Arduino UNO Based Electronic Voting System with ILI9341 TFT Display

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The Arduino UNO Based Electronic Voting System with ILI9341 TFT Display is an advanced microcontroller-based digital polling solution designed for secure, transparent, and real-time vote counting. This project utilizes the powerful Arduino UNO development board to control the entire voting mechanism, while the high-resolution ILI9341 TFT LCD screen provides an interactive graphical interface for displaying candidate names, voting instructions, and live vote tallies.

The system integrates multiple push buttons, each assigned to a specific candidate. When a voter presses a button, the Arduino detects the input signal, increments the corresponding vote count in memory, and instantly updates the results on the TFT display. A dedicated master control button is included to start or control the voting session, ensuring proper management and preventing unauthorized voting actions.

The ILI9341 TFT display enhances the system by offering clear text rendering, structured layout design, and real-time graphical updates. This improves user experience compared to traditional LCD-based voting projects. The interface can be customized to show welcome screens, voting status messages, total votes cast, and final results after polling ends.

From a technical perspective, this project demonstrates key embedded systems concepts including:

  • Digital input processing using push buttons

  • Debouncing techniques for accurate vote registration

  • Real-time data updating and memory management

  • SPI communication between Arduino UNO and ILI9341 TFT

  • User interface design on a graphical display

  • Structured programming for secure vote handling

Code:
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <SPI.h>

// TFT display setup (connect appropriately to your setup)
#define TFT_CS     10
#define TFT_RST    9   // Or set to -1 and connect to Arduino RESET pin
#define TFT_DC     8
#define TFT_MOSI   11
#define TFT_CLK    13
#define TFT_MISO   12

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

const int masterButtonPin = 7;
const int voteButtons[12] = {22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33};

int voteCounts[12] = {0};  // Vote counts for each candidate
bool votingStarted = false;

const char* candidateNames[12] = {
  "Candidate A", "Candidate B", "Candidate C", "Candidate D",
  "Candidate E", "Candidate F", "Candidate G", "Candidate H",
  "Candidate I", "Candidate J", "Candidate K", "Candidate L"
};

void setup() {
  Serial.begin(9600);
 
  // Initialize TFT display
  tft.begin();
  tft.setRotation(3); // Set rotation (adjust for your layout)
  tft.fillScreen(ILI9341_BLACK);
  tft.setTextSize(2);
  tft.setTextColor(ILI9341_WHITE);
 
  // Master button and voting buttons
  pinMode(masterButtonPin, INPUT_PULLUP);
  for (int i = 0; i < 12; i++) {
    pinMode(voteButtons[i], INPUT_PULLUP);
  }

  // Initial display message
  tft.setCursor(0, 0);
  tft.println("Ready for voting");
}

void loop() {
  if (digitalRead(masterButtonPin) == LOW && !votingStarted) {
    votingStarted = true;
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(0, 0);
    tft.println("Voting Started");
    delay(500);  // Debounce delay
  }

  if (votingStarted) {
    for (int i = 0; i < 12; i++) {
      if (digitalRead(voteButtons[i]) == LOW) {
        voteCounts[i]++;
        displayVotes();  // Update the display with vote counts
        delay(500);  // Debounce delay to prevent double counts
      }
    }
  }
}

void displayVotes() {
  tft.fillScreen(ILI9341_BLACK);  // Clear screen
  tft.setCursor(0, 0);  // Reset cursor position
  for (int i = 0; i < 12; i++) {
    tft.setCursor(0, i * 20);  // Adjust line spacing
    tft.print(candidateNames[i]);
    tft.print(": ");
    tft.println(voteCounts[i]);  // Print the vote count for each candidate
  }
}

The electronic voting system is ideal for:

  • Engineering and diploma final year projects

  • Arduino and embedded systems learning

  • Science exhibitions and technical demonstrations

  • Prototype digital polling systems

  • Educational institution voting simulations

The design is scalable, allowing additional candidates, password-based access control, EEPROM vote storage, buzzer confirmation feedback, or biometric authentication integration for enhanced security.

Overall, this Arduino-based electronic voting machine project provides a cost-effective, compact, and efficient digital voting solution while serving as an excellent hands-on learning platform for microcontroller programming and hardware interfacing.

 

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