from time import *
from machine import *


led = Pin(13,Pin.OUT)
LDR = ADC(Pin(26))
trig = Pin(9,Pin.OUT)
echo = Pin(10,Pin.IN)
buzzer = PWM(Pin(18))
buzzer.freq(1000)

while True :
    light_value = LDR.read_u16()
    brightness = 65535 - light_value
    print('Light Value =',light_value, 'brightness =',brightness)

    trig.value(0)
    sleep_us(2)
    trig.value(1)
    sleep_us(10)
    trig.value(0)


    duration = time_pulse_us(echo,1)
    dis = (duration * 0.0343)/2
    print('duration =',duration,'distance =',dis,'cm')
   
    if brightness <= 10000 :

        if dis >50 :
            led.value(0)
            buzzer.duty_u16(0)

        elif dis > 20  and dis <= 50 :
            led.Value(1) 
            buzeer.value(0)

        elif dis >= 20 :
            led.value(1)
            buzeer.value(1)

    else :
        led.value(0)
        buzzer.duty_u16(0)
    sleep(0.1)