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IJSTR >> Volume 7 - Issue 12, December 2018 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Electronic Eye Using LDR

[Full Text]



Jeel Majithia, Yogendra Vaghela, Mihir Shah, Venkataramanan. V



Light Dependent Resistor (LDR), Buzzer, LED, Security system.



In today’s world, with the amount of crime rates it is important to secure our homes and work places. Electronic Eye is also known as magic eye. It makes sure that there is a constant watch on your doors. Imagine if you are alerted each time someone is trying to enter your home or work place. This helps you to take precaution before the damage has occurred. It is one of the most helpful devices in today’s security system. Electronic eye is a security system based on photo sensing arrangement. The circuit has two major parts. One being the power supply unit and the other is the logic unit. In the power supply unit 5 volt of power is obtained after its conversion from 9 volt. The logic unit consists of a Buzzer and Light Dependent Resistor (LDR). The logic unit works when a person is near the door. Light on the LDR determines the presence or absence of a shadow near the security system. When a shadow falls on the LDR, the sensor senses the absence of light and the buzzer goes off and the LED glows.



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