Raspberry Pi keypad password application with Telegram Bot.

RPiTelegramKeypadPassword.py

from gpiozero import DigitalInputDevice, DigitalOutputDevice, Buzzer
from time import time, sleep
import telepot
import I2C_LCD_driver

col1 = DigitalOutputDevice(17)
col2 = DigitalOutputDevice(18)
col3 = DigitalOutputDevice(27)
col4 = DigitalOutputDevice(22)
row1 = DigitalInputDevice(25, pull_up=None, active_state=True)
row2 = DigitalInputDevice(12, pull_up=None, active_state=True)
row3 = DigitalInputDevice(13, pull_up=None, active_state=True)
row4 = DigitalInputDevice(19, pull_up=None, active_state=True)
buzzer = Buzzer(26)
relay = DigitalOutputDevice(10)

lcd = I2C_LCD_driver.lcd()

def handle(msg):
  global telegramText
  global chat_id
  global telegramMessage
  
  chat_id = msg['chat']['id']
  telegramText = msg['text']
  
  print('Message received from ' + str(chat_id))
  
  if telegramText == '/start':
    bot.sendMessage(chat_id, 'Welcome to Idris Bot')
  
  else:
    buzzer.beep(0.1, 0.1, 2)
    telegramMessage = True

def scanCol(colNumber):
    if colNumber == 0:
        col1.on()
        col2.off()
        col3.off()
        col4.off()
    elif colNumber == 1:
        col1.off()
        col2.on()
        col3.off()
        col4.off()
    elif colNumber == 2:
        col1.off()
        col2.off()
        col3.on()
        col4.off()
    elif colNumber == 3:
        col1.off()
        col2.off()
        col3.off()
        col4.on()

def row1Pressed():
    global colNumber
    global keypadNumber
    global scanning
    if col1.value == 1:
        keypadNumber = 1
    elif col2.value == 1:
        keypadNumber = 2
    elif col3.value == 1:
        keypadNumber = 3
    elif col4.value == 1:
        keypadNumber = 10
    scanning = False

def row2Pressed():
    global colNumber
    global keypadNumber
    global scanning
    if col1.value == 1:
        keypadNumber = 4
    elif col2.value == 1:
        keypadNumber = 5
    elif col3.value == 1:
        keypadNumber = 6
    elif col4.value == 1:
        keypadNumber = 11
    scanning = False

def row3Pressed():
    global colNumber
    global keypadNumber
    global scanning
    if col1.value == 1:
        keypadNumber = 7
    elif col2.value == 1:
        keypadNumber = 8
    elif col3.value == 1:
        keypadNumber = 9
    elif col4.value == 1:
        keypadNumber = 12
    scanning = False
        
def row4Pressed():
    global colNumber
    global keypadNumber
    global scanning
    if col1.value == 1:
        keypadNumber = 14
    elif col2.value == 1:
        keypadNumber = 0
    elif col3.value == 1:
        keypadNumber = 15
    elif col4.value == 1:
        keypadNumber = 13
    scanning = False

def row1Released():
    global scanning
    scanning = True

def row2Released():
    global scanning
    scanning = True

def row3Released():
    global scanning
    scanning = True

def row4Released():
    global scanning
    scanning = True

bot = telepot.Bot('697323517:AAG5U8PPsOup5B430rfVSvgE8j1lZWpb-QY')
bot.message_loop(handle)

row1.when_activated = row1Pressed
row2.when_activated = row2Pressed
row3.when_activated = row3Pressed
row4.when_activated = row4Pressed
row1.when_deactivated = row1Released
row2.when_deactivated = row2Released
row3.when_deactivated = row3Released
row4.when_deactivated = row4Released

currentMillis = 0
previousMillis = 0
interval = 10
colNumber = 0
keypadNumber = 20
scanning = True
passCount = 0
passTimeout = 0
password = "123456"
newPassword = ""
passEnter = ""
telegramMessage = False

lcd.lcd_display_string("Telegram Bot", 1, 0)
lcd.lcd_display_string("Ready!", 2, 0)
buzzer.beep(0.1, 0.1, 1)

sleep(2)

lcd.lcd_clear()
lcd.lcd_display_string("Please enter", 1, 0)
lcd.lcd_display_string("Password:", 2, 0)

try:
    while True:
        if telegramMessage == True:
            telegramMessage = False

            if (telegramText[0:5] == "PASS "):
                newPassword = telegramText.split(" ")[1]
                if newPassword.isdigit() and len(newPassword) < 7:
                    password = newPassword
                    lcd.lcd_clear()
                    lcd.lcd_display_string("New Password", 1, 0)
                    lcd.lcd_display_string("Updated!", 2, 0)
                    bot.sendMessage(chat_id, "New password {} updated!".format(password))
                    sleep(2)
                    lcd.lcd_clear()
                    lcd.lcd_display_string("Please enter", 1, 0)
                    lcd.lcd_display_string("Password:", 2, 0)
                else:
                    bot.sendMessage(chat_id, "New password is invalid.".format(password))
            else:
                bot.sendMessage(chat_id, "Command is invalid")
        
        currentMillis = time() * 1000
        if currentMillis - previousMillis > interval and scanning == True:
            previousMillis = currentMillis
            
            scanCol(colNumber)
            
            colNumber = colNumber+1
            if colNumber == 4:
                colNumber = 0
            
            if passCount:
                passTimeout = passTimeout+1
                if passTimeout > 200:
                    if passEnter == password:
                        lcd.lcd_display_string("CORRECT!        ", 1, 0)
                        lcd.lcd_display_string("Relay ON        ", 2, 0)
                        buzzer.beep(0.05, 0.05, 2)
                        relay.on()
                        sleep(3)
                        relay.off()
                        lcd.lcd_display_string("Please enter    ", 1, 0)
                        lcd.lcd_display_string("Password:       ", 2, 0)
                        
                    else:
                        lcd.lcd_display_string("WRONG! Try again", 1, 0)
                        buzzer.beep(0.2, 0.2, 3)
                    passEnter = ""
                    passCount = 0
                    lcd.lcd_display_string("       ", 2, 9)
                    
            if passCount == 1 and passTimeout == 1:
                lcd.lcd_display_string("Scanning...     ", 1, 0)
        
        if keypadNumber < 20:
            print(keypadNumber)
            if keypadNumber < 10 and passCount < 6:
                passEnter = passEnter + str(keypadNumber)
                passStar = ""
                for x in range(passCount+1):
                    passStar = passStar + "*"
                lcd.lcd_display_string(passStar, 2, 9)
                buzzer.beep(0.05, 0.05, 1)
                passCount = passCount+1
                passTimeout = 0
            keypadNumber = 20

except KeyboardInterrupt:
    lcd.lcd_clear()