from machine import Pin
from time import sleep
red=Pin(0,Pin.OUT)
yellow=Pin(1,Pin.OUT)
green=Pin(2,Pin.OUT)
while (1):
    
    yellow.off()
    red.on()
    sleep(5)
    red.off()
    yellow.on()
    sleep(2)
    yellow.off()
    green.on()
    sleep(5)
    green.off()
    yellow.on()
    sleep(2)