void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(13, OUTPUT);
  pinMode(23, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(2, OUTPUT);
   
}

void loop() {
  digitalWrite(23, HIGH);
  delay(1000);
  digitalWrite(23, LOW);
  delay(1000);

  digitalWrite(17, HIGH);
  delay(1000);
  digitalWrite(17, LOW);
  
  delay(1000);
  digitalWrite(13, HIGH);
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(13, LOW);
  digitalWrite(2, LOW);
  delay(1000);

}