from machine import Pin, PWM
import time

pir = Pin(0, Pin.IN)
button = Pin(2, Pin.IN, Pin.PULL_DOWN)
buzzer = PWM(Pin(1))
system_active = False
last_button = 0
alarm_end_time = 0

def play_alarm():
    global alarm_end_time
    alarm_end_time = time.ticks_add(time.ticks_ms(), 5000)

    while time.ticks_diff(alarm_end_time, time.ticks_ms()) > 0:
        #1 KHZ
        buzzer.freq(1000)
        buzzer.duty_u16(30000)
        time.sleep(0.5)

        #2.5 KHZ
        buzzer.freq(2500)
        buzzer.duty_u16(30000)
        time.sleep(0.5)

    buzzer.duty_u16(0)  # stop sound

while True:
    current = button.value()

    #ON OFF BUTTON
    if current == 1 and last_button == 0:
        system_active = not system_active
        print("System Activation Status:", system_active)
        time.sleep(0.3)  

    last_button = current

    #MOTION DETECTED
    if system_active and pir.value() == 1:
        print("Motion Detected")
        play_alarm()

    time.sleep(0.1)