from machine import Pin
import utime
import urandom

led = Pin(25, Pin.OUT) # GPIO12o͂ɐݒ
urandom.seed(utime.time()) # 

while True:
    # LED_
    led.on()
    # _ɑ҂(100`800ms)
    utime.sleep_ms(int(urandom.random() * 700) + 100)
    # LED
    led.off()
    # _ɑ҂(100`800ms)
    utime.sleep_ms(int(urandom.random() * 700) + 100)