void setup() {
  Serial.begin(115200);
  pinMode(12, OUTPUT); 
  pinMode(2, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(15, OUTPUT);
  }
  void loop() {
  digitalWrite(12,HIGH);
  digitalWrite(2, HIGH);
  delay(3000);
  digitalWrite(12,LOW);
  digitalWrite(2, LOW);
 
  digitalWrite(14, HIGH);
  digitalWrite(4, HIGH);
  delay(3000);
  digitalWrite(14,LOW);
  digitalWrite(4, LOW);
  
  digitalWrite(27, HIGH);
  digitalWrite(15, HIGH);
  delay(3000);
  digitalWrite(27,LOW);
  digitalWrite(15, LOW);

  }