from machine import Pin
from time import sleep
#declaring GPIO2 as an OUTPUT pin.
led=Pin(2,Pin.OUT)
while True:
#strobe light effect,
#such on the aeroplane.
    led.value(0)
    sleep(0.5)
    led.value(1)
    sleep(0.5)
    led.value(0)
    sleep(0.5)
    led.value(1)
    sleep(2)