int greenPin = 13;
int redPin   = 12;
int bluePin  = 11;

String ledColor = "";
String msg1 = "Escribe un color de led";
bool rojo = false, 
        azul = false, 
        verde = false;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(greenPin, OUTPUT);
  pinMode(redPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  digitalWrite(greenPin, LOW);
  digitalWrite(redPin, LOW);
  digitalWrite(bluePin, LOW);
}


void loop() {
  // put your main code here, to run repeatedly:
  Serial.println(msg1);
  while (Serial.available() == 0) {
  }
  if (Serial.available() > 0) {
      ledColor = Serial.readString();
      ledColor.trim();  
      Serial.print(ledColor + " ");
      if (ledColor == "verde" || ledColor == "VERDE") {
        verde = !verde;
        Serial.println(verde);
        digitalWrite(greenPin, verde? HIGH : LOW);        
        digitalWrite(redPin, LOW);
        digitalWrite(bluePin, LOW);
      }

      if (ledColor == "rojo" || ledColor == "ROJO") {
        rojo = !rojo;
        Serial.println(rojo);
        digitalWrite(greenPin, LOW);
        digitalWrite(redPin, rojo ? HIGH: LOW);
        digitalWrite(bluePin, LOW);
      }

      if (ledColor == "azul" || ledColor == "AZUL") {
        azul = !azul;
        Serial.println(rojo);
        digitalWrite(greenPin, LOW);
        digitalWrite(redPin, LOW);
        digitalWrite(bluePin, azul ? HIGH : LOW);
      }
 }
}