from machine import Pin
import time

# Define pins
pir_sensor = Pin(16, Pin.IN)  # PIR motion sensor on GP16
led = Pin(17, Pin.OUT)        # LED on GP17
buzzer = Pin(18, Pin.OUT)     # Buzzer on GP18

def alert():
    """Blink LED and turn on buzzer when motion is detected"""
    for _ in range(5):  # Blink LED 5 times
        led.on()
        buzzer.on()
        time.sleep(0.2)
        led.off()
        buzzer.off()
        time.sleep(0.2)

# Main loop
while True:
    if pir_sensor.value() == 1:  # Motion detected
        print("Motion detected!")
        alert()
    time.sleep(0.1)  # Small delay to optimize performance