from time import sleep
from machine import ADC, Pin

sleep(0.1) # Wait for USB to become ready

ldr = ADC(Pin(26))

while True:
    raw_value = ldr.read_u16() #value between 0-65535
    light_level = 65535 - raw_value  # More lux(lighter) makes lower raw_value per default. This formula makes it more accurate: high light_value(lux) = lighter
    print(light_level)
    sleep(2)