const int ledpin = 13;
const int LDRpin = A1;
int LDR_val;

void setup(){
  Serial.begin(9600);
  pinMode(ledpin, OUTPUT);
  pinMode(LDRpin, INPUT);
}

void loop(){
  LDR_val = analogRead(LDRpin);

  if(LDR_val <= 500){
    digitalWrite(ledpin,HIGH);
    Serial.print("It's Bright, Current Light intensity value :: ");
    Serial.println(LDR_val);
  }
  else{
    digitalWrite(ledpin,LOW);
    Serial.print("It's Dark, Current Light intensity value :: ");
    Serial.println(LDR_val);
  }
}