The report details the implementation of distance measurement system using the

ultrasonic waves. As the human ear’s audible perception range is 20 Hz to 20 kHz, it is

insensitive to ultrasonic waves, and hence the ultrasound waves can be used for applications in

industries/vehicles without hindering human activity. They are widely used as range meters and

proximity detectors in industries also it can be used in parking assistance system. The distance

can be measured using pulse echo and phase measurement method. Here the pulse echo method

is used. The measurement unit uses a continuous signal in the transmission frequency range of

ultrasonic transducers. The signal is transmitted by an ultrasonic transducer, reflected by an

obstacle and received by another transducer where the signal is detected. The time delay of the

transmitted and the received signal corresponds to the distance between the system and the

obstacle.