const int photoresistorPin = A0; 
const int ledPin = 13;        
const int threshold = 400;    

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

void loop() {
  int lightLevel = analogRead(photoresistorPin); 
  Serial.println(lightLevel); 

  if (lightLevel > threshold) {
    digitalWrite(ledPin, HIGH); 
  } else {
    digitalWrite(ledPin, LOW);  
  }
  
  delay(100); 
}