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CONSTRUCTION
OF CAR TOUCH INTRUDER ALARM
ABSTRACT
The main objective of
this project was to ensure a proper security to car being parked in garage
against theft or an intruder. The circuit uses three
NE555 timers; one of the NE555 was wired as a monostable oscillator and
remaining two were wired as tone generator and amplified to obtain a maximum
audible sound. However, pin 2 of the first NE555 was used as sensor part .When
pin 2 has contact with human body or hand it will activate the IC1 which will
also bias transistor and this transistor was wired in a way that once it is
powered it will close circuit thereby passing a negative supply voltage
to tone generator circuit and outputted out through a loud speaker or buzzer.
This device functions
as a major security device against car-theft as stated above. It is an
electronic device that is connected to the battery of the car it is being
installed in and gets activated when the car engine is switched off and the car
stationed at a place. The device is not seen but, it has an indicator light
which shows that the alarm has been activated. When the body of the car is
touched by human hand, it sends a negative signal to the device which needs a
negative pulse to get activated; it sends this negative from the human hand to
the tone generator IC which triggers the alarm.
TABLE OF CONTENT
CHAPTER
ONE: Introduction
1.1
Background of study
1.2
Aims and objectives
CHAPTER TWO: Literature Review
CHAPTER THREE: Specification and operation of system
component
3.1 Description of NE55 Timer
3.2
Description of Resistor
3.3
Description of Capacitor
3.4
Description of Diode
3.5
Description of Transformer
3.6
Description of Loud Speaker and Buzzer
3.7
Description of Transistor
3.
8 Description of L.E.D
CHAPTER FOUR: Operation of system and its circuit and block diagram
4.1
Operation of
4.2
The circuit diagram
4.3
The block diagram
CHAPTER FIVE: Construction, Testing and Packaging
5.1
Values of components
5.2
Assembly
5.3
A schematic diagram of the finished work
CHAPTER SIX: Conclusion and Recommendation
6.1
Conclusion
6.2
Recommendation
6.3
Observations
6.4
Dificulties
6.5
Reference
LIST OF SYMBOLS
NAME
SYMBOLS
Resistor
|
Transistor
Diode
Zener
diode
Trimmer
capacitor
Polarized
capacitor
Unpolarized capacitor
|
|
Variable capacitor
CHAPTER
ONE: INTRODUCTION
1.1.
Background of the
Study
The first car alarm was a
primitive contraption that utilized a bell or horn connected to the drive
shaft. It was created by an unnamed Nebraska inventor in June 20th,
1920. It utilizes the drive shaft to operate its own bell or horn signal when
the car is properly moved. This is just a little talk on a car alarm but not a
car touch intruder alarm which is a modern, more advanced, and more reliable
type of car alarm.
This car touch sensitive alarm project consist of three NE555 timer IC, the
first NE555 was wired as monostable multi-vibrator and the remaining two
were wired as tone generator. When the sensor is
touch or has contact with human hand perhaps body, IC1 is triggered at its pin
2 and output pin 3 goes high for a time period previously set by the values of
R4 (10M) and Q1 (transistor) was bias via R3 and this transistor is in such a
way that once it was biased it will supply a negative voltage to tone generator
thereby making two NE555 timer which was know as (tone generator) to oscillate
to make a bell sound through the buzzer. The tone generators are configured as
an astable multi-vibrator whose oscillation frequency can be varied with the
help of PR1 and PR2. By adjusting the values of PR1 and PR2, modifications on
the tone are possible.
The reset
button is used to set or open circuit the system back to its initial stage. The
system is powered with 12V power supply voltage.
The first chapter of this project is narrating on the
introduction, the concept of the system and also the aims and objective.
Chapter two is all about literature review. Chapter three talks about specification
and operation of system component. Chapter four is operation of system. Chapter
five is about construction, testing and packaging. Chapter six is conclusion,
observation, recommendation and References.
1.2
AIM AND OBJECTIVE
The main aim and objective of the design and construction this project is to
create a comfort in the minds of vehicle owners or users when their vehicles
are parked or stationed anywhere without much fear of car-theft.
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