Blink LED from serial

serial port blink blink

int incomingByte = 0;  // para el byte leido
int biggreen = 7;
int red = 8;
int green = 9;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(biggreen, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly: 
  // envia datos solamente cuando recibe datos
  if (Serial.available() > 0) {
    // lee el byte entrante:
    incomingByte = Serial.read();

    // dice lo que ha recibido:
    Serial.print("He recibido: ");
    Serial.println(incomingByte, DEC); 
    if(incomingByte == 55) {
      digitalWrite(biggreen, HIGH);
    }
    
    if(incomingByte == 56) {
      digitalWrite(red, HIGH);
    }
    
    if(incomingByte == 57) {
      digitalWrite(green, HIGH);
    }
    delay(100);
    digitalWrite(biggreen, LOW);
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
  }
}