Published June 9, 2020 © GPL3+

Electronic Voting machine with security feature

It is a simple Electronic Voting Machine with a keypad based security system to enter the voting machine

IntermediateFull instructions provided10 hours1,396

Electronic Voting machine with security feature

Things used in this project

Hardware components

Arduino UNO

Resistor 220 ohm

Resistor 10k ohm

Single Turn Potentiometer- 10k ohms

Adafruit RGB Backlight LCD - 16x2

SparkFun Pushbutton switch 12mm

Jumper wires (generic)

SG90 Micro-servo motor

Buzzer

Gatronic Technologies 4x4 keypad

Software apps and online services

Arduino IDE

Adafruit proteus

Story

This is a simple Electronic voting machine(EVM) with an additional security feature which is a keypad lock interfaced to a servo motor which opens when the correct password is entered and closes when '#' key is pressed. It also produces a beeping sound when the wrong password is entered.The servo motor opens the casing in which electronic voting machine is placed.The objective is that only the authorized personnel are allowed to access the voting machine.

-->So the first part is completion of security part of the EVM machine

The Hardware circuit diagram of the first part is:

Here we can see the arduino is connected to 16*2 LCD display, 4*4 keypad, 5v buzzer and a servo motor. The Lcd display is to display the messages like 'Enter the 6-digit password', 'Wrong password', 'Door open' and 'Door close'.

The working goes like this:

1)if the correct password is entered which is 'AB*123' the door opens and the message is displayed.

2)If the wrong password is entered the Buzzer beeps and 'Wrong password' is displayed.

3)If the '#' key is pressed when the door is open the door will close and 'Door closed' message will be displayed.

The video of the above steps is as follows:

The final output of the first part is:

-->The second part is implementation of EVM.

The hardware diagram is:

The arduino is connected to lcd display and the 5 push button switches.The lcd display is meant to display the messages.

The working goes like this:

1)The first three push buttons are for casting votes for BJP, AAP and CONG parties respectively.

2)The fourth push button is a reset button which takes you back to the voting pages where you can cast your vote again.

3)The last button is the result button which gives the result of the voting process.

The code is pretty much self-explanatory.

The video for the above steps is as follows:

The final output of the second part is:

Code

#include <Keypad.h>
#include <LiquidCrystal.h>
#include <Servo.h>

Servo myservo;

LiquidCrystal lcd(A0, A1, A2, A3, A4, A5);

const int buzzer=8;

#define Password_Length 7 // Give enough room for six chars + NULL char

int pos = 0;    // variable to store the servo position

char Data[Password_Length]; // 6 is the number of chars it can hold + the null char = 7
char Master[Password_Length] = "AB*123";
byte data_count = 0;
char customKey;

const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
bool door = true;

byte rowPins[ROWS] = {0,1,2,3}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {4,5,6,7}; //connect to the column pinouts of the keypad

Keypad customKeypad(makeKeymap(keys),rowPins,colPins,ROWS,COLS); //initialize an instance of class NewKeypad

void setup()
{
  pinMode(buzzer,OUTPUT);
  myservo.attach(9);
  ServoClose();
  lcd.begin(16, 2);
  lcd.print("Hello, You!");
  delay(2000);
  lcd.clear();
}

void loop()
{
  if (door == 0)
  {
    customKey = customKeypad.getKey();
    if (customKey=='#')
    {
      lcd.clear();
      ServoClose();
      lcd.setCursor(0,0);
      lcd.print("  Door is close");
      delay(3000);
      door = 1;
    }
  }

  else Open();
}

void clearData()
{
  while (data_count != 0)
  { // This can be used for any array size,
    Data[data_count--] = 0; //clear array for new data
  }
  return;
}

void ServoOpen()
{
  for (pos = 180; pos >= 0; pos -= 5) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
}

void ServoClose()
{
  for (pos = 0; pos <= 180; pos += 5) { // goes from 180 degrees to 0 degrees
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
}

void Open()
{
  lcd.setCursor(0,0);
  lcd.print(" Enter 6 di Passwd");
  
  customKey = customKeypad.getKey();
  if (customKey) // makes sure a key is actually pressed, equal to (customKey != NO_KEY)
  {
    Data[data_count] = customKey; 
    lcd.setCursor(data_count,1); 
    lcd.print("*"); 
    data_count++;
  }

  if (data_count==Password_Length-1)
  {
    if (strcmp(Data,Master)==0) 
    {
      lcd.clear();
      ServoOpen();
      lcd.setCursor(0,0);
      lcd.print("  Door is Open");
      door = 0;
    }
    else
    {
      lcd.clear();
      lcd.setCursor(0,0);
      tone(buzzer,1000);
      lcd.print("Wrong Password");
      delay(1000);
      noTone(buzzer);
      door = 1;
    }
    clearData();
  }
}

