from machine import Timer, Pin

def fun_pin (x):
    led.on()
    t1.init(period=100,mode=Timer.ONE_SHOT,callback=apaga)

def apaga (x):
    led.off()

led = Pin(23,Pin.OUT)
t0 = Timer(0)
t1 = Timer(1)
t0.init(period=500,mode=Timer.PERIODIC,callback=fun_pin)

while(1):
    pass