const int bl = 15;
const int bd = 4;
const int led = 14;

void setup(){

  pinMode(bl, INPUT);
  pinMode(bd, INPUT);
  pinMode(led, OUTPUT);

}

void loop(){
  
  unsigned int FlagAux = 1;

  while(1){

    if(digitalRead(bl) == 1 && FlagAux == 1){

      digitalWrite(led, HIGH);
      FlagAux = 0;
      delay(40);
    }

    if(digitalRead(bl) == 0 && FlagAux == 0){

      FlagAux = 1;
      delay(40);
    }

    if(digitalRead(bd) == 1 && FlagAux == 1){

      digitalWrite(led, LOW);
      FlagAux = 0;
      delay(40);
    }

    if(digitalRead(bd) == 0 && FlagAux == 0){

      FlagAux = 1;
      delay(40);
    }
  }
}