function setup() { }

function loop() {
    // Use the tone(pin, frequency, duration) function where
    // pin is the pin on which to generate tone: 9,
    // frequency is the frequency of the tone (Hz): 1000,
    // duration is the duration of which the tone lasts (milliseconds): 2000,
    tone(9, 1000, 5000);
    // Use the delay(duration) function to specify the duration
    // between 2 consecutive tones
    <Delay 2 seconds>;
}