from machine import Pin

motion_sensor = Pin(12, Pin.IN)
led = Pin(2, Pin.OUT)
led_status = False

while True:
    motion_sensor_status = motion_sensor.value()
    if motion_sensor_status == 1 and not led_status:
        led.value(1)
        led_status = True
    elif motion_sensor_status == 0 and led_status:
        led.value(0)
        led_status = False