🎓 Final Year Diploma Project
👨🔧 Developed by: Akshay Kumar , Pragati Tiwari , Annika , Shivalika.
🏫 Sant Longowal Institute of Engineering and Technology, Department of Instrumentation.
📅 Academic Year: 2024–2025
This project is a prototype of an Electronic Voting Machine (EVM) designed using Arduino Uno, LCD display, and push buttons. It demonstrates secure vote casting, real-time result display, and automatic reset after each voting session.
- Arduino Uno
- LiquidCrystal LCD
- Embedded C++
- Push buttons, breadboard, resistors
main.ino: The complete Arduino source codeEVM_Project_Report.pdf: Final project report (15 pages)circuit_diagram.png: Circuit connections of the components
- Akshay Kumar - Circuit Design, Coding, Documentation
- Pragati tiwari and Shivalika - Research, Testing
- Annika - Debugging, LCD Interface
- Vote for Candidate A or B
- View current result
- Auto-reset after each result cycle
- LCD interaction for user-friendly experience
The LCD is used in 4-bit mode and connected as follows:
| LCD Pin | Connection |
|---|---|
| RS | Arduino Pin 7 |
| E | Arduino Pin 8 |
| D4 | Arduino Pin 9 |
| D5 | Arduino Pin 10 |
| D6 | Arduino Pin 11 |
| D7 | Arduino Pin 12 |
| VSS | GND |
| VDD | 5V |
| V0 | Middle pin of 10kΩ potentiometer |
| RW | GND |
| A (LED+) | 5V (via 220Ω resistor) |
| K (LED-) | GND |
📌 Note: Connect a 10kΩ potentiometer to control contrast via V0 pin.
Each button connects to the Arduino with internal pull-up resistors:
| Button | Arduino Pin | Other Terminal |
|---|---|---|
| Button A | Pin 2 | GND |
| Button B | Pin 3 | GND |
| Result Button | Pin 4 | GND |
⚙️ These buttons are configured as
INPUT_PULLUPin the code, keeping them HIGH when unpressed and LOW when pressed.
Used to adjust LCD contrast:
| Potentiometer Pin | Connection |
|---|---|
| One End | 5V |
| Other End | GND |
| Middle Pin | LCD V0 |
(Tinkercad simulation of the actual project)
This project is open-source and free to use for academic and learning purposes.