import utime
import machine

led = machine.Pin(15, machine.Pin.OUT)
ldr = machine.Pin(14, machine.Pin.IN, machine.Pin.PULL_DOWN)

while True:
    if ldr.value():
        led.value(1)
        print('on')
        utime.sleep_ms(1000)
    else:
        led.value(0)
        print('off')
        utime.sleep_ms(1000)