int threshold = 600;
void setup(){
  pinMode(2, OUTPUT);
  Serial.begin(9600);
  pinMode(A0, INPUT);
}
void loop(){
  int ldrStatus = analogRead(A0);
  if (ldrStatus <= threshold){
    digitalWrite(2, HIGH);
    Serial.print("Its DARK, Tum on the LED: ");
    Serial.println(ldrStatus);
  }
  else{
    digitalWrite(2, LOW);//turing off the led
    Serial.print("Its BRIGHT, Turn of the LED");
    Serial.println(ldrStatus);
  }
}