from machine import Pin

#from time import sleep

from time import sleep_ms

led=Pin(2, Pin.OUT)

#while True:   
#  led.value(1)
#  sleep(1)
#  led.value(0)
#  sleep(1)

while 1:   
  led.on() #led亮
  sleep_ms(500)
  #led滅
  sleep_ms(500)