Ultrasonic pest repellent / Selena Abdul Rahman and Siti Nur Hasinah Johari

The project is about an ultrasonic pest repellent. The device is compact, cheap, and it does not cause any pollution unlike the other chemical repellents. This product repels pests by emitting high frequency and short wavelength sound waves that are too high in pitch for humans and even some animals to hear. The circuit is simply a 555 timer IC connected as a square wave generator. Its base frequency is approximately 45 kHz, but the user can vary the range of frequency by manipulating the input voltage by using potentiometer. An addition of component which is Arduino UNO make the project is different than other ultrasonic pest repellent because we programmed the Arduino to on 3 different colors of LED which indicates the range of frequency. The range of frequency is monitored since there are different pest using different range of frequency. Different range of frequency also will cause different reaction of pest's behavior since the received sound signals are dissimilar. In this project, data from theoretical, simulation and experimental are collected and analyzed.