void setup() {
  pinMode(15, OUTPUT);
pinMode(2, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(14, OUTPUT);
pinMode(27, OUTPUT);
}

void loop() {
 digitalWrite(15, HIGH);
 delay(1000);
 digitalWrite(15, LOW);

 digitalWrite(2, HIGH);
 delay(1000);
 digitalWrite(2, LOW);

 digitalWrite(4, HIGH);
 delay(1000);
 digitalWrite(4, LOW);

 digitalWrite(5, HIGH);
delay(1000);
digitalWrite(13, LOW);

digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);

digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);

digitalWrite(14, HIGH);
delay(1000);
digitalWrite(14, LOW);

digitalWrite(27, HIGH);
delay(1000);
digitalWrite(27, LOW); 
}