import time
from machine import Pin
led=Pin("LED",Pin.OUT)
time.sleep(0.1) # Wait for USB to become ready
while(True):
    led.on()
    time.sleep(0.5)
    led.off()
    time.sleep(0.5)
    led.on()
    time.sleep(0.5)
    led.off()
    time.sleep(2)