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ABSTRACT
This project is about the development of sonar sensor in pupose for Autonomous Undewater Vehicles (AU) application. The concept of this project is using the ultrasonic sensor as a main device to nsmit and receive the sinal from the obstacle. The ultrasonic sensor will be combined to the ultrasonic circuit. Usually, the ultrasonic sensor is oten used in robots for obstacle avoidance, map building nd especially in navigation. Ultrasonic rnge sensor is works by emiting a shot burst of 40 Hz sound also known as a "ping" sound ulrasonic sound rom ultrasonic sensor. In ddition, a small amount of sound energy is relected by objects in ront the device nd retuned to the detector or the receiver. The receiver sends his relected signal known as echoes to the microcontroller to detemine how far away the objects. However, to know how far away the objects it is using the speed of sound and time it took for the sinal to be relected. Unfotunately, echoes re not completely a product of distance. There are mny other factors that can alter readings. Diferent the medium will give the diferent speed and diferent result.
