Abstract
This paper presents and implements an unauthorized object detector using ultrasonic waves. Ultrasonic refers to the waves with frequencies over 20 kHz. It is insensitive to human ears having audible perception range of 20 to 20 kHz. Thus, ultrasonic waves are useful for distance measurement in driverless cars. The distance can be measured by using two techniques; pulse echo and phase measurement methods. In this work, pulse echo method is considered where the target is detected via 'non-contact' technology. The Ultrasonic Module keeps monitoring and checks the echo reflected back by the entity to display the exact angle and distance on the screen. The novelty of this work is the development of an alert system that not only detects the target but also measures and displays its exact distance. PROTEUS software has been used for simulation. Hardware is also developed and tested to detect any entity in the prescribed range.