#include <LiquidCrystal.h>

LiquidCrystal lcd(12,11,5,4,3,2);

const int sw1=10;
const int sw2=8;
const int sw3=9;
const int sw4=13;
const int sw5=6;
int vote1=0;
int vote2=0;
int vote3=0;
void setup() {
  // put your setup code here, to run once:
  pinMode(sw1,INPUT);
  pinMode(sw2,INPUT);
  pinMode(sw3,INPUT);
  pinMode(sw4,INPUT);
  pinMode(sw5,INPUT);
  lcd.begin(16,2);
  lcd.clear();
  lcd.setCursor(4,0);
  lcd.print("ELECTRONIC");
  lcd.setCursor(0,1);
  lcd.print("VOTING");
  lcd.setCursor(8,1);
  lcd.print("MACHINE");
  delay(3000);
  lcd.clear();
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  lcd.print("CAST YOUR VOTE:");
  lcd.setCursor(0,1);
  lcd.print("BJP");
  lcd.setCursor(6,1);
  lcd.print("AAP");
  lcd.setCursor(12,1);
  lcd.print("CONG");
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(sw1)==HIGH)
  {
    vote1=vote1+1;
    lcd.clear();
    lcd.setCursor(0,0);
    delay(200);
    lcd.print("THANKS FOR");
    lcd.setCursor(5,1);
    lcd.print("VOTING");
    while(digitalRead(sw4)==LOW);
    admin();  
  }
  else if(digitalRead(sw2)==HIGH)
  {
    vote2=vote2+1;
    lcd.clear();
    lcd.setCursor(0,0);
    delay(200);
    lcd.print("THANKS FOR");
    lcd.setCursor(5,1);
    lcd.print("VOTING");
    while(digitalRead(sw4)==LOW);
    admin();
  }
  else if(digitalRead(sw3)==HIGH)
  {
    vote3=vote3+1;
    lcd.clear();
    lcd.setCursor(0,0);
    delay(200);
    lcd.print("THANKS FOR");
    lcd.setCursor(5,1);
    lcd.print("VOTING");
    while(digitalRead(sw4)==LOW);
    admin();
  }
  
  if(digitalRead(sw5)==HIGH)
  {
    int max_vote=0;
    int flag=0;
    lcd.clear();
    lcd.begin(16,2);
    lcd.setCursor(0,0);
    lcd.print("BJP");
    lcd.setCursor(6,0);
    lcd.print("AAP");
    lcd.setCursor(12,0);
    lcd.print("CONG");
    lcd.setCursor(0,1);
    lcd.print(vote1);
    lcd.setCursor(6,1);
    lcd.print(vote2);
    lcd.setCursor(12,1);
    lcd.print(vote3);
    delay(2000);
    lcd.clear();
    delay(2000);
    if(vote1>max_vote)
    {
      max_vote=vote1;
    }
    if(vote2>max_vote)
    {
      max_vote=vote2;
    }
    if(vote3>max_vote)
    {
      max_vote=vote3;
    }
    if((vote1==max_vote)&&(vote2!=max_vote)&&(vote3!=max_vote))
    {
      flag=1;
      lcd.setCursor(5,0);
      lcd.print("BJP");
      lcd.setCursor(8,1);
      lcd.print("Wins!");
      delay(2000);
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("no. of votes won");
      lcd.setCursor(6,1);
      lcd.print(vote1);
      delay(2000);
    }
    if((vote2==max_vote)&&(vote1!=max_vote)&&(vote3!=max_vote))
    {
      flag=1;
      lcd.setCursor(5,0);
      lcd.print("AAP");
      lcd.setCursor(8,1);
      lcd.print("Wins!");
      delay(2000);
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("no. of votes won");
      lcd.setCursor(6,1);
      lcd.print(vote2);
      delay(2000);
    }
    if((vote3==max_vote)&&(vote1!=max_vote)&&(vote2!=max_vote))
    {
      flag=1;
      lcd.setCursor(5,0);
      lcd.print("CONG");
      lcd.setCursor(8,1);
      lcd.print("Wins!");
      delay(2000);
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("no. of votes won:");
      lcd.setCursor(6,1);
      lcd.print(vote3);
      delay(2000);
    }
    if(flag==0)
    {
      lcd.setCursor(0,0);
      lcd.print("Clash between:");
      lcd.setCursor(0,1);
      if(vote1==max_vote)
      {
        lcd.print("BJP ");
      }
      if(vote2==max_vote)
      {
        lcd.print("AAP ");
      }
      if(vote3==max_vote)
      {
        lcd.print("CONG ");
      }
      delay(2000);
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("no. of votes won:");
      lcd.setCursor(6,1);
      lcd.print(max_vote);
      delay(2000);
    }
  }
}
void admin()
{
  if(digitalRead(sw4)==HIGH)
  {
    lcd.begin(16,2);
    lcd.setCursor(0,0);
    lcd.print("CAST YOUR VOTE:");
    lcd.setCursor(0,1);
    lcd.print("BJP");
    lcd.setCursor(6,1);
    lcd.print("AAP");
    lcd.setCursor(12,1);
    lcd.print("CONG"); 
  }
}