const int ledpin = 12;
const int ldrpin = A0;
int threshold = 600;

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

void loop() {
int ldrstatus = analogRead(ldrpin);

  if(ldrstatus <= threshold){
    digitalWrite(ledpin, HIGH);
    Serial.print("its dark turn on led");
    Serial.println(ldrstatus);

  }else{
    digitalWrite(ledpin, LOW);
    Serial.print("its bright turn off light");
    Serial.println(ldrstatus);
  }
}