from machine import Pin
from utime import sleep

pir_pin = Pin(22, Pin.IN)
led_pin = Pin(21, Pin.OUT)

previous_state = 0

while True:
    current_state = pir_pin.value()

    if current_state == 1 and previous_state == 0:
        print("⚠️ Motion detected!")
        led_pin.value(1)
    elif current_state == 0 and previous_state == 1:
        print("✅ Motion ended.")
        led_pin.value(0)

    previous_state = current_state
    sleep(0.1)  # 100ms poll interval