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



}

void loop() {

digitalWrite(2, HIGH);  
delay(200);
digitalWrite(2, LOW);
delay(200); 

digitalWrite(2, HIGH);
delay(200);
digitalWrite(2, LOW);
delay(200); 

digitalWrite(2, HIGH);
delay(200);
digitalWrite(2, LOW);
delay(800); 

// -----O---
digitalWrite(2, HIGH);  
delay(600);
digitalWrite(2, LOW);
delay(200); 

digitalWrite(2, HIGH);  
delay(600);
digitalWrite(2, LOW);
delay(200); 

digitalWrite(2, HIGH);  
delay(600);
digitalWrite(2, LOW);
delay(800); 


//=====S======
digitalWrite(2, HIGH);  
delay(200);
digitalWrite(2, LOW);
delay(200); 

digitalWrite(2, HIGH);
delay(200);
digitalWrite(2, LOW);
delay(200); 

digitalWrite(2, HIGH);
delay(200);
digitalWrite(2, LOW);
delay(3000); 
}