#convert ldr reading to voltage
from machine import Pin,PWM,ADC
from time import sleep

frequency=5000
led=PWM(Pin(21),frequency)
#led=Pin(2,Pin.OUT)
ldr=ADC(Pin(14))
ldr.width(ADC.WIDTH_10BIT)
ldr.atten(ADC.ATTN_11DB)
while True:
   ldrvalue=ldr.read()
   led.duty(ldrvalue)
   print(ldrvalue)
   print("volts:",ldrvalue*(3.3/1024))
   sleep(0.5)