from machine import Pin
import time

led_red = Pin(1 , Pin.OUT)
led_yellow = Pin(5 , Pin.OUT)
led_green = Pin(9 , Pin.OUT)

while True:

    led_red.value(1)
    time.sleep(5)

    led_yellow.value(1)
    time.sleep(2)
    led_red.value(0)
    led_yellow.value(0)

    led_green.value(1)
    time.sleep(5)
    led_yellow.value(1)
    time.sleep(2)
    led_green.value(0)
    led_yellow.value(0)