Design Of Ultrasonic Alarm System

Mohd Hafizy, Ahmad (2005) Design Of Ultrasonic Alarm System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This alarm system is created to detect an object movement in the coverage area. Alarm will trigger when object movement is detected. Nowadays, a lot of crimes happened in our life. The idea for this alarm project came out through the total of frustration when there is no other ways to stop burglary from break-in into the house, shop or car. Of course safety was the prime concern of the security system companies. However, house owners cannot rely on neighbours or police for protecting their home or warning them if a break-in has occurred in progress. To overcome this problem, an ultrasonic security system has been developed in this project. The system has a sensor that can detect an object movement in the covered area. This project consists of 6 parts of circuit which is the power supply circuit, the battery indicator circuit, the ultrasonic sensor circuit, the alarm circuit, the remote control circuit and the LCD display circuit. The power supply circuit produces and supply the 12V and 5V voltages. The battery indicator circuit is used to show the level of energy in the battery. The battery will act up if something happen to the power supply such as blackout. Ultrasonic sensor circuit has a transmitter circuit and the receiver circuit that operate at the same frequency level namely 40 kHz. When there's a movement in the area covered by the circuit, the circuit's fme balance will be disturbed, thus trigger its alarm. The circuit is very sensitive and can be adjusted automatically or to stay triggered until it is reset manually after an alarm. Actually, this project use low costs budget and it is suitable for commercial used. From this project, found that the maximum distance that ultrasonic sensor can detect the object movement is 3.5 meters and for the sensitivity, it depend the environment factors such as air and noise.

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