Kode2

int i;
char reader[10];

void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT);
  Serial.begin(9600);
  delay(2000);

}

void loop () {
  if (Serial.available() > 1) {
    for (i = 1; i < 10; i++) {
      reader[i] = Serial.read();
      delay(2);
    }
  }

  if (reader[0] == '2' && reader[1] == '0' && reader[2] == 'N'){
    digitalWrite(13, HIGH);
    delay(500);
    Serial.print("AON");}

  if (reader[0] == '2' && reader[1] == '0' && reader[2] == 'F'&&reader[3]=='F'){
    digitalWrite(13, LOW);
    delay(500);
    Serial.print("AOFF");}



  for (i = 0; i < 10; i++)
    reader[i] = 0;

}