BY

A.MANIKANTA(11621A0401)

B.PRABHU KIRAN(11621A0407)

OUTLINE

Introduction

Components list

Block diagram

Description

Microcontroller 8051

Principle of operation

Advantages and Disadvantages

Conclusion

INTRODUCTION

Traditionally, a voting machine has been defined by the

mechanism the system uses to cast votes and categorized by the

location where the system tabulates the votes. With

advancement in technology EVM came into picture.

It ensures flawless voting and thus has become more

widespread.Retains all the characteristics of voting while

making it more expedient.

Certain systems may be more or less accessible to all voters, or

not accessible to those voters with certain of disabilities. They

can also have an effect on the public's ability to oversee

elections types.

COMPONENTS LIST

Micro controller 8051(AT89C51)

LED

LCD(16*2Alphanumaric)

Power supply

Control switches

Contd….

Buzzer

Connecting wires

PCB or bread board

CIRCUIT DIAGRAM

BLOCK DIAGRAM

DESCRIPTION

The electronic voting machine consists of four blocks

Microcontroller

Control switches

LCD display

Input keys

MICROCONTROLLER 8051

Microcontroller 8051 is designed in 1980’s by Intel.

It is a computer on chip type.

It is 40 pin dip type ic.

It is designed for performing special type operation to do

specific jobs.

Contd…….

It has four sets of i/o pins which can be used both input and

output operations.

It contains four ports.

Each port contains 8 pins.

The pin configuration is shown below

PIN DIAGRAM OF 8051

Contd…..

Pins 1-8:it is said to be port 1 and it is used for input/output

operations.

Pin 9 is a reset pin.

Pins 10-17: it is port 3 is also used for input/output operations

but specially it has alternate operations

1. Pin 10(RXD): - Serial asynchronous communication input or

Serial synchronous communication output.

Contd…..

1. Pin 11(TXD): Serial asynchronous communication output or

Serial synchronous communication clock output.

2. Pin 12(INT 0):Interrupt 0 input.

3. Pin 13(INT 1);Interrupt 1 input.

4. Pin 14(T0):Counter 0 clock input.

5. Pin 15(T1):Counter 1 clock input.

6. Pin 16(WR): Write to external (additional) RAM.

7. Pin 17(RD):Read from external RAM.

Pin 18 to 19(X1,X2):Internal oscillator.

Contd….

Pin 20(GND):Ground

Pin 21-28(port 2): I/P or O/P port when no external memory is

used. In case external memory is used, the higher address byte.

Pin 29 (PSEN): Program Store Enable. If external ROM is used

for storing program then a logic zero (0) appears on it every

time the microcontroller reads a byte from memory

Pin 30 (ALE): Address Latch Enable

Contd…

Pin 31 (EA): Enable Access. To use program from an ext.

memory(Logic zero), to use program from both int. as well as

ext. memory (logic 1).

Pin 32-39 (port 0): -I/P or O/P when ALE is low and lower

order address byte when ALE is high.

Pin 40(Vcc): +5v power supply.

LCD 2*16

The Serial LCDs are very functional, liquid crystal displays

that can be easily interfaced to and controlled by a

microcontroller using an I/O pin.

This device can be connected to a PC serial port using a

MAX232 line driver. The circuit isn't supported by us.

The LCD displays provide basic text wrapping so that your text

looks correct on the display.

Full control over all of their advanced LCD features allows you

to move the cursor anywhere on the display with a single

instruction and turn the display on and off in any configuration

LCD

16*2

display

PRINCIPLE OF OPERATION Power on: When supply is turned on WHITE LED glows.

VOTING MODE

-toggle switch on VCC

When toggle switch is in voting mode“Voting mode” is displayed followed by“Please vote”. After a vote being given,“Please wait for authority switch” isdisplayed and again enable for votingafter Control switch being pressed bythe voting Authority.

COUNTING MODE

-toggle switch on GND.

Counting Mode: When toggle switch is incounting mode “Counting mode” indisplayed on the screen, and total numberof votes to respective candidate can bedisplayed on the screen

Contd….

Clear mode: Press clear switch when all entries are required to

be erased. Clear switch should be pressed before voting

procedure.

Buzzer indication: Pressing of key in voting mode is indicated

by a buzzer sound.

Controller switch: This switch is provided for enabling the

keypad in voting mode.

This Switch is under the control of voting authority.

ADAVANTAGES

It is economical.

Less manpower required.

Time conscious, as less time required for voting & counting.

Avoids invalid voting.

Saves transportation cost due to its compact size.

Convenient on the part of voter.

DISADVANTAGES

Security issues and unequal internet access.

We have to use external chip to store the votes.

We have provide continuous power supply,

Conclusion

This approach allows for the easy development and

deployment of applications. For quite some time, voting

equipment vendors have maintained that their systems are

secure, and that the closed-source nature makes them even

more secure.

In fact, we believe that an open process would result in more

careful development, as more scientists, software engineers,

political activists, and others who value their democracy would

be paying attention to the quality of the software that is used

for their elections.

REFRENCES

www.ieee.com

The 8051 Microcontroller and Embedded Systems by Mazidi

www.microcontrollerprojects00.blogspot.in

THANKING YOU