Raspberry Pi Telegram Keypad Password

Now update your keypad password using Telegram Bot!

Introduction

Password is a security number or phrases that need frequently updated. Continue from the previous tutorial Interface 4×4 Keypad With Raspberry Pi, this time I add extra features, one of them is you can update your password through Telegram Bot.

Video

This video will show you about Raspberry Pi Telegram Keypad Password project.

Hardware Preparation

This is the list of items

Wiring connection table for additional relay module.

Raspberry Pi (Maker pHAT)Relay Module
5VDC+
GNDDC-
MOSIIN

Sample Program

This is the sample program for Raspberry Pi Telegram Keypad Password. Please refer to the previous tutorial for LCD library setup.

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()

# -*- coding: utf-8 -*-
# i2c bus (0 — original Pi, 1 — Rev 2 Pi)
I2CBUS = 1
# LCD Address
ADDRESS = 0x27
import smbus
from time import sleep
class i2c_device:
def __init__(self, addr, port=I2CBUS):
self.addr = addr
self.bus = smbus.SMBus(port)
# Write a single command
def write_cmd(self, cmd):
self.bus.write_byte(self.addr, cmd)
sleep(0.0001)
# Write a command and argument
def write_cmd_arg(self, cmd, data):
self.bus.write_byte_data(self.addr, cmd, data)
sleep(0.0001)
# Write a block of data
def write_block_data(self, cmd, data):
self.bus.write_block_data(self.addr, cmd, data)
sleep(0.0001)
# Read a single byte
def read(self):
return self.bus.read_byte(self.addr)
# Read
def read_data(self, cmd):
return self.bus.read_byte_data(self.addr, cmd)
# Read a block of data
def read_block_data(self, cmd):
return self.bus.read_block_data(self.addr, cmd)
# commands
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80
# flags for display entry mode
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00
# flags for display on/off control
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00
# flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
LCD_MOVERIGHT = 0x04
LCD_MOVELEFT = 0x00
# flags for function set
LCD_8BITMODE = 0x10
LCD_4BITMODE = 0x00
LCD_2LINE = 0x08
LCD_1LINE = 0x00
LCD_5x10DOTS = 0x04
LCD_5x8DOTS = 0x00
# flags for backlight control
LCD_BACKLIGHT = 0x08
LCD_NOBACKLIGHT = 0x00
En = 0b00000100 # Enable bit
Rw = 0b00000010 # Read/Write bit
Rs = 0b00000001 # Register select bit
class lcd:
#initializes objects and lcd
def __init__(self):
self.lcd_device = i2c_device(ADDRESS)
self.lcd_write(0x03)
self.lcd_write(0x03)
self.lcd_write(0x03)
self.lcd_write(0x02)
self.lcd_write(LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE)
self.lcd_write(LCD_DISPLAYCONTROL | LCD_DISPLAYON)
self.lcd_write(LCD_CLEARDISPLAY)
self.lcd_write(LCD_ENTRYMODESET | LCD_ENTRYLEFT)
sleep(0.2)
# clocks EN to latch command
def lcd_strobe(self, data):
self.lcd_device.write_cmd(data | En | LCD_BACKLIGHT)
sleep(.0005)
self.lcd_device.write_cmd(((data & ~En) | LCD_BACKLIGHT))
sleep(.0001)
def lcd_write_four_bits(self, data):
self.lcd_device.write_cmd(data | LCD_BACKLIGHT)
self.lcd_strobe(data)
# write a command to lcd
def lcd_write(self, cmd, mode=0):
self.lcd_write_four_bits(mode | (cmd & 0xF0))
self.lcd_write_four_bits(mode | ((cmd << 4) & 0xF0))
# write a character to lcd (or character rom) 0x09: backlight | RS=DR<
# works!
def lcd_write_char(self, charvalue, mode=1):
self.lcd_write_four_bits(mode | (charvalue & 0xF0))
self.lcd_write_four_bits(mode | ((charvalue << 4) & 0xF0))
# put string function with optional char positioning
def lcd_display_string(self, string, line=1, pos=0):
if line == 1:
pos_new = pos
elif line == 2:
pos_new = 0x40 + pos
elif line == 3:
pos_new = 0x14 + pos
elif line == 4:
pos_new = 0x54 + pos
self.lcd_write(0x80 + pos_new)
for char in string:
self.lcd_write(ord(char), Rs)
# clear lcd and set to home
def lcd_clear(self):
self.lcd_write(LCD_CLEARDISPLAY)
self.lcd_write(LCD_RETURNHOME)
# define backlight on/off (lcd.backlight(1); off= lcd.backlight(0)
def backlight(self, state): # for state, 1 = on, 0 = off
if state == 1:
self.lcd_device.write_cmd(LCD_BACKLIGHT)
elif state == 0:
self.lcd_device.write_cmd(LCD_NOBACKLIGHT)
# add custom characters (0 – 7)
def lcd_load_custom_chars(self, fontdata):
self.lcd_write(0x40);
for char in fontdata:
for line in char:
self.lcd_write_char(line)

view raw
I2C_LCD_driver.py
hosted with ❤ by GitHub

Thank You

References:

  1. How to Display on I2C LCD Using Raspberry Pi
  2. Interface 4×4 Keypad With Raspberry Pi
  3. Displaying Telegram Message on Dot Matrix Using Raspberry Pi

Thanks for reading this tutorial. If you have any technical inquiry, please post at Cytron Technical Forum.

1 thought on “Raspberry Pi Telegram Keypad Password”

  1. Hello Idris, cool project over there.
    Do you think is it possible to replace the raspberry PI with PIC 16F877 and adapt the software codes accordingly?

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