Learn_Interrupt

int led = 13;
int x = 10;
byte jacare;
//----------------------------------
void emergencia()
{
  jacare = 1;
  Serial.println("Emergencia");
}
//----------------------------------
void setup()
{
  pinMode(led, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  digitalWrite(2, 1);
  Serial.begin(9600);
  attachInterrupt(0, emergencia, FALLING);
}
//-----------------------------------
void loop() {
  for (int i = 0; i < x; i++)
  {
    Serial.println(i);
    delay(500);
    if (jacare == 1)
    {
      digitalWrite(led, LOW);
      delay(500);
      digitalWrite(led, HIGH);
      delay(500);
      digitalWrite(led, LOW);
      delay(500);
      digitalWrite(led, HIGH);
      delay(500);

      jacare = 0;
    }
  }
}