Security System Using Ultrasound

Security System Using Ultrasound

Security System

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A Security System Using Ultrasound has been proposed in this project. This project was implemented for a low cost security system. In this project the ultrasonic sensors were used to detect the moving object in small place. An ultrasonic transmitter was used which generated and transmitted a 40 KHz signal and an ultrasonic receiver was used which received this transmitted signal which is reflected from any object. A two stage amplifier and a comparator were used to amplify the received weak signal and compare with a reference voltage (5.5V). The comparator s output (High or Low) was fed to a m...