49

5.3 Water Level Activated Alarm System Circuit 50


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6 EXPERIMENTAL RESULTS AND DISCUSSION

6.1 Results 52

6.2 Experimental results 52

6.2.1 The water level indicator 53

6.3 Discussion 58

7 CONCLUSION AND RECOMMENDATION

7.1 Conclusion 59

7.2 Recommendation 60

REFERENCES 61


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LIST OF FIGURES

NO TITLE PAGE

Figure 2.1 Water level indicator circuit diagram 5

Figure 2.2 Water level indicator with alarm circuit diagram 7

Figure 3.1 Project planning schedule 11

Figure 3.2 Project methodology flow chart 13

Figure 4.1 A potential is applied across the plates 16

Figure 4.2 The relationship between conductivity and ion

concentrat ion for two common solutions 17 Figure

4.3 The sine wave in AC supply 19

Figure 4.4 Diagram of the move in AC supply 21

Figure 4.5 Simple resistive voltage divider 23

Figure 4.6 Resistor/capacitor voltage divider 24

Figure 4.7 The operation of NAND gate 26

Figure 5.1 The block diagram of the voltage regulator 30

Figure 5.2 Voltage regulator circuit(simulation) 30Figure 5.3 The basic of transformer 31

Figure 5.4 The flux flowing 31

Figure 5.5 The center tap transformer 33

Figure 5.6 The bridge rectifier (use in this project) 35

Figure 5.7 The two diodes rectifier 35

Figure 5.8 Illustrates the average 36

Figure 5.9 The capacitor theory 37

Figure 5.10 Capacitor in open circuit 38

Figure 5.11 5V voltage regulator schematic diagram 39

Figure 5.12 The regulator circuit hardware 40

Figure 5.13 a-The functional block diagram

b- Pinout 41


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Figure 5.14 a- 4011b pin placements

b- Symbol and the truth table for NAND gate 43

Figure 5.15 The simulation of the activated level circuit for one

level only 45

Figure 5.16 The activated level circuit 45

Figure 5.17 The activated alarm circuit 46

Figure 5.18 The simulation of the activated alarm circuit 47

Figure 5.19 The simulation of the combined activated level circuit

and alarm circuit 48

Figure 5.20 Combination of the activated level and alarm circuit 48

Figure 5.21 Prototype of the water tank 49

Figure 5.22 The simulation of the full circuit 50

Figure 5.23 The picture after combination circuit 51


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LIST OF TABLES

NO TITLE PAGE

Table 2.1 Differential water level activates alarm, water indicator

with alarm and water level indicator 8

Table 4.1 Summary of commonly used water level technologies 9

Table 6.1 The water indicator data 54

Table 6.2 The alarm operated data 57


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LIST OF ABBREVIATIONS

AC Alternating Current

DC Direct Current

LED Light Emitter Diode


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LIST OF APPENDIX

NO TITLE PAGE

APPENDIX Datasheet 62


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CHAPTER 1

INTRODUCTION

1.1 Project overview

This project is used the specific conductivity which varies with temperature, volume

and separation distance of the measurement probes. Water tap has a conductance of about 50

uS / cm measured at 25 Co. This project circuit triggers with any fluid with a resistance

between the maximum separation distances of the probes. The circuit has 4050B CMOS hex

buffer. All gates are biased off by the resistors connected between the ground and the buffer

input. The "common" probe is the topmost probe above probe 1 in the diagram is connectedto the positive 5 volt supply. If probe 1 is spaced 1 cm away from the common probe and

water tap at 25 Cois detected between the probes (a resistance of 20k) then the top gate is

activated and the LED 1 will light. Similarly if probe 2 at 2 cm distance from the common

probe detects water, LED 2 will light and so on. Switch 1 is used to select which output

from the hex buffer will trigger the alarm made from the gates of a CMOS 4011B IC.


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1.2 Objectives of the project

1. To design the water alarm system with indicator

2. To explore the specific conductivity as level technologies.

3. To use waters ability to conduct electricity

4. To build the house water tanks for home appliances.

5.

To design the switching circuit that with the desired water level to trigger the alarm.

6. To monitor the level of water in a bath or cold storage tank.

1.3 Problem statement

Nowadays, the house water tank is very important to keep water for daily use and in

emergency cases like when the main pipe leaks. So, water level indicator is important to

monitor the level of water in a bath or cold storage tank and to determine volume of

balanced water in the tank. This project is to create water activated alarm system that use

240 Vac 50 Hz and with specific conductivity as the level technology. The water activated

alarm system also can be used to monitor the level of another liquid in cold storage tank

where temperature of the liquid is 25 Co .So,the water level activated alarm system not only

used for water but its can be use for another liquid.

1.4 Scope of the project

1. To study the specific conductivity method

2. To design the circuit and combine it to create water activated alarm system uisng the

specific conductivity method.

a. Regulator circuit

b.

Water level control circuit

c. Synchronyse the project circuit with the tank

3. To do analysis and experiment on the circuit and prepare a full report


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1.5 Thesis Outline

Chapter 1 briefly summarizes the project background and problems statements as

well as it elaborates the objective and scope of the project.

Chapter 2 explains about the literature review. In this chapter it contains information

about the water level detector. Beside that it has some information about the components

that used for this project

. Chapter 3 explains about the project methodology. In this chapter it contains the

progress of the project. The project methodology which is the most important part that

describes the flow of the project is also discussed in detail in this chapter.

Chapter 4 discusses about the theory that is to be used in this project. Theory in this

project involved about the specific conductivity, the filter, the voltage regulator, the gate

logic and another related theory.

Chapter 5 explains about the hardware developments. In this chapter, the hardwarecomponents which are use in this project are explained in detail. Some results from

simulation using MULTISIM 10 has been shown.

Chapter 6 shows the testing results after testing for the project circuit. Some results

and analysis have been recorded in this chapter.

Finally, in Chapter 7 the conclusion of the project is discussed and necessary

recommendations are stated clearly.


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CHAPTER 2

LITERATURE REVIEW

2.1 Introduction

This chapter will discuss the literature review according to the Water Level

Activated Alarm system that is used in the residential and industrial areas. Summary of

Commonly Used Water Level Technologies also discussed in this chapter based on their

descriptions, advantages and disadvantages. Water Level technologies are very important to

discuss when designing the water level activated alarm which depends on the type of liquid,

size of the tank and the tank. This chapter as show the operation and the circuit diagram in

the residential and industrial areas. This is important to compare the Water Level Activated

Alarm system advantages and disadvantages.


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2.2 Water Leve l Indicator

Figure 2.1:Water level indicator circuit diagram

This circuit not only indicates the amount of water present in the overhead tank but

also gives an alarm when the tank is full. The circuit uses the widely available CD4066,

bilateral switch CMOS IC to indicate the water level through LEDs.When the water is

empty the wires in the tank are open circuited and the 180K resistors pulls the switch low

hence opening the switch and LEDs are OFF. As the water starts filling up, first the wire in

the tank connected to S1 and the positive supply are shorted by water. This closes the switch

S1 and turns the LED1 ON. Similarly the LED 1, the LED 2, LED 3 and LED 4 light

gradually when the water continues to fill the tank. The number of levels of indication can

be increased to 8 if 2 CD4066 ICs are used in a similar fashion. When the water is full, the

base of the transistor BC148 is pulled high by the water and this saturates the transistor,

turning the buzzer ON. The SPST switch has to be opened to turn the buzzer OFF. [12]

design of water level activated alarm system for house water tank - tj213 .m42 2009

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