void setup() {
  //put your setup code here,to run once:
  Serial.begin(115200);
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(12, OUTPUT);
}

void loop() {
  digitalWrite(15, HIGH);
  digitalWrite(12, HIGH);
  delay(1000);
  digitalWrite(15, LOW);
  digitalWrite(12, LOW);
  delay(1000);
  digitalWrite(2, HIGH);
  digitalWrite(14, HIGH);
  delay(1000);
  digitalWrite(2,LOW);
  digitalWrite(14, LOW);
  delay(1000);
  digitalWrite(27,HIGH);
  digitalWrite(4,HIGH);
  delay(1000);
  digitalWrite(27, LOW);
  digitalWrite(4, LOW);
  delay(1000);
}