from machine import Pin
from time import sleep

rled = Pin(21, Pin.OUT)
yled = Pin(18, Pin.OUT)
gled = Pin(17, Pin.OUT)

def cycle():
    rled.value(1)
    sleep(1)
    yled.value(1)
    rled.value(0)
    sleep(1)
    gled.value(1)
    yled.value(0)
    sleep(1)

    rled.value(0)
    gled.value(0)
    yled.value(0)


def cross_road(button):
    state = button.value()
    rled.value(0)
    if state == 1:
        rled.value(1)
        gled.value(0)
        for i in range(10):
            print(f"Timer : {10-i}")
            sleep(1)
    elif state == 0:
        cycle()
    sleep(1)


pbutton = Pin(13, Pin.IN)

while True:
    cross_road(pbutton)