BLUETOOTH BASED OFFICE AUTOMATION AND SECURITY SYSTEM USING RASPBERRY PI AND ANDROID APPLICATION

http://www.iaeme.com/IJARET/index.asp 449 editor@iaeme.com
International Journal of Advanced Research in Engineering and Technology (IJARET)
Volume 10, Issue 2, March-April 2019, pp. 449-456. Article ID: IJARET_10_02_043
Available online at http://www.iaeme.com/IJARET/issues.asp?JType=IJARET&VType=10&IType=02
ISSN Print: 0976-6480 and ISSN Online: 0976-6499
© IAEME Publication
BLUETOOTH BASED OFFICE AUTOMATION
AND SECURITY SYSTEM USING RASPBERRY
PI AND ANDROID APPLICATION
Dr. Dhiraj Sunehra
Department of Electronics & Communication Engineering
Faculty of Engineering & Technology
Jawaharlal Nehru Technological University Hyderabad, Hyderabad
ABSTRACT
An office receptionist is an employee who provides administrative support in the
office. The position even though is of much importance, it hinders the use of man power
for a much higher productive and useful purpose in the office. This paper deals with
design and implementation of an automated office receptionist system using Raspberry
Pi and an Android application. It not only helps the official to directly interact with the
visitor but also to maintain a visitor’s record in the e-mail. This eliminates manual
assistance and also improves the security. The device can also be used at home,
corporate offices, hospitals, etc., for security purpose and administrative purposes. This
simple and cost effective prototype device is designed and when tested it effectively
performed the task of office receptionist.
Keywords: Raspberry Pi Processor, Office Automation, Bluetooth, Email, Android
application
Cite this Article: Dr. Dhiraj Sunehra, Bluetooth Based Office Automation and Security
System using Raspberry Pi and Android Application, International Journal of Advanced
Research in Engineering and Technology, 10(2), 2019, pp. 449-456.
http://www.iaeme.com/IJARET/issues.asp?JType=IJARET&VType=10&IType=2
1. INTRODUCTION
An office receptionist is an employee who provides administrative support for the smooth and
efficient working of an official. The more usual job includes taking the permission to meet the
official instead of the visitor and notify them. Obstruct the visitors when the meeting is going
on and to keep the record of visitors. This rather results to an improper use of a productive
person. An office without automation system will cause interruptions during meeting,
discussions or important calls due to visitors. Privacy of official will be disrupted by guests at
unexpected time. It will also be difficult to keep track of visitors for security reasons.
A simple device is designed with a novel approach to perform the job of a receptionist as
office automation system. This enables them to get involved in other productive activities and
to efficiently use man power. The device can also be used in house. This avoids creating
disturbances from sales personals, local fundraisers and unwanted interruptions and will be

Dr. Dhiraj Sunehra
secure. In hospitals, this device can be used for notifying the patients waiting outside doctor’s
cabin about the status of ongoing consultation and for calling the next patient to cabin (where
we usually use token system). The major advantages of this prototype are the visitor’s identity
would be revealed, message interaction over the pressing of a button is provided using
Bluetooth. The range of Bluetooth can be extended by using range extenders.
2. HARDWARE DESCRIPTION
2.1. Block Diagram
Figure 1 shows the block diagram of the automated office receptionist system. The setup
consists of Raspberry pi, Router, Bluetooth module, Serial-USB converter, LCD, USB-Camera
and Push-button switch. Wireless network consists of Raspberry Pi, Bluetooth module, Serial-
USB converter, Push-button, USB-Camera, Bluetooth controller application and LCD. The
serial data from the Bluetooth controller application is passed on to the Raspberry pi with the
help of Bluetooth module with which status is sent to LCD through wireless communication by
Bluetooth module. The Raspberry Pi uploads the status of the official through LCD and the
status of the official is controlled through the LCD.
Figure 1 Block Diagram of Automated Office Receptionist System
2.2. Raspberry Pi Model B+ Board
Raspberry Pi is a minicomputer, which is a credit card sized board. It is based on BCM2835
(BCM-Broadcom) system on chip (SoC). Its features include 512 MB of SDRAM, 40 GPIO
pins, one Ethernet port, 4 USB ports, HDMI port Audio jack. It has a 700 MHz ARM1176JZFS
application processor (Figure 2)[1]. The USB hub can be used to expand the number of ports
or to plug the mouse into your keyboard, if it has its own USB port. Ethernet connector allows
for wired network access.
A 5V Micro USB power connector is available into which we can plug a compatible power
supply. For placing the SD card, a full-sized SD card slot is available. An SD card with an
operating system (OS) installed is required for booting the device. The HDMI port provides
digital video and audio output.

