Here I post some raw python code that implements an acoustic system booking for people passing through the street.
from gpiozero import Button,LED,Buzzer
from time import sleep
red = LED(25)
yellow = LED(8)
green = LED(7)
button = Button(2)
buzzer = Buzzer(15)
booking = False
def activate_booking():
global booking
booking = True
button.when_pressed = activate_booking
while True:
green.on()
sleep(5)
yellow.on()
sleep(1)
yellow.off()
green.off()
if not booking:
red.on()
sleep(10)
red.off()
else:
red.on()
for i in range(5):
buzzer.on()
sleep(1)
buzzer.off()
sleep(1)
red.off()
booking = False