void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  // Traffic light A
  pinMode(27, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(12, OUTPUT);
  // Traffic light B
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(15, OUTPUT);
}

void loop() {
  // Traffic light A 
 
  digitalWrite(27, HIGH);
  digitalWrite(14, LOW);
  digitalWrite(12, LOW);
  delay(2000);  
  
  digitalWrite(27, LOW);
  digitalWrite(14, HIGH);
  delay(1000);  
  
  digitalWrite(14, LOW);
  digitalWrite(12, HIGH);
  delay(3000);  
  
  digitalWrite(4, HIGH);
  digitalWrite(2, LOW);
  digitalWrite(15, LOW);
  delay(2000);  
  
  digitalWrite(4, LOW);
  digitalWrite(2, HIGH);
  delay(1000);  

  digitalWrite(2, LOW);
  digitalWrite(15, HIGH);
  delay(3000);  

}