// Pin connected to the LDR
const int ldrPin = A0;

// Pin connected to the LED
const int ledPin = 9;

void setup() {
  pinMode(ledPin, OUTPUT); // Set LED pin as output
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int ldrValue = analogRead(ldrPin); // Read the value from the LDR
  Serial.println(ldrValue); // Print the value to the serial monitor

  // Threshold value to turn on/off the LED
  int threshold = 500;

  if (ldrValue < threshold) {
    digitalWrite(ledPin, HIGH); // Turn on the LED
  } else {
    digitalWrite(ledPin, LOW); // Turn off the LED
  }

  delay(500); // Wait for a short time before taking the next reading
}