from picozero import LED, Button, Speaker
from time import sleep

red = LED(28)
amber = LED(27)
green = LED(26)
button = Button(21)
buzzer = Speaker(15)

def normal_mode():
    red.off()
    amber.off()
    green.on()

def pedestrian_crossing():
    # vàng
    green.off()
    amber.on()
    sleep(2)

    # đỏ
    amber.off()
    red.on()

    # buzzer beep nhanh
    for i in range(10):
        buzzer.on()
        sleep(0.2)
        buzzer.off()
        sleep(0.2)

    sleep(1)
    red.off()
    normal_mode()

normal_mode()

while True:
    if button.is_pressed:
        pedestrian_crossing()
        sleep(0.5)