Traffic Light Emulator using Pico + I2C LCD + LED

import machine
import utime
from machine import I2C, Pin
from time import sleep
from pico_i2c_lcd import I2cLcd

#Khai bao thiet bi

i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)
I2C_ADDR = i2c.scan()[0]
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)
led_yellow = machine.Pin(13, machine.Pin.OUT)
led_red = machine.Pin(14, machine.Pin.OUT)
led_green = machine.Pin(15, machine.Pin.OUT)
#So giay
red = 29
yellow = 3
green = 16
while True:
    #Den Do
    led_red.value(1)
    for i in range(red):
        lcd.putstr(str(red-i))
        sleep(1)
        lcd.clear()
    led_red.value(0)
    #Den Xanh
    led_green.value(1)
    for i in range(green):
        lcd.putstr(str(green-i))
        sleep(1)
        lcd.clear()
    led_green.value(0)
    #Den Vang
    led_yellow.value(1)
    for i in range(yellow):
        lcd.putstr(str(yellow-i))
        sleep(1)
        lcd.clear()
    led_yellow.value(0)