#define led  13
#define BD  2
#define BL  3

void setup() 
{
  pinMode(BL, INPUT_PULLUP);
  pinMode(led, OUTPUT);
  //pinMode(BD, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(BD), emergencia, CHANGE);
}

void loop() 
{
  if(digitalRead(BL)==0)
  {
    digitalWrite(led, 1);
    delay(10000);
    digitalWrite(led, 0);
    //if(digitalRead(BD)==0) digitalWrite(led, 0);
  }
}

void emergencia() 
{
 digitalWrite(led, 0);
}