BIOMETRIC SMART CARD POLLING

SYSTEM - A Project Report

Guided By , Ms.K.Vadivukkarasi Assistant Professor (O.G) RTOS and CAN

Prepared By ,

AMS.SYED ADBUL CADER(Reg.No:10406203)

N.SIVAKUMAR (Reg.No:10406199)

M.VAZHVANDI (Reg.No:10406205)

Introduction: Now-a-days, the technologies in electronics has brought modernization and as intervention to

face human difficulty. Especially when considering the currently used voting system has flaws in system by

means of Security, Casting Vote anywhere, and also manpower involved in counting the votes. This

motivated as to design Voting System which incorporates technologies like Biometric and RFID Reader to

get a interface with user.

Abstract:

The main objective of our project is to render user interface system with easy way of voting system and also in

addition to that it provides safe and secured system thus by preventing unauthorized person to cast the vote. The project

involves finger print sensor to authenticate user , RFID card to identify user and display information to user using LCD

display. The information about user casting the vote is stored in EEPROM and also to retrieve the data for processing

the votes. The entire process of communication between the each devices is done by microcontroller which does

manipulation data which is fed into it. The main theme of this project is to use existing ATM as voting machines with

secured voting system.

Each ATM machine will additionally be fitted with a finger print sensor and RFID reader. During the voting

period the user has to place RFID card near the reader, the micro controller will identify and display the information

about the user using LCD , and ask him to authenticate the user by placing his finger in the finger print sensor. A list will

be displayed in the LCD, indicating the number of candidates contesting in the poll. The user has to cast his vote by

pressing corresponding number of a candidate. After the voting the LCD will display the successful casting of vote.

When ever the user try to cast the second time, the LCD will display a warning message informing that the vote is

already casted.

BASIC BLOCK DIAGRAM: RFID – RADIO FREQUENCY:

RFID tags, along with sensors and microprocessors are transforming everyday objects into

those that are smart and interactive. When you add the Internet into the mix, what you get is Silent

Commerce, with objects communicating directly and monetary transactions taking place. RFID tags allow

you to scan and keep track of items from the factory to the consumer; identify merchandise authenticity;

traces items of inventory; helps to prevent theft and piracy; and act to monitor product environmental

conditions

89s52

BIOMETRIC FINGER

PRINT SENSOR

ALARM INDICATION

LCD DISPLAY

EEPROM

RFID READER

KEYPAD

POWER SUPPLY

RFID Consisted of:

Magnetic Coil RF Receiver Serial output

Card Consisted of:

RF Antenna Chip RF Transmiter

CIRCUIT DIAGRAM:

RFID Module and Principle of working:

RFID Reader Module, are also called as interrogators. They convert radio waves returned from

the RFID tag into a form that can be passed on to Controllers, which can make use of it. RFID tags and

readers have to be tuned to the same frequency in order to communicate. RFID systems use many different

frequencies, but the most common and widely used & supported by our Reader is 125kHz frequency range.

An RFID system consists of two separate components: a tag and a reader. Tags are analogous to

barcode labels, and come in different shapes and sizes. The tag contains an antenna connected to a small

microchip containing up to two kilobytes of data. The reader, or scanner, functions similarly to a barcode

scanner; however, while a barcode scanner uses a laser beam to scan the barcode, an RFID scanner uses

electromagnetic waves. To transmit these waves, the scanner uses an antenna that transmits a signal,

communicating with the tags antenna. The tags antenna receives data from the scanner and transmits its

particular chip information to the .The data on the chip is usually stored in one of two types of memory. The

most common is Read-Only Memory (ROM); as its name suggests, read-only memory cannot be altered

once programmed onto the chip during the manufacturing process. The second type of memory is

Read/Write Memory; though it is also programmed during the manufacturing process, it can later be altered

by certain devices.

The RFID tag consists of a powered or non powered microchip and an antenna. The three different

types of tag. Passive tags are the simplest, smallest and cheapest version of an RFID tag as they do not

contain a built-in power source and consequently cannot initiate communication with a reader. As the

available power from the reader field diminishes rapidly with distance, passive tags have practical read

ranges that vary up to 10 mm to above 5 mm. Semi-passive tags have built-in batteries and do not require

energy from the reader field to power the microchip. This allows them to function with much lower signal

power levels and act over greater distances.

FLOW CHART:

Serial communication It is the process of transmitting data bits one by one serially, i.e. only one line is used for serial

communication. For e.g. 8051 is a 8 bit MC, if 8 bits of data is transmitted at a time in 8 line it is called

parallel communication. If the 8 bits are transmitted one bit at time in one line it is called serial

communication. UART is a device used for converting parallel to serial and vice versa.

