Automatic Exit Indicator for Use in Darkness

8/8/2019 Automatic Exit Indicator for Use in Darkness

1/12

SCHOOL OF INFORMATICS AND ENGINEERINGDEPT. OF APPLIED ELECTRONICS & SYSTERM ENGINEERING

PROJECT PROPOSAL PRESENTATION

NAME : NICHOLAS OWUSU-DEBRAH

STUDENT ID : 0900108

PROGRAME :BEng. APPLIED ELECTRONICS & SYSTEM ENGINEERINGPROJECT TITLE : THE DESIGN & CONSTRUCTION OF AN AUTOMATIC

EXIT INDICATOR WITH AN ALARM FOR USE IN DARKNESS.

LEVEL : 400

DATE : 7TH NOVEMBER, 2009.


2/12

CONTENTS

1. INTRODUCTION

2. PROBLEM STATEMENT

3. OBJECTIVES OF THE PROJECT

4. METHODOLOGY

5. TIMELINE AND PROJECT PLAN

6. BIBLIOGRAPHY/REFERENCE


3/12

1. INTRODUCTION

Darkness can simply be put as partly or completely

without light.

It could also be described as opaque. Hence its existence in a room or else where (indoor)

makes the indication of any object very difficult, since

the eye cannot see through.

For example, when someone is in a room and suddenlythe light in the room goes off or darkness falls, it

becomes very uneasy for the person to indicate/locate

the exit/entrance.


4/12

INTRODUCTION CONTD.

Hence, this project aims to design and construct an

automatic exit indicator with alarm which would be

placed at the top of the exit.


5/12

2. PROBLEM STATEMENT

It is very difficult for someone to indicate the exit when

darkness falls suddenly in a room.

Because of this, a lot of time is wasted going round a

room trying to locate the exit/entrance.

An accident can occur as a result of the struggle to

indicate/locate the exit/entrance.


6/12

3. PROJECT OBJECTIVES

With this device positioned at the top of the exit, thesimultaneous action of the lighting and the alarming

system will;

Create the awareness of the existence of anexit/entrance

Help reduce the time used in indicating/locatingthe exit/entrance

Help eliminate the occurrence of an accident as aresult of the struggle to indicate the exit


7/12

4. METHODOLGY

VOLTAGE

COMPARATORTRANSISTOR RELAY

TRANSISTOR

RELAYOSCILLATOR LAMP

VOLTAGE

COMPARATOR

TRANSISTORRELAY OSCILLATOR

TRANSISTOR

SPEAKER

POWERSUPPLY

DARKSENSOR


8/12

METHODOLOGY CONTN. (Operation)

The circuit would be supplied by 12V D.C. battery. Areference voltage of 6V and a variable input of 5.5V would

be connected to inverting and non- inverting parts of thetwo comparators respectively.

Under normal circumstance when there is light in the room,the reference voltage Vrefwill be greater than thevariable/input Vv since the resistance of the LDR will not

increase and hence resulting in a low output of thecomparators.

This low voltage output will be insufficient to switch thetransistors ON and hence ,the circuit will be of in thepresence of light.


9/12

OPERATION CONTD.

In darkness, the resistance of the LDR increases, thereby

increasing the variable/input voltage to the non-invertingparts of the comparators.

This results in a high output voltage at the comparatorwhich switches ON the transistors.

Hence, the alarm and lighting circuits are switched ONsimultaneously, indicating the exit.


10/12

5. TIMELINE AND PROJECT PLAN

The timeline for the project is estimated to 5 months

ACTIVITY DURATIONInformationgathering

One (1) month

Design calculations Two (2) months

Circuit

design/development

One (1) month

Testing One(1) month


11/12

6. BIBLIOGRAPHY/REFERENCE

NAME AUTHOR(S) EDITION

ElectricalTechnology

B.L. TherajaA.K. Theraja

MulticolourIllustrative

Maplin Electronicscatalogue

Maplin Electronics August 2007-September 2008

Electronics

Principles

Albert Paul

Malvino

Fifth

www.tcil.india.com- -


12/12

THANK YOU VERY

MUCH FOR

YOUR,TIME

ATTENTION AND

COOPERATION.

Automatic Exit Indicator for Use in Darkness

Documents

Transcript of Automatic Exit Indicator for Use in Darkness