from machine import Pin
from utime import sleep

led_verde = Pin (15, Pin.OUT)
led_verm = Pin (16, Pin. OUT)
led_amar = Pin (17, Pin. OUT)

while(True):
    led_verde.on()
    led_amar.off()
    led_verm.off()
    sleep(1)

    led_verde.off()
    led_amar.on()
    led_verm.off()
    sleep(1)

    led_verde.off()
    led_amar.off()
    led_verm.on()
    sleep(1)