from machin import *
from time 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 ture:
    
    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(0.2)
    trig.value(0)

    duration = time_pulse_us(echo,1)

    dis = (duration * 0.0343)/2
    print('duration =',duration,'distance =',dis,'cm')
   
    if brightness <= 10000 :
        if distance >50 cm :
            led.value(0)
            buzzer.duty_u16(0)
        elif dis> 20 and dis<50 :
            led.value(1)
            buzzer.duty_u16(0)
        elif dis<20 :
            led.value(1)
            buzzer.duty_u16(2000)
    else :
        led.value(0)
        buzzer.duty_u16(0)
    sleep(0.1)