void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(13,OUTPUT);
  pinMode(12,OUTPUT);
  pinMode(14,OUTPUT);
  pinMode(15,OUTPUT);
  pinMode(2,OUTPUT);
  pinMode(4,OUTPUT);
  Serial.println("Hello, ESP32!");
}

void loop() {
  digitalWrite(13,HIGH);
  digitalWrite(2,HIGH);
  delay(2000);
   digitalWrite(13,LOW);;
  digitalWrite(2,LOW);
  digitalWrite(12,HIGH);
  digitalWrite(15,HIGH);
  delay(2000);
   digitalWrite(12,LOW);
  digitalWrite(15,LOW);
  digitalWrite(14,HIGH);
  digitalWrite(4,HIGH);
  delay(2000);
   digitalWrite(14,LOW);
  digitalWrite(4,LOW);
  delay(2000);
  
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}