void setup() {
  pinMode( 6 , OUTPUT);  // Must be a PWM pin
  
}

void loop() {

  int i = 0;
  
  if (i == 0)
  {
      analogWrite( 6 , 180 );  // 60% duty cycle
      delay(2000);              // play for 0.5s
  }

  analogWrite( 6 , 0 );    // 0% duty cycle (off)
  delay(2000);             // wait for 4s

}