void setup() {

pinMode(15,OUTPUT);
pinMode(2,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(18,OUTPUT);

}

void loop() {

digitalWrite(15, HIGH);
digitalWrite(2, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(18, HIGH);
delay(1000);

digitalWrite(15, LOW);
digitalWrite(2, LOW);
digitalWrite(4, LOW);
digitalWrite(5, LOW);
digitalWrite(18, LOW);
delay(1000); 

}