const int relay = 8, ldr = A0, potensio = A1;
int nilaipns;
int nilaildr;

void setup() 
{
  pinMode(relay, OUTPUT);
  pinMode(ldr, INPUT);
  pinMode(potensio, INPUT);
  Serial.begin(9600);
}

void loop() 
{
  nilaipns = analogRead(potensio);
  nilaildr = analogRead(ldr);

  if (nilaildr < nilaipns)
  {
    digitalWrite(relay, HIGH);
  }
  else
  {
    digitalWrite(relay, LOW);
  }

  Serial.print("NPNS");
  Serial.println(nilaipns);
  Serial.print("NLDR");
  Serial.println(nilaildr);
  delay(500);
}