from machine import Pin
import utime

brocheLed = Pin(2,Pin.OUT)
EtatLed = False
start = utime.ticks_ms()
while (True) :
    instant = utime.ticks_ms()
    if (instant - start) >= 500 :
        EtatLed = not(EtatLed)
        print("Etat led =",EtatLed)
        brocheLed.value(EtatLed)
        start = instant