from machine import ADC, Pin
from time import sleep
photoPIN = 26

# handle all the (few) operations required to read light intensity 
# convert it into a percentage 

def readLight(photoGP):
    photoRes = ADC(Pin(26)) 
    light = photoRes.read_u16()
    light = round(light/65535*100,2)
    return light 
  
while True:
  print("light: " + str(readLight(photoPIN)) +"%")
  sleep(1) # set a delay between readings