Dog-gone-duino

Build an Arduino driven dog deterrent.​ -- Joseph LaBonde        "Does anyone have a suggestion for an Arduino driven speaker that can produce 23Khz-40Khz?I am setting up a motion sensor dog deterrent."            What you need is NOT a speaker, but a Piezoelectric Transducer!        * 40Khz (35 Watt)                NB: The "Piezoelectric Effect" is the phenomenon that occurs when a mechanical stress is applied to certain materials, resulting in an electric charge.        * Timing crystals (components) utilize this effect: They are "Crystal Oscillators" -- When a crystal (like quartz) is packaged in such a way as to compress the crystal, it will provide a stable "clock signal" for our digital IC projects.         * The effect can be REVERSED: If I run an electrical charge through a piezoelectric material, it will create a mechanical stress.        * In transducers, this mechanical stress become vibrations that in turn create sound waves.