Stopwatch Simulation – PIC Microcontroller

Overview

This project implements a digital stopwatch using a PIC microcontroller, programmed in C (PIC C / CCS C compiler).
The assignment was to program the stopwatch application that supports start/stop, pause, reset, and lap-time recording according to the given circuit design and the assignment instructions.

The repository contains:

• main.c → Source code for the stopwatch (CCS PIC C).
• main.hex → Compiled hex file to load into the circuit.
• Stopwatch Circuit.simu → Circuit simulation file for SimulIDE.

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Features

The stopwatch behaves as follows:

• When first starting or on reset, LCD shows:

  START STOPWATCH
  00:00:00
  

• Start/Stop button:

  • Starts counting time in format mm:ss:cc.
  • Can pause/resume the stopwatch.
  • While paused, the display shows "PAUSED mm:ss:cc".

• Lap button:

  • Records lap times.
  • Displayed in format "LAP# mm:ss:cc".
  • Supports up to 10 laps.

• Up/Down buttons:

  • Allow browsing through stored lap times when stopwatch is paused or running.

• Reset button:

  • First press: displays "STOPPED mm:ss:cc".
  • Second press: fully resets stopwatch and clears lap records.

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Requirements

To run this project, you need:

• SimulIