from machine import Pin,ADC,PWM
from time import sleep
ldr = ADC(Pin(14))
ldr.atten(ADC.ATTN_11DB)
led_pwm = PWM(Pin(2),5000)
while 1:
    ldr_value=ldr.read()
    print("ldr_value is:" ,ldr_value)
    #sleep(0.5) 
    voltage=ldr_value * (3.3/4095)
    print("voltage is:",voltage)
    #sleep(0.5)
    led_pwm.duty(1023 - ldr_value)
    sleep(0.5)