const int ldrpin = 13;
const int led1 = 12;
const int led2 = 11;
const int led3 = 10;
const int led4 = 9;

void setup(){
  pinMode(ldrpin, INPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
}
void loop() {
  int data=digitalRead(ldrpin);
if (ldrpin>=1000){
    digitalWrite(12, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(9, HIGH);

  }
else {
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
  
  }
}