EVM-LPC1768

Electronic Voting Machine (EVM) using LPC1768

This project is a secure and interactive Electronic Voting Machine (EVM) implemented using the LPC1768 ARM Cortex-M3 microcontroller. Developed during my SSIT Summer Internship, it demonstrates the real-world application of embedded systems in designing reliable and user-friendly voting solutions.

Features

• Three voting inputs for candidates A, B, and C via GPIO buttons.
• Admin-controlled voting sessions using separate enable and result buttons.
• LCD (16x2) display for user instructions and vote confirmation.
• LED indicators and buzzer to give visual and audio confirmation of votes.
• One vote per session logic to prevent multiple voting.
• UART communication for real-time result display on a connected PC.
• Software debouncing using Timer0.

Components Used

• LPC1768 Microcontroller
• Push Buttons (5 total)
• LEDs (3)
• Buzzer
• 16x2 LCD (4-bit mode)
• UART to USB Module
• Power Supply (3.3V)

Project Structure

How It Works

1. Admin presses the Enable button to unlock voting mode.
2. Voter presses one of three candidate buttons to vote.
3. System:
   • Confirms vote with LED + buzzer
   • Displays message on LCD
   • Logs data to PC via UART
4. System locks voting until admin re-enables.
5. Admin can press the Result button at any time to view total votes via UART.

Output Example (UART)