RANCANG BANGUN SISTEM SONAR BERBASIS MIKROKONTROLER UNTUK PENGUKURAN KEDALAMAN DASAR AIR DENGAN TAMPILAN KOMPUTER

Sonar system has been designed using the system microcontroller and a computer for data processing. The purpose of this study to determine the depth of water-based object.The experiment was conducted in several stages of manufacture and application of ultrasonic pulse generator sonar system. Microcontroller is used as a trigger pulse to the IC 74HC221 the resulting pulse amplified by the amplifier so that the sensor could shotting of ultrasonic waves. Time of flight can be determined by calculate the time delay when pulse emitted and then received back. Received signal will experience a strengthening of the LF356 and comparated by comparator LM339 then transmitted by the microcontroller to the computer via RS-232. This system has been realized and can show the results obtained in the form of graphs and can be stored. Results of testing equipment and the characteristics of the sensor with a linear correlation coefficient R2 = 0,999 and SD = 0,438 against the standard instrument