TABLE OF CONTENTS
Title
page - - - -
Certification
- - - -
Dedication
- - - -
Acknowledgement
- - - -
Abstract
- - - -
Table
of contents - - - -
CHAPTER ONE
Introduction
- - - -
Aims
and objective - - - -
Purpose
of the study - - - -
Scope
of the study - - - -
Limitation
of the study - - - -
Significance
of the project - - - -
CHAPTER TWO
Literature
review - - - -
History
of light – electric bulb - - - -
CHAPTER THREE
Construction
procedures - - - -
Materials
used in the project - - - -
Selection
of appropriate tools and equipment - -
Safety
precautions - - - -
Assembly
- - - -
CHAPTER FOUR
Sequence
of operation - - - -
Capacitor
- - - -
Resistor
- - - -
Transistors
- - - -
CHAPTER FIVE
Summary
- - - -
Recommendation
- - - -
Conclusion
- - - -
Reference
- - - -
CHAPTER ONE
1.1
INTRODUCTION
The light sensitive
alarm is an electronic circuit that detects a sudden shadow falling on the
light sensor and sounds the bleeper. When this happens, the circuit will
respond to gradual charges in brightness to avoid false alarm. The beeper
sounds for only a short time to prevent the battery from running flat. Normal
light can be use. The circuit will work best if a beam of light is made to fall
on the light sensor. Breaking this beam will then cause the bleeper to sound. The
light sensor is a light dependent resistor (LDR); this has a low resistance in
bright light and a high resistance in dim light. The light sensitivity of the
circuit can be adjusted by varying the 100kiloohms (K) preset. The length of
bleep can be varied from 0.5 to 10 seconds using 1 milliohm (M) preset. using
the 7555 low power timer ensures that the circuit draws very little current of
about 0.5 milli-Amps except for the short time when the bleeper is sounding,
this uses 7 milli-Amps. If the circuit is switch on continuously, an alkaline
9V battery should last for about a month.
1.2
AIMS AND OBJECTIVES
The project is actually
designed to promote high level of security in workshops, industries and home.
It enhances a recorded indication of visitors and to summon staff or personnel
to fulfill a service as in domestic and industrial use.
1.3
PURPOSE OF THE STUDY
The purpose of this
study is to provide maximum security round the world.
1.4
SCOPE OF THE STUDY
This project “light
sensitive alarm” is design mainly to alert the user by a bleeper when the
circuit detects a sudden shadow falling on the light sensor the bleeper
duration can be controlled by varying the I ohms – preset resistor.
1.5
LIMITATION OF THE STUDY
The limitations of this
study are: the bleeper sound for only a short time to prevent the battery from
running flat. If there is any little mistake during soldering, there will not
work well. Also by met being able to purchase some components and their exact
value couple with transportation problems has also gone a long way to reduce
the efficiency of this project.
1.6
SIGNIFICANCE OF THE PROJECT
This project helps to provide security
in offices, hotels, homes etc. it also promotes and encourage researches
involving in security research projects.