from machine import Pin 
  import time

pin_pir = Pin(12, Pin.IN)
pin_pir = Pin(13, Pin.OUT)

Wile trye:
if pin_pir.value() == 1:
    print"(Movimiento detectado")
    pin_rele.value(1)
    time.Sleep(5)
    pin_rele.value(0)
    time.sleep(0.1)