Design and Implementation of an Ultrasonic Insects Repellent

Z. Z. Muhammad, A. Y. Kassim, S. A. Mikail

Abstract


The ultrasonic insect repellent circuit was designed and implemented using ultrasonic frequency generators and other electronics components. The developed circuit generates high frequencies (that is ultrasound) which are capable of repelling insects in homes, offices, hostels, hospitals, etc. The repelling circuit operates at a frequency higher than Human audibility (>20KHz). It was established that insects react at different frequencies, hence the design was made to operate at the established insects repelling frequencies (29 KHz and 33-43 KHz). Thus, to ensure effective operation, the frequency of ultrasonic oscillator was continuously varied within the established limits in a step wise manner automatically in these design. This was achieved using the output clock pulse of IC1 NE555 (which was used as a Square wave low-frequency oscillator in the design), and the high logic output of IC2 CD4017 (a decade counter) alternates from Q0 to Q9. Ten resistors R3 to R13 (each connected at Q0 to Q9 output pins) were fixed for alternate values and connected to pin 7 of IC3 (NE555) electronically. IC3 is an astable multivibrator operating at a frequency of about 44 KHz. Its output is then used to drive high-frequency piezo tweeter which in turn produce the ultrasonic sound that repelled the insect

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References


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