from machine import Pin
from time import sleep

red1, yellow1, green1 = Pin(13, Pin.OUT), Pin(12, Pin.OUT), Pin(14, Pin.OUT)
red2, yellow2, green2 = Pin(25, Pin.OUT), Pin(26, Pin.OUT), Pin(27, Pin.OUT)
red3, yellow3, green3 = Pin(0, Pin.OUT), Pin(2, Pin.OUT), Pin(4, Pin.OUT)
red4, yellow4, green4 = Pin(21, Pin.OUT), Pin(22, Pin.OUT), Pin(23, Pin.OUT)

def traffic_light_sequence():


    yellow1.off()
    yellow4.off()
    yellow2.off()
    yellow3.off()

    green1.on()
    green4.on()
    red2.on()
    red3.on()
    sleep(10)

    yellow1.on()
    yellow4.on()
    yellow2.on()
    yellow3.on()
    sleep(3)

    yellow1.off()
    yellow4.off()
    yellow2.off()
    yellow3.off()

    green1.off()
    green4.off()
    red2.off()  
    red3.off()
  

    green2.on()
    green3.on()
    red1.on()
    red4.on()
    sleep(10)


    yellow1.on()
    yellow4.on()
    yellow2.on()
    yellow3.on()
    sleep(3)

    yellow1.off()
    yellow4.off()
    yellow2.off()
    yellow3.off()
    
    green2.off()
    green3.off()
    red1.off()
    red4.off()

    yellow1.on()
    yellow4.on()
    yellow2.on()
    yellow3.on()
    sleep(3)

    
    


while True:
    traffic_light_sequence()