const int R=4;
  const int G=5;
  const int Y=15;

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

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(R, HIGH);
  digitalWrite(G, LOW);
  digitalWrite(Y, LOW);
  Serial.println("Red");
  delay(10000);
  //else{
  digitalWrite(R, LOW);
  digitalWrite(G, HIGH);
  digitalWrite(Y, LOW);
  Serial.println("Green");
  delay(10000);
  digitalWrite(R, LOW);
  digitalWrite(G, LOW);
  digitalWrite(Y, HIGH);
  Serial.println("Yellow");
  delay(10000);
  //}

// this speeds up the simulation
}