// Define constants for LDR pin and LED pin
const int ldrPin = A0;   // LDR connected to analog pin A0
const int ledPin = 13;   // LED connected to digital pin 13

// Define threshold value for light level
int threshold = 500;   // Adjust this value according to ambient light conditions

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

void loop() {
  int lightLevel = analogRead(ldrPin);  // Read LDR sensor
  
  Serial.print("Light Level: ");
  Serial.println(lightLevel);   // Print the light level to serial monitor for debugging
  
  // Check if light level is below the threshold
  if (lightLevel < threshold) {
    digitalWrite(ledPin, HIGH);   // Turn on the LED
  } else {
    digitalWrite(ledPin, LOW);    // Turn off the LED
  }
  
  delay(100);   // Delay for stability, adjust as needed
}