int ldr = 0; //inisiasi variabel ldr nilai awal = 0 

void setup() {
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(A0, INPUT);
}

void loop() {
  Serial.begin(9600);
  ldr = analogRead(A0);
  Serial.println("LDR Value Is :");
  Serial.println(ldr);
  delay(10);
    
  if (ldr > 600)  //jika ldr diatas 600
    {                           
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    digitalWrite(3, LOW);
    }
  if (600 >= ldr & ldr >= 300) //jika ldr bernilai antara 600-300
    {                           
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    }

  if (ldr < 300)                      
   {
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
   }
  else {}
}