Bluetooth Based Office Automation and Security System using Raspberry Pi and Android
Application
Figure 2 Raspberry Pi Model B+ Board
2.3. Salient Features of Bluetooth Module
HC‐05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for
transparent wireless serial connection setup [2]. This Bluetooth module can be used in a Master
or Slave configuration, making it a great solution for wireless communication (Figure 3). This
serial port Bluetooth module is fully qualified Bluetooth V2.0+EDR (Enhanced Data Rate) 3
Mbps modulation with complete 2.4 GHz radio transceiver and baseband. It uses CSR Bluecore
04 ‐ External single chip Bluetooth system with CMOS technology and with AFH (Adaptive
Frequency Hopping Feature).
2.3.1. Hardware Features
• Typical ‐80dBm sensitivity.
• Up to +4dBm RF transmit power.
• 3.3 to 5 V I/O.
• PIO (Programmable Input/output) control.
• UART interface with programmable baud rate.
• With integrated antenna.
• With edge connector.
2.3.2. Software Features
• Slave default Baud rate: 9600, Data bits: 8, Stop bit:1, Parity: No parity.
• Auto‐connect to the last device on power as default.
• Permit pairing device to connect as default.
• Auto‐pairing PINCODE:”1234” as default.
Figure 3 Bluetooth Module
2.4. Salient Features of Serial USB Converter
The CP2102 is a highly-integrated USB-to-UART bridge controller providing a simple solution
for updating RS-232 designs to USB using a minimum of components and PCB space (Figure

Dr. Dhiraj Sunehra
4). It includes a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM,
and asynchronous serial data bus (UART) with full modem control signals in a compact 5×5
mm MLP-28 package. No other external USB components are required.
Figure 4 Bluetooth Module - Serial to USB connection
2.5. Push Button Switch
A push-button is a simple switch mechanism for controlling some aspect of a machine or a
process (Figure 5). Buttons are typically made out of hard material, usually plastic or metal.
The surface is usually flat or shaped to accommodate the human finger or hand, so as to be
easily depressed or pushed. The “push-button” switch has been utilized in calculators, push-
button telephones, kitchen appliances, and various other mechanical and electronic devices.
Figure 5 Push Button Switch
2.6. Liquid Crystal Display
Liquid Crystal Display (LCD) screen is an electronic display module and finds a wide range of
applications. A 16×2 LCD means it can display 16 characters per line and there are 2 such lines
(Figure 6). In this LCD, each character is displayed in 5×7 pixel matrix. This LCD has two
registers, viz., command and data. The command register stores the command instructions given
to the LCD. A command is an instruction given to LCD to do a predefined task like initializing
it, clearing its screen, setting the cursor position, controlling display etc. The data register stores
the data to be displayed on the LCD [3]. The data is the ASCII value of the character to be
displayed on the LCD.
Figure 6 LCD Pin Diagram
2.7. Web Camera
A webcam is a video camera that feeds or streams its image in real time to or through a computer
to a computer network. When “captured” by the computer, the video stream may be saved,

