//Header section
int LED1=13;
int LED2=8;
int buz=3;
void setup()
{
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);

}

void loop()
{
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  tone(buz,2000);
  delay(500);//1000 MILISECOND

  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  tone(buz,1500);
  delay(500);//1000 MILISECOND

}