from machine import Pin
from utime import sleep
import _thread

led_red = Pin(25, Pin.OUT)
led_amber = Pin(26, Pin.OUT)
led_green = Pin(27, Pin.OUT)

button = Pin(4, Pin.IN, Pin.PULL_DOWN)
buzzer = Pin(5, Pin.OUT)

button_pressed = False

def button_reader_thread():
    global button_pressed
    while True:
        if button.value() == 1:
            button_pressed = True

_thread.start_new_thread(button_reader_thread, ())

while True:
    if button_pressed == True:
        led_red.on()
        for i in range(10):
            buzzer.on()
            sleep(.2)
            buzzer.off()
            sleep(.2)
        button_pressed = False # global variable
    led_red.on()
    sleep(5)
    led_amber.on()
    sleep(2)
    led_red.off()
    led_amber.off()
    led_green.on()
    sleep(5)
    led_green.off()
    led_amber.on()
    sleep(5)
    led_amber.off()