int LDR = A2;
int LED = 13;
int nilaiLDR = 0;
void setup() {
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}
void loop() {
  nilaiLDR = analogRead(LDR);
  Serial.print("nilaiLDR = ");
  Serial.println(nilaiLDR);
  if (nilaiLDR < 500) {
    digitalWrite(LED, HIGH);
  }
  else{
    digitalWrite(LED, LOW);
  }
}