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) 

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

    led_yellow.value(0)
    led_green.value(1)
    time.sleep(3)  

# phak suan khong khar drk fai led
rled1 = Pin(2, Pin.OUT)
yled1 = Pin(1, Pin.OUT)
gled1 = Pin(28, Pin.OUT)

rled2 = Pin(4, Pin.OUT)
yled2 = Pin(3, Pin.OUT)
gled2 = Pin(5, Pin.OUT)

rled3 = Pin(9, Pin.OUT)
yled3 = Pin(8, Pin.OUT)
gled3 = Pin(7, Pin.OUT)

rled4 = Pin(27, Pin.OUT)
yled4 = Pin(26, Pin.OUT)
gled4 = Pin(22, Pin.OUT)

# phak suan loob
while True:
   faidang(gled1,yled1,rled1)
   faidang(gled2,yled2,rled2)
   faidang(gled3,yled3,rled3)
   faidang(gled4,yled4,rled4)