1. MICROCONTROLLER BASED INTELLIGENT
SECURITY SYSTEM USING WIRELESS
SENSOR NETWORKS AND GSM
Under the guidance of
Mr. R. Mynuddin Sulthani , M.Tech.,
BY
B.Neeharika 10751A0409
K.B.Roja 10751A0449
G.Sreepriya 10751A0435
K.Bhanu Prakash 10751A0450
B. Sujan Kumar 10751A0412

2. CONTENTS
Overview of project
Block diagram
Hardware and software requirements
Introduction to embedded systems
AT89S52 microcontroller
Interfacing of components
Advantages
Applications
Conclusion 2

3. What is the purpose of this project?
 To ensure the security of the home at low
cost.
 To develop an embedded security system
which detects others not to intrude the homes
or offices etc.

4. WORKING OF THE PROJECT
The security system uses GSM interface to
communicate with the authorized person.
The project works on embedded designed
board with three sensors
 IR sensor
 Temperature sensor
 Light Dependent Resistor

5. HARDWARE REQUIREMENTS
Microcontroller
Power Supply
IR Sensor
GSM modem
Buzzer
LCD
PIR sensor
LDR sensor
SOFTWARE REQUIREMENTS
Keil software
Embedded C

6. INTRODUCTION TO EMBEDDED SYSTEMS
An embedded system is a computing device
that does a specific focused job.

7. BLOCK DIAGRAM

8. HARDWARE REQUIREMENTS

9. FLOWCHART

10. AT89S52 MICROCONTOLLER

11. FEATURES OF AT89S52
 Compatible with MCS-51® Products
 8K Bytes of flash memory
 4.0V to 5.5V Operating Range
 256 x 8-bit Internal RAM
 32 Programmable I/O Lines
 Three 16-bit Timer/Counters
 Eight Interrupt Sources

12. PIN CONFIGURATIONS

13. 8052 MICROCONTROLLER MEMORY
ORGANISATION
Program Memory (ROM) is used for
permanent saving program being executed.
Data Memory (RAM) is used for temporarily
storing and keeping intermediate results and
variables.
All 8052 microcontrollers have 16-bit
addressing bus and can address 64 kb
memory.

14. INTERNAL STRUCTURE OF
MICROCONTROLLER

15. INTERFACING OF COMPONENTS

16.  Consists of two lines with 16 characters
each.
 Contrast on display depends on the power
supply voltage and whether messages are
displayed in one or two lines.
 During operating, a resistor for current
limitation should be used.
LCD SCREEN

18. MAX232
It is used to match the voltage
levels of TTL, CMOS.
Only then, transmission and
reception between GSM takes
place.
The capacitor used in MAX232
charges and discharges
according to the voltage levels
to get matched. 18

19. GSM
It is an open, digital cellular technology used
for transmitting mobile voice and data
services.
Operates in 900MHz and 1.8GHz bands
Supports data transfer speeds of up to 9.6
kbps, allowing the transmission of basic data
services such as SMS.
19

20. LIGHT DEPENDENT RESISTOR
 LDR is made up of
Cadmium Sulphide.
 When light falls on it, the
value of resistance reduces
and current will be generated
as light is inversely
proportional to resistance.

22. TEMPERATURE SENSOR

23. It is made up of pure silicon (as sensing
capacity is more for silicon).
It consists of three terminals: supply , output,
ground.
The output of this sensor is connected to
microcontroller.

24. IR SENSOR
 IR sensor consists of a potentiometer and
comparator along with transmitting and receiving
LED’s.
 Transmitting LED works with 5v, receiving LED
works with 3.5v.
 If any object is placed in between, the IR rays from
transmitting LED will get reflected and receiver
LED absorbs it.

25. LM358(Comparator) compares the obtained
value with threshold value and produces
output.
IR sensors are used in shopping malls,
automatic door opens etc.
We use near IR (0.7um-1.4um) in this
project.

26. SOFTWARE REQUIREMENTS

27. KEIL SOFTWARE
 Keil compiler is a software used where the
machine language code is written and compiled.
 After compilation, the machine source code is
converted into hex code which is to be dumped into
the microcontroller for further processing. Keil
compiler also supports C language code.

28. PROLOAD
 A software which accepts only hex files.
 Once the machine code is converted into
hex code, that hex code has to be
dumped into the microcontroller placed in
the programmer kit and this is done by
the Proload.

29. ADVANTAGES
To ensure the security of the home at low
cost
The authorized person can also alert with
that message.

30. FUTURE SCOPE
• The cameras used for security surveillance are not
appropriate for home privacy protection
• The cost of complete system is high
• Low cost systems should be developed to monitor
people at home
• The time to detect any abnormal incident should be
detected as fast as possible and the message to
the authorized person should be quickly reached

31. CONCLUSION
 Plays an important role in surveillance of
home.
 The designed system is used to automate
the security systems to ensure the security
of the home at low cost and the authorized
person can also be alerted with a message.