void setup() {
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
tone(9, 500);
}

void loop() {
digitalWrite(13, HIGH);
delay(50);
digitalWrite(13, LOW);
delay(100);
digitalWrite(12, HIGH);
delay(50);
digitalWrite(12, LOW);
delay(100);
digitalWrite(11, HIGH);
delay(50);
digitalWrite(11, LOW);
delay(100);
digitalWrite(10, HIGH);
delay(50);
digitalWrite(10, LOW);
delay(200);
tone(9,500);
delay(100);


}