BibTeX:

@article{IJIRSTV2I11142,
     title={A Review on Ultrasonic Based Security System},
     author={Garima Pandey, Aditya Gupta and Dr. Pankaj Sharma},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={2},
     number={11},
     pages={476--480},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV2I11142.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

This paper presents the review of microcontroller and ultrasonic sonar based security system. Considering the high rate of crime and insecurity, there is an urgent need to design a security system that takes proper measure to prevent intrusion, unwanted and unauthorized user(s). Decoder, ultrasonic sonar, LCD and microcontroller as its main components to control the system. The result of these processes led to a security door which can be accessed by entering the corresponding keys of the assigned codes on the LCD screen or by entering the corresponding code. The system allows only that person who has a valid ID and at the same time unconscious the suspected person who is not having their ID proof. The designed system has been proven to be a reasonable advancement in access control and security system technology.

LCD, ultrasonic sonar, Atmega- 89s52, microcontroller, HT-12ed, opto-coupler, RF receiver