# Motion detection project 

from machine import Pin, Timer,PWM
import utime

# Define GPIO pins
pir_pin = 21  # PIR sensor output pin
led_pin = 20  # LED pin
buzzer_pin= 2

# Initialize PIR sensor, LED, and Timer
pir_sensor = Pin(pir_pin, Pin.IN)
led = Pin(20, Pin.OUT)
motion_timer = Timer()
buzzer = PWM(Pin(buzzer_pin, Pin.OUT), freq=1000)

# Function to detect motion and turn on the LED
def detect_motion(pin_value):
    if pir_sensor.value() == 1:
        print("Motion Detected!")
        buzzer.duty_u16(100)
        led.on()
        motion_timer.deinit()  # Stop the timer (if running)
        motion_timer.init(mode=Timer.ONE_SHOT, period=5000, callback=turn_off_led)

# Function to turn off the LED after 10 seconds
def turn_off_led(timer):
    print("No Motion Detected for 5 seconds.")
    buzzer.duty_u16(0)
    led.off()

# Attach the function interupt request (irq) with PIR sensor output when pin rises or captures movement
pir_sensor.irq(trigger=Pin.IRQ_RISING, handler=detect_motion)

# Infinite loop to keep the program running
while True:
    utime.sleep_ms(10)  # Small delay for stability