int light = 0;
void setup() {
  
  // put your setup code here, to run once:
pinMode (A0, INPUT);
pinMode (13, OUTPUT);
Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
light = analogRead(A0);
if (light > 500){
  Serial.print(light);
  digitalWrite(13, HIGH);
}
else {
  Serial.println(light);
  digitalWrite(13, LOW);
}
delay(1000);
}