from machine import Pin,ADC
from machine import Pin
import utime
ldr_value =ADC(28)
relay=Pin(2,Pin.OUT)
while True:
    I=ldr_value.read_u16() 
    print(I)
    if I>18020:
        relay.value(1)
    else:
        relay.value(0)    
    utime.sleep(0.1)