int  led=22;
int entrada;

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

void loop() {
  
  if (Serial.available()>0)
  {
    entrada=Serial.read();
    if (entrada =='3')
    {
      Serial.println("LED ENCENDIDO");
      digitalWrite(led, HIGH);
      delay(100);
    }
    if (entrada =='7')
    {
      Serial.println("LED APAGADO");
      digitalWrite(led, LOW);
      delay(100);
    }
  }
  
}