This work is titled design and construction of a shadow detector with an alarm. This system sounds an alarm whenever a shadow falls on it. Shadow alarms are widely used for security purposes. Project can be easily installed on the windows and doors. This circuit demonstrates the principle and operation of a simple shadow alarm using LDR. So it can be used at night by shopkeepers to protect the valuables in their showrooms. A dim lighting in the room is necessary to detect the moving shadow. Unlike opto-interruption alarms based on light-dependent resistors (LDRs), it does not require an aligned light beam to illuminate the photo-sensor.
The circuit is powered by a 9V power supply and uses the most sensitive photo-sensor L14F1 to detect shadows. It is portable and can be used at any place that is to be monitored.
CHAPTER ONE
1.1 INTRODUCTION
The need for having home protection has always been there. But in the recent times, considering a dramatic rise in petty crimes like robbery and theft, the need has been more strongly felt to have a fool proof protection of the belongings and the family members. Home security has come a long way in the last few decades. It was in the hands of a guard who manually provided surveillance during nights in the earlier days, but it was not fool proof as it was only normal for him to have momentary lapse of concentration.
The guard was also susceptible to sleep at times. It was then that home alarm system based upon electronic circuits were developed which proved to be highly reliable and were appreciated by the people as they were relieved from constant monitoring of their homes.
This shadow alarm system uses lm741 IC which was wired in an inverting mode, IC 741 was the most common Operational Amplifiers. as tone generator and amplifier to obtain a maximum audible sound. The lm741 IC power that is sent is to transistor which amplifies a loud speaker or buzzer.
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 construction in full. Chapter four is on result analysis. Chapter five is conclusion, 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 house and property owners when they out from their premises without much fear of intruder.
1.3 SIGNIFICANCE OF THE PROJECT
This device functions as an electronics watch dog. This device functions as a major security alarms used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders.
1.4 LIMITATION OF THE PROJECT
- The only problem noticed in this work is that even the shadow of an animals can also trigger the device just as human being shadow can also.
1.5 SCOPE OF THE PROJECT
The circuit is highly sensitive and can detect the shadow of the moving person from a distance of 1 meter. It does not require an aligned light beam to make the circuit standby. It is portable and can be places anywhere for monitoring. Light dependent resistor is used as the sensor. Its resistance depends on the intensity of light falling on it. In dark, its resistance will be very high about 10 Meg ohms. When light falls on LDR its resistance reduces to a few ohms.
1.6 PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to shadow detector alarm. In this chapter, the background, significance, objective limitation and problem of shadow detector alarm were discussed.
Chapter two is on literature review of shadow detector alarm. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.
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