from machine import Pin
from utime import sleep

led_vermelho=Pin(16,Pin.OUT)
led_verde=Pin(15,Pin.OUT)
led_amarelo=Pin(17,Pin.OUT)

while (True):
    led_vermelho.on()
    sleep(0.9)
    led_verde.on()
    sleep(0.9)
    led_amarelo.on()
    sleep(0.3)