from machine import Pin
import time

def faidang(led_red, led_yellow, led_green):
    led_red.value(1)
    led_yellow.value(0)
    led_green.value(0)
    time.sleep(2)

rled1 = Pin(4, Pin.OUT)
yled1 = Pin(3, Pin.OUT)
gled1 = Pin(2, Pin.OUT)

while True:
    faidang(rled1, yled1, gled1)
    rled1.value(1)
    time.sleep(1)
    yled1.value(1)
    time.sleep(1)
    gled1.value(1)
    time.sleep(1)
    time.sleep(1)