from machine import Pin
import utime

RED_PIN = 0
YELLOW_PIN = 1
GREEN_PIN = 2

red_led = Pin(RED_PIN, Pin.OUT)
yellow_led = Pin(YELLOW_PIN, Pin.OUT)
green_led = Pin(GREEN_PIN, Pin.OUT)

while True:
    red_led.value(1)
    yellow_led.value(0)
    green_led.value(0)
    utime.sleep(5)

    red_led.value(0)
    yellow_led.value(1)
    green_led.value(0)
    utime.sleep(2)

    red_led.value(0)
    yellow_led.value(0)
    green_led.value(1)
    utime.sleep(5)