from machine import ADC, Pin
import time
import math

ldr = ADC(26)

led = Pin(15, Pin.OUT)

buzzer = Pin(14, Pin.OUT)

button = Pin(16, Pin.IN, Pin.PULL_DOWN)

system_on = True

while True:

   
    if button.value() == 1:
        system_on = not system_on

        print("System ON" if system_on else "System OFF")

        time.sleep(0.5)

    if system_on:

        raw = ldr.read_u16()

        v = raw / 65535 * 5

        r = 2000 * v / (1 - v / 5)

        lux = pow((50000 * pow(10, 0.7) / r), (1 / 0.7))

        print("Light Intensity: {:.2f} lux".format(lux))


        if lux > 300:

            led.off()
            buzzer.off()

            print("Bright Area")

    
        elif lux > 100:

            led.on()
            buzzer.off()

            print("Dim Light")

        
        else:

            print("Intruder Alert Mode")

            led.on()

        
            buzzer.on()
            time.sleep(0.2)

            buzzer.off()
            time.sleep(0.2)

            buzzer.on()
            time.sleep(0.2)

            buzzer.off()

    else:

        led.off()
        buzzer.off()

    time.sleep(0.5)