A simple buzzer example using analogWrite

    /*

    Example 13.0

    Drive a piezoelectric buzzer with Arduino

    http://tronixstuff.wordpress.com/tutorials > Chapter 13

    */

    void setup()

    {

         pinMode(8, OUTPUT);   // sets the pin as output

    }

    void loop()

    {

         analogWrite(8,128);

         delay(500);

         digitalWrite(8, LOW);
         delay(500);
    }

analogwrite buzzer piezo ton