const int LDR_PIN = A0; 
const int LED_PIN = 13; 
void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(9600);
}
void loop() {
  int lightValue = analogRead(LDR_PIN); 
  Serial.print("Light Value: ");
  Serial.println(lightValue);
  if (lightValue < 100) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);  
  }
  delay(500); 
}