arduino

int i = 0;
#define ledIzq 4
#define ledDer 5
#define ledArr 6
#define ledAba 7
#define motor 13

// the setup routine runs once when you press reset:
void setup() {
  Serial.begin(9600);
  for (i=4; i<=7; i++){
       pinMode(i, OUTPUT);
  }

}

// the loop routine runs over and over again forever:
void loop() {
  if(Serial.available()) {
    char in = Serial.read();

    if(in == 'U'){
        digitalWrite(ledArr, HIGH);
        digitalWrite(ledAba, LOW);
        digitalWrite(ledDer, LOW);
        digitalWrite(ledIzq, LOW);
        digitalWrite(motor, HIGH);
        delay(2000);
        digitalWrite(ledArr, LOW);
        digitalWrite(motor, LOW);
    }

    if(in == 'D'){
        digitalWrite(ledArr, LOW);
        digitalWrite(ledAba, HIGH);
        digitalWrite(ledDer, LOW);
        digitalWrite(ledIzq, LOW);
        digitalWrite(motor, HIGH);
        delay(1000);
        digitalWrite(ledAba, LOW);
        digitalWrite(motor, LOW);
    }

    if(in == 'R'){
        digitalWrite(ledArr, LOW);
        digitalWrite(ledAba, LOW);
        digitalWrite(ledDer, HIGH);
        digitalWrite(ledIzq, LOW);
        digitalWrite(motor, HIGH);
        delay(1000);
        digitalWrite(ledDer, LOW);
        digitalWrite(motor, LOW);
    }

    if(in == 'L'){
        digitalWrite(ledArr, LOW);
        digitalWrite(ledAba, LOW);
        digitalWrite(ledDer, LOW);
        digitalWrite(ledIzq, HIGH);
        digitalWrite(motor, HIGH);
        delay(1000);
        digitalWrite(ledIzq, LOW);
        digitalWrite(motor, LOW);
    }

  }
}