DESIGN A SMART INSECT REPELLER USING ULTRASONIC SENSOR …

Electronic pest control devices also provide a convenient means for controlling insects in or near your home. Ultrasonic Devices Ultrasonic is a term for the audio frequency range that is too high--more than 20,000 hertz--to be perceived by the human ear, but it can be perceived by insects and animals. Devices that emit ultrasonic sounds have long been used as a way to control misbehaving dogs ... ................
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