Arduino-PC Serial Communication (arduino code)

#define photo 0
#define LED 5

int val = 0;
int ledState = 0;
int counter = 0;

void setup(){
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop(){
  counter++;
  if(counter >= 10000){
    updatePhoto();
    counter=0;
  }

  if(Serial.available() >0){
    //read the incoming byte
    ledState = Serial.read();
  }

  if(ledState == 1){
    digitalWrite(LED, HIGH);
  }else{
    digitalWrite(LED, LOW);
  }

  //delay(100);
}

void updatePhoto(){
  val = analogRead(photo);
  Serial.println(val);
}