int ledPin = 8;          // LED is connected to pin 9
int ldrPin = A0;         // LDR is connected to analog pin A0
int ldrValue = 0;        // Variable to store LDR value

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

void loop() {
  ldrValue = analogRead(ldrPin);   // Read light level
  Serial.println(ldrValue);        // Display the value for reference

  if (ldrValue < 500) {      // If it’s dark
    digitalWrite(ledPin, HIGH);  // Turn on the LED
  } else {
    digitalWrite(ledPin, LOW);   // Turn off the LED
  }

  delay(500);  // Pause for half a second
}