void setup()
{
    pinMode(9, OUTPUT);
}
void play (int cnt) 
{
    for (int i = 1; i <= 3; i += 1) 
    {
        tone(9, 140);
        delay(cnt);
        noTone(9);
        delay(cnt);
    }
}
void loop()
{
    play(500);
    delay(300);
    play(250);
    delay(300);
}