//vars
int chave = 12, pir = 11, led = 8;
bool abertC, sense;

void setup() {

  pinMode(chave, INPUT);
  pinMode(pir, INPUT);
  pinMode(led, OUTPUT);

}

void loop() {

  abertC = digitalRead(chave);
  sense = digitalRead(pir);

  if(abertC){
    digitalWrite(led, sense);
  }else{
    digitalWrite(led, !sense);
  }
}