import time
import machine
time.sleep(0.1) # Wait for USB to become ready

green_led = machine.Pin(15, machine.Pin.OUT)
yellow_led = machine.Pin(14, machine.Pin.OUT)
red_led = machine.Pin(13, machine.Pin.OUT)
button = machine.Pin(12, machine.Pin.PULL_DOWN)
green_button = machine.Pin(16, machine.Pin.PULL_DOWN)
buzzer = machine.Pin(27, machine.Pin.OUT)
green_button_pressed = False
button_pressed = False
def green_btn_handler(pin):
    global green_button_pressed
    if not green_button_pressed:
        green_button_pressed = True
def btn_handler(pin):
    global button_pressed
    if not button_pressed:
        button_pressed = True

green_button.irq(trigger=machine.Pin.IRQ_FALLING, handler=green_btn_handler)
button.irq(trigger=machine.Pin.IRQ_FALLING, handler=btn_handler)

while True:
    if button_pressed == True:
        red_led.value(1)
        for i in range(20):
            buzzer.value(1)
            print("go crossing")
            time.sleep(0.05)
            buzzer.value(0)
            time.sleep(0.2)
        button_pressed = False
    if green_button_pressed == True:
        green_led.value(1)
        red_led.value(0)
        yellow_led(0)
        print("green light activated")
    red_led.value(1)
    time.sleep(5)
    if green_button_pressed == True:
        green_led.value(1)
        red_led.value(0)
        yellow_led(0)
        print("green light activated")
    yellow_led.value(1)
    red_led.value(0)
    time.sleep(2)
    if green_button_pressed == True:
        green_led.value(1)
        red_led.value(0)
        yellow_led(0)
        print("green light activated")
    yellow_led.value(0)
    green_led.value(1)
    time.sleep(5)
    if green_button_pressed == True:
        green_led.value(1)
        red_led.value(0)
        yellow_led(0)
        print("green light activated")
    green_led.value(0)
    yellow_led.value(1)
    time.sleep(2)
    if green_button_pressed == True:
        green_led.value(1)
        red_led.value(0)
        yellow_led(0)
        print("green light activated")