Electric Rat repellent

Students of Electrical Engineering, Faculty of Engineering, State University of Yogyakarta Soni Maringgih develop microcontroller-based mouse repellent devices that generate sound waves with very high or ultrasonic frequencies. 

"Rat repellent device that uses the frequency range of hearing in accordance with the limits of mice, but the upper limit of human hearing, so it is not harmful to humans," Soni said in Yogyakarta.

According to him, the tool is designed with two main parts of the device, namely software and hardware. The hardware consists of a system that serves as the main control, namely data processing and controlling the whole system.
"Put a key regulator and the output wave form of` `liquid crystal display (LCD) which serves to show how waves are generated and the` speakers `to remove the ultrasonic waves," he said.
He said the workings of the instrument begins with selecting the frequency via the frequency selector button presses that have been provided. The system will process the data that has been programmed and forward it to the transistor to be strengthened, further to the "speaker".
"Speaker" issuing an audible frequencies (10kHz and 15kHz), and which can not be heard (30kHz and 40kHz), then the LCD will display how many frequencies are issued by the circuit.
"Going forward, I still want to develop tools mouse repellent to expand the scope of these frequency bands. Thus, the tool can be used anywhere, because at this distance of the farthest reach of the tool was only about five meters," he said.