void setup() 
{ 
  pinMode(13, OUTPUT);
   pinMode(12, OUTPUT); 
    pinMode(11, OUTPUT);
     pinMode(10, OUTPUT);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  }
 void loop() 
 {
  digitalWrite(10, HIGH);
  digitalWrite(11, HIGH); 
  digitalWrite(12, HIGH);
  digitalWrite(13, HIGH); 
  delay(1000); 
  digitalWrite(10, HIGH);
  digitalWrite(11, LOW); 
   digitalWrite(12, LOW);
   digitalWrite(13, LOW); 
    delay(1000); 
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);  
    digitalWrite(12, LOW);
    digitalWrite(13, LOW); 
     delay(1000); 
     digitalWrite(10, LOW);
     digitalWrite(11, LOW); 
      digitalWrite(12, HIGH);
     digitalWrite(13, LOW);  
     delay (1000); 
      digitalWrite(10, LOW);
      digitalWrite(11, LOW); 
      digitalWrite(12, LOW);
      digitalWrite(13, HIGH); 
       delay(1000);  
       digitalWrite(10, LOW);
       digitalWrite(11, LOW);
       digitalWrite(12, LOW);
       digitalWrite(13, LOW); 
        delay(10);
 }