Application
viewed or sent on to other networks via systems such as the internet, and emailed as an
attachment.
Figure 7 Web Camera
3. SOFTWARE TOOLS
ExtraPuTTY is a software tool used to access Raspberry Pi. PuTTY is an open source terminal
emulator. It can support various network protocols such as SCP, Telnet, rlogin and raw socket
connection [4].
Python language is a high level script language [5]. Python is portable and it supports on
UNIX, Linux and Windows operating system (OS) platforms. Python language fully supports
the Raspberry Pi. The written program files are saved with the extension of .py.
4. FLOWCHART
Figure 8 shows the flowchart of the sequence of events that occur in the automated office
receptionist system.
Figure 8 Flowchart of Automated Office Receptionist system

Dr. Dhiraj Sunehra
5. EXPERIMENTAL SETUP
Figure 9 shows the experimental setup of automated office receptionist system. The setup
consists of Raspberry Pi, router, Bluetooth module, Serial-USB converter, LCD, USB-Camera
and Push-button. The serial data from the Bluetooth controller application is passed on to the
Raspberry Pi with the help of Bluetooth module with which status is sent to LCD through
wireless communication by Bluetooth module. The Raspberry Pi uploads the status of the
official on the LCD.
Figure 9 Experimental Setup of the System
6. EXPERIMENTAL RESULTS
6.1. Accessing Raspberry Pi through PuTTY Software
The initialization of PuTTY software for accessing Raspberry Pi is done using IP address of the
Pi (Figure 10).
Figure 10 PuTTY Window

Application
Login to Raspberry Pi contains login id as pi and password (Figure 11). After logging in,
redirect to the folder where files are stored in Raspberry Pi and open the files by using ls
command in Linux. After finding the file, to execute it use nano command nano <file_name>.
Figure 11 Logging in to Raspberry Pi
On executing or running python file to enable the wireless office automation and security
system, the data on LCD is refreshed automatically (Figure 12). The status of the official i.e.,
whether the official is frees to meet or not is displayed on the LCD.
6.2. When Push-button is pressed
Figure 12 Running Python file to capture the image of the visitor
When the push button is pressed, the USB-Camera captures the image of the visitor and it
is sent to the official via E-mail (Figure 13). It also acts as a security from preventing the
invaders entering the office premises.
Figure 13 Captured image of the visitor which is sent to the official’s email address
6.2.1. Case 1: Official is free
The official gives serial input ‘I’ through the application if he is free (Figure 14). The LCD then
displays as “Official is free” (Figure 15).
Figure 14 Serial input ‘I’ is given through application by the official if he is free

Dr. Dhiraj Sunehra
Figure 15 Status “Official is free” is displayed on LCD
6.2.2. Case 2: Official is busy
The official gives serial input ‘B’ through the application if he is busy (Figure 16). The LCD
then displays as “Official is busy” (Figure 17).
Figure 16 Serial input ‘B’ is given through application by the official if he is busy
Figure 17 Status “Official is busy” is displayed on LCD
7. CONCLUSIONS
A simple and cost effective prototype has been designed and implemented which performs the
task of an Office receptionist. It allows the official to directly interact with the visitor and helps
in maintaining an Image-time record in E-mail for security purpose. This can also be used in
for residential applications, corporate offices, hospitals, etc. The results have shown that one
can easily operate the device effectively. The work can be extended by modifying the system
to automatically respond to the visitor by integrating an ultrasonic distance sensor. Also a web
server can be included, so that the official can interact with the visitor from anywhere in the
world.
REFERENCES
[1] https://www.raspberrypi.org/
[2] https://www.mynics.in/product/bluetooth-module-hc-05/
[3] https://circuitdigest.com
[4] https://en.wikipedia.org/wiki/PuTTY.
[5] Richard L. Halterman, “Learning to Program with Python”, 2011 (www.cs.uky.edu/).

BLUETOOTH BASED OFFICE AUTOMATION AND SECURITY SYSTEM USING RASPBERRY PI AND ANDROID APPLICATION

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