#The traffic light automatically switches on the Red, yellow and green light. 
#When the red light is ON, the buzzer informs the pedisterian to cross the road 
#till the Red light is on

import machine
import utime
import _thread
import time


from machine import Pin
from time import sleep


led_red = machine.Pin(15, machine.Pin.OUT)
led_yellow = machine.Pin(14, machine.Pin.OUT)
led_green = machine.Pin(13, machine.Pin.OUT)
button = Pin(16, machine.Pin.IN)
buzzer = machine.Pin(12, machine.Pin.OUT)
global button_pressed
button_pressed = False

while True:
    logic_state = button.value()
    if logic_state == True:     # if push_button pressed
        led_red.value(1)
        buzzer.value(1)
        utime.sleep(10)
        led_red.value(0)
        buzzer.value(0)

        led_yellow.value(1)
        utime.sleep(2)
        led_yellow.value(0)

        led_green.value(1)
        utime.sleep(5)
        led_green.value(0)

        led_yellow.value(1)
        utime.sleep(2)
        led_yellow.value(0)

    else:
        led_red.value(0)
        led_yellow.value(0)
        led_green.value(0)