import time
from machine import Pin


green_south = Pin(27, Pin.OUT)
yellow_south = Pin(26, Pin.OUT)
red_south = Pin(25, Pin.OUT)

green_north = Pin(13, Pin.OUT)
yellow_north = Pin(12, Pin.OUT)
red_north = Pin(14, Pin.OUT)

green_west = Pin(21, Pin.OUT)
yellow_west = Pin(22, Pin.OUT)
red_west = Pin(23, Pin.OUT)

green_east = Pin(18, Pin.OUT)
yellow_east = Pin(17, Pin.OUT)
red_east = Pin(16, Pin.OUT)

while True:
    green_south.on()
    green_north.on()
    red_west.on()
    red_east.on()
    time.sleep(2)
    red_west.off()
    red_east.off()
    green_south.off()
    green_north.off()
    yellow_south.on()
    yellow_north.on()
    yellow_west.on()
    yellow_east.on()
    time.sleep(2)
    yellow_south.off()
    yellow_north.off()
    yellow_west.off()
    yellow_east.off()
    green_east.on()
    green_west.on()
    red_south.on()
    red_north.on()
    time.sleep(2)
    green_east.off()
    green_west.off()
    red_south.off()
    red_north.off()
    yellow_south.on()
    yellow_north.on()
    yellow_west.on()
    yellow_east.on()
    time.sleep(2)
    yellow_south.off()
    yellow_north.off()
    yellow_west.off()
    yellow_east.off()