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Raspberry Pi keypad password application with Telegram Bot.
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()
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