8051 MC has two lines for performing serial communication. TXD pin for transmitting data and

RXD pin for receiving data. Serial communication can be used to communicate with computer, GSM

MODEM, GPS etc. Serial communication is performed for long distance communication with cheap cost.

8051 MC operates on TTL logic that is 0 to 5v; so in order to communicate with other serial devices

it should also be compatible in voltage that is 0 to 5v. A GSM modem & GPS are TTL compatible devices so

they can be directly interfaced with 8051 MC. Serial communications with computer cannot be directly

performed since a computer operates on different voltage logic called RS232 (RS- Recommended Standard).

It has operating voltage of -3 to –25 to logic 1 and +3 to +25 for logic 0 and the port used for communication

is called serial port. If we connect a 8051 directly to the serial port it may damage our MC so in order for

making voltage compatibility we are using a voltage converter IC called MAX232. It converts RS232 logic

to TTL logic and vice versa. It operates on +5v.

In order to obtain high voltage for RS 232 logic, voltage doublers circuits are used. The capacitors

are used for voltage doubling.

In order to transmit data to PC, RXD pin of MC is connected to pin number 10 or 11 of max 232

IC, the output pin 7 or 14 is connected RX, pin2 of the serial port and vice versa for transmitting. The

connector used for connecting serial data bus to the computer is called „DB9‟ connector (DB- data Bus). We

are using a connection called null modem connection in which only three pins are used such as RXD [Pin2],

TXD [pin3] & GND [pin5].

LCD- LIQUID CRYSTAL DISPLAY:

LCD stands for liquid crystal display, it is a output device used for displaying alphanumeric

characters. It is a 16-pin device, which is, separated in to 8 data lines, 3 control lines, 2 power supply lines, 2

lines for back light and last line for contrast adjusting. LCD as a in built memory which is used to store data

which as to be displayed which can also be read back. The LCD is differentiated based on lines present, for

e.g. 1X16, 2X16, 4X16 etc. The 1X16 means that the LCD as 1 line with 16 characters can be displayed and

similarly for other displays.

A LCD has two registers named command register and data register. The data register is used to

display data in LCD, for e.g. to display data “one” in LCD the data‟s should be written in the data register.

There are different types of commands like „clear screen, cursor blink, start data from first line, start data

from second line (each command is represented by its own hex code) etc., which should be written in the

command register. In order to display the data “one”, it‟s corresponding ASCII values should be written in

the data register.

Control lines:

VCC & led+

8 data lines

Preset

Contrast

3 control lines pin

LCD

8051

Pin Description: PIN Symbol Level I/O function Function(4-bit mode) Function(8-bit mode)

1 Vss - - Powersuppiy(gnd) Powersuppiy(gnd)

2 VCC - - Powersuppiy(+5V) Powersuppiy(+5V)

3 vee - - Contract adjust Contract adjust

4 Rs 0/1 I 0=instruction 1 = data 0=instruction 1 = data

5 R/W 0/1 I 0 = Write to 1=Read from

LCD

0 = Write to 1=Read from

LCD

6 E 1 - 0 I Enable signal Enable signal

7 D0 0/1 I/O not used Data bus line 0 (LSB)

8 D2 0/1 I/O not used Data bus line 1

9 D3 0/1 I/O not used Data bus line 2

10 D4 0/1 I/O not used Data bus line 3

11 D5 0/1 I/O Data bus line 0 (LSB) and 4 Data bus line 4

12 D6 0/1 I/O Data bus line 1 and 5 Data bus line 5

13 D7 0/1 I/O Data bus line 2 and 6 Data bus line 6

14 D8 0/1 I/O Data bus line 3 and 7 (MSB) Data bus line 7

A LCD has only one data bus for both data and command. So in order to differentiate between data

and register a control line called RS (register select) is used. If RS is given the value „1‟ the data is given to

the LCD, else if RS is given „0‟ the command is given to the LCD.

R/W (read/write) is a control line, which is used to inform LCD that a data is written to or read from

LCD. For example if R/W is given the value „1‟ it means that the data is read from LCD and if R/W is „0‟

then the data is written to the LCD. E(enable) is a control line, which is used to inform LCD that a data or

command is present in the data bus of LCD.

CONCLUSION: ATM is the most exciting development in communications ever. Its development is a risk that

offers big rewards; ATM has the potential to be the technology that provides huge bandwidths at low

cost if the hurdles can be overcome.