from machine import Pin,ADC 
from time import sleep

ldr=ADC(26)
led=Pin(1,Pin.OUT)
led2=Pin(2,Pin.OUT)
led3=Pin(3,Pin.OUT)
while True:
    a=ldr.read_u16()
    print(a)
    sleep(1)
    if a>400 and a<3000:
        led.value(1)
        led2.value(0)
        led3.value(0)
    elif a>3000 and a<12000:
        led.value(0)
        led2.value(1)
        led3.value(0)
    else:
        led.value(0)
        led2.value(0)
        led3.value(1)