This shadow alarm circuit can sense a moving shadow in a confined area. It can be used to protect things from theft. When somebody approaches the unit, it will give a loud alarm to abort the attempt of theft. The circuit uses the light sensing property of the Photo diode.
The circuit uses the light sensing property of the PIN Photodiode. The p-n junction of the photo diode gives light current when it is forward biased, it is designed as a voltage comparator.
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 IC CA3130 which was wired in an inverting mode, IC CA3130 was the most common Operational Amplifiers. as tone generator and amplifier to obtain a maximum audible sound. The IC CA3130 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 using photodiode.
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 STUDY
- The only problem noticed in this work is that even the shadow of animals can also trigger the device just as human being shadow can also.
1.5 APPLICTION OF THE PROJECT
This device can be used in the following places:
- Homes
- Churches/mosque
- Garage
- Offices, or any other public place
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 an infrared shadow detector with an alarm. In this chapter, the background, significance, objective limitation and problem of an infrared shadow detector with an alarm were discussed.
Chapter two is on literature review of an infrared shadow detector with an 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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