from machine import Pin
from time import sleep_ms

led=Pin(25, Pin.OUT)

led.on()
sleep_ms(300)
led.off()
sleep_ms(300)

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


"""
for i in range(10):
    print(i)
    led.on()
    sleep_ms(300)
    led.off()
    sleep_ms(300)
"""