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Piezoelectric speakers are frequently used as beepers in watches and other electronic devices. In this project, a piezo speaker is used to play melodies. It sends a square wave of the appropriate frequency to the piezo, generating the corresponding tone.
Connect the red wire of a piezo speaker to Arduino's PWM pin 9, and the black wire to ground. Use the Arduino code "Melody" to play different notes.
Created on April 16, 2009, 11:32