#define LDR_PIN A0

void setup() {
  Serial.begin(9600);
  pinMode(LDR_PIN, INPUT);
}

void loop() {
  int analogValue = analogRead(A0);
      Serial.println(analogValue);

    if (analogValue > 300) {
      // Turn the built-in LED on
      digitalWrite(13, HIGH);
        delay(500);


  } else {
      digitalWrite(13, LOW);
        delay(250);

  }
  delay(500);
}