import time
from machine import ADC, Pin

ldr = ADC(0)             
R = 10000     
led = Pin(0, Pin.OUT)

def get_voltage(raw):
    return (raw * 3.3) / 65535 

def rtolux(rawval):
    vout = get_voltage(rawval)
    RLDR = (vout * R) / (3.3 - vout)
    lux = 500 / (RLDR / 1000)  
    return lux


DARK_THRESHOLD = 50  
    
while True:
    raw = ldr.read_u16()  
    volts = get_voltage(raw)
    luxval = rtolux(raw)
    print("raw = {:5d} volts = {:.2f} light = {:.2f}".format(raw, volts, luxval))
    
    led.value(luxval < DARK_THRESHOLD)
    time.sleep(1)