byte LED_PIN = 4;

void setup() {
  // put your setup code here, to run once:

  Serial.begin(9600);
  pinMode(LED_PIN, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available())
  {
    int d_time = Serial.parseInt();
    if (d_time != 0)
    {
      d_time *= 100;
      blink(d_time);
    } 

    else if(d_time > 10)
    {
      Serial.println("waktu terlalu besar");
    }

    else
    {
      Serial.println("Error kids");
    }
  }


}

void blink(int time)
{
  digitalWrite(LED_PIN, HIGH);
  delay(time);
  digitalWrite(LED_PIN, LOW);
  delay(time);

}