from machine import Pin
from time import sleep

red = Pin(17, Pin.OUT)
orange = Pin(16, Pin.OUT)
green = Pin(4, Pin.OUT)

while True:
    green.value(1)
    sleep(3)
    green.value(0)
    orange.value(1)
    sleep(1)
    orange.value(0)
    red.value(1)
    sleep(5)
    red.value(0)