int ldrPin = A0;      // LDR connected to analog pin A0
int ledPin = 9;       // LED connected to digital pin 9
int ldrValue = 0;     // Variable to store LDR value
int threshold = 500;  // Light level threshold (adjust as needed)

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

void loop() {
  ldrValue = analogRead(ldrPin);  // Read LDR value (0–1023)

  Serial.print("Light Intensity: ");
  Serial.println(ldrValue);

  // Control LED
  if (ldrValue < threshold) {
    digitalWrite(ledPin, HIGH);  // Turn LED ON when dark
  } else {
    digitalWrite(ledPin, LOW);   // Turn LED OFF when bright
  }

  delay(500);  // Small delay for readability
}