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Project Report
On
SECURED WIRELESS DATA COMMUNICATION
SUBMITTED
IN PARTIAL FULLFILLMENT
FOR THE AWARD OF DEGREE OF
BACHELOR OF TECHONOLOGY
IN DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
SUBMITTED TO: SUBMITTED BY:
DEPARTMENT OF SHEENA JAIN (7EC-99)
ELECTRONICS & COMMUNICATION ENROLMENT No:JNUjpr/0102080123
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
JAIPUR NATIONAL UNIVERSITY, JAIPUR
APRIL 2012
Security system Switcher 1
PREFACE
This file includes the information about the project that I have made under the guidance fo
faculty of Electronics and communication Dept. The name of the project is secured wireless
data communicatin. The duration of the project is around 60 days. This file includes all the
topic related to the project like circuit diagram, explanation of circuit, steps of fabrication
etc. I wish to express my gratitude towards my mentor Mr. Mukesh Maheshwari and Mr.
Subhashish Tiwari of Electronics and Communication Dept. for their affectionate and
undaunted guidance and support.
.
Security system Switcher 2
ACKNOWLEDGEMENT
I gratefully acknowledge to my mentor…………………, Lecturer of Electronics &
Communication Engineering, JNU, Jaipur, for his valuable guidance, excellent supervision &
constant encouragement during my project work at Jaipur National University, Jaipur, for
continuous interest to pursue my project work.
I am greatly indebted to his deep perception, understanding ability, mature, excellent
supervision and generous help which he rendered to my every step. Without his cooperation
and guidance, it would have been inconceivable to complete my undertaken project. I am also
thankful to all the faculty members of Electronics & Communication department without
which i was not able to complete my project.
Sheena Jain(8EC-98)
Security system Switcher 3
ABSTRACT
SECURED WIRELESS DATA COMMUNICATION (AT89S52)
This project is used to communicate or transmit a text message from one place to another place through
wireless. The text message is encrypted by using the Microcontroller and the encrypted message was
transmitted through wireless. At the receiver end the signal was received by the standard receiver and the
analog signal was fed to the Microcontroller and it was decrypted by the Microcontroller and the
message was displayed over the LCD display. We can use several receivers and the message from the
transmitter can be sent to the entire receivers at the same time. Each receiver can be accessed separately
by its address.The Microcontroller is used to do the above work. It gets data from the Keyboard and
encrypt with an private algorithm and at the receiver end the Microcontroller decrypt it with the same
algorithm and display the data over the LCD display.
Security system Switcher 4
TABLE OF CONTENTS
1) Circuit diagram
2) Explanation
3) PCB layout
4) Fabrication and Assembly
5) Result
6) Datasheets
7) Component list and cost
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TABLE OF DIAGRAM
1) Circuit diagram
2) PCB layout
3) Screen of express PCB software
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CIRCUIT DIAGRAM
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CIRCUIT DIAGRAM
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CIRCUIT DESCRIPTION
WORKING
PCB LAYOUT
FIG: PCB LAYOUT OF secured wireless data communication
FABRICATION AND ASSEMBLY
There are many steps include in the process of fabrication. The steps are as follows:
a) MAKING OF PCB LAYOUT
Firstly I made the PCB layout of my circuit. PCB layout can be made by using the
following softwares:
i) Express PCB
ii) Eagle
I made my layout by using Express PCB software. I have chosen this software
because it is very easy to use. It consist of a component library in which I found
almost every component. It has a very wide library of components. Below is the
screen of the Express PCB software.
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FIG: SCREEN OF EXPRESS PCB SOFTWARE
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We can make layout of any circuit in this software. We can make the layout of any
circuit by simply connecting the wires. In this software the components are connected
with the help of trace path. But there is a limitation of this software that the two trace
path cannot intersect each other. If this happens then the trace paths are shorted. The
trace path cannot be turned by 90 degree. The trace path should be turned at 45
degree angle. In this way we can easily make the layout of any circuit by using this
software.
b) CLEANING OF PCB
In this process we have to clean the PCB through the metallic wool. Cleaning of PCB
means removal of grease from the surface of PCB. We have to use copper clad PCB
i.e. plain PCB. In order to clean the PCB, the copper clad is tightly rubbed by the
metallic wool. One thing is very important that the PCB should not be hold from its
surface. We should hold it from its edges.
c) TRANSFER OF LAYOUT ON PCB
After making the layout of the circuit the layout is to be transferred on the PCB. Take
the lase printout of the layout on the epoxy sheets. These are the following methods
for transferring the layout on the PCB:
i) Laser printing
ii) Press and peel method
I have used the press and peel method. It is a very easy method. As the PCB is now
cleaned so the layout is ready to be transferred on PCB. Put the PCB on a hard
surface. Put the layout on the bottom surface of PCB. Now apply pressure on it by
Security system Switcher 11
using an iron. The heat released by the iron on the paper will help to transfer the
layout on the PCB. In this way the whole layout is transferred on the PCB.
d) COOLING OF PCB
After transferring the layout on the PCB the next process is cooling of PCB. As we
have used an iron so PCB become hot. So put the PCB in the water for some time to
decrease its temperature. Now remove the paper from the surface of PCB so that only
layout is imprint on the PCB. Paper is removed by using a toothbrush.
e) ETCHING
Etching is the process of removal of copper from the PCB surface. This is done by
putting the PCB in the solution of water and anhydrous ferric chloride. Put the PCB
inside the solution and stir continuously until all the copper is removed from the
surface of the PCB.
f) REMOVAL OF TONER FROM THE PCB SURFACE
After etching we have to clean the PCB with the acetone in order to remove the toner
of the laser printout from the PCB surface. This is done by making the cotton to dip
inside the acetone and then this cotton is rubbed against the PCB. In this way the
toner is removed and the colour of the trace path become golden.
g) DRILLING
After the removal of toner from the PCB surface we have to drill the PCB in order to
make the holes on the appropriate place according to the layout. This is done by using
the drill bit. Now the PCB is fabricated.
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h) ASSEMBLY
Now after the fabrication the components are to be assembled on the PCB according
to the circuit layout.
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RESULT
`
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COMPONENT LIST AND COST
NAME OF COMPONENT QUANTITY COST
Resistor (10k, 100k) 4 2/-
Resistor (1M, 3.3k, 4k, 1k) 1 1/-
Ceramic Capacitor (0.01uf, 0.1uf) 2 1/-
Electrolytic capacitor (1000uf, 220uf) 1 7/-
Electrolytic capacitor (47uf, 2.2uf) 1 4/-
Preset (2.2M) 2 8/-
IC LMC555 1 12/-
IC CD4538 1 20/-
IC 7805 1 8/-
SPDT switch 1 8/-
Condenser microphone 1 5/-
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Diode (1N4007) 6 12/-
Diode (1N4148) 2 4/-
Transistor (BC547) 1 4/-
Led 1 1/-
Piezoelectric buzzer 1 10/-
Copper clad 2 30/-
Metallic wool 100gm 50/-
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