from machine import ADC,Pin
from time import sleep
photoPIN = 28
def readLight(photoGP):
    photoRes = ADC(Pin(28))
    light= photoRes.read_u16()
    light=round(light/65535*100,2)
    return light
while True:
    print("Light: "+ str(readLight(photoPIN))+"%")
    sleep(1)