const int ledPins = 8;
const int ldrPin = 2;

void setup() {
  // put your setup code here, to run once:
pinMode(ledPins, OUTPUT);
pinMode(ldrPin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(ldrPin) == LOW) {
    digitalWrite(ledPins, LOW);
    delay(500);
  }
  else {
    digitalWrite(ledPins, HIGH);
    delay(500);
  }
}