Construction Of Light Sensitive Alarm System

Project and Seminar Material For Electrical Electronics Engineering EEE

Construction Of Light Sensitive Alarm System


This write up is concerned with the construction of a light sensitive alarm. The light sensitive alarm is an electronic device that detects a sudden shadow falling on the light sensor and sounds the bleeper when. The light sensitive alarm helps to produce a kind of sounds used in industries, hospital ambulance, and police car and so on. The circuit is built around q 7555 low-timer IC (Integrated Circuit) to generate the required alarm signal. The current from the light sensitive materials switches on a transistor amplifier.

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.

Chapter Five

5.1 Summary

Worldwide, it is evidently seen that the developed countries are still in rush of modern hi-tech security devices. This is to monitor opposition intelligence from introducing into their own intelligence.

The light sensitive alarm project is one of these new hi-tech security devices. It is portable in size, consumes insignificant power, less expensive to buy or construct and very reliable to the user (s).

One of the best aspect if it is that, apart from protecting it user(s) by sounding an alarm, it also protect security devices that secure human lives.

5.2 Recommendations

as an up coming engineer and scientist, after I hard painstakingly done enough work on this project, I see it fit and recommend it use not only in organizations and offices but also for personnel use. Specific area of its usages are doors, windows etc. mainly places under key and lock.

5.3 Conclusions

This device (light sensitive alarm) was incented to add to solve the world alarming security problems. It has been tested, patented, and found to meet the required specifications.

These three words “light sensitive alarm” gives a measurable security relief and also advances research in technology. This device was not invented to replace the duties of security men but to assist them.

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