#define D2   2
#define LED1 27
#define LED2 14
#define LED3 12
#define LED4 13

//int myCount = 0;

String prompt = "Escribe el led que desea encender";

String led1;
String led;

void setup() {
  Serial.begin(115200);

  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);

  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED3, LOW);
  digitalWrite(LED4, LOW);
}

void loop() {
  Serial.println(prompt);

  while(Serial.available() == 0){} //espera entrada de datos
  led = Serial.readString();
  led.remove(4, 2);//  This Line Remove the \r\n characters at the end of the string 
  //led = led1;
  Serial.println(led);

  if(led.equals("LED1")){
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
    digitalWrite(LED4, LOW);
  } else {
    Serial.println("else1");
    if(led == "LED2"){
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, HIGH);
      digitalWrite(LED3, LOW);
      digitalWrite(LED4, LOW);
    } else{
      Serial.println("else2");
      if(led == "LED3"){
        digitalWrite(LED1, LOW);
        digitalWrite(LED2, LOW);
        digitalWrite(LED3, HIGH);
        digitalWrite(LED4, LOW);
      } else {
        Serial.println("else3");
        if(led == "LED4"){
          digitalWrite(LED1, LOW);
          digitalWrite(LED2, LOW);
          digitalWrite(LED3, LOW);
          digitalWrite(LED4, HIGH);
        } else{
          Serial.println("else4");
          digitalWrite(LED1, LOW);
          digitalWrite(LED2, LOW);
          digitalWrite(LED3, LOW);
          digitalWrite(LED4, LOW);
          Serial.print(led);
          Serial.println(" no encontrado");
          }
        }
      }
    }
  delay(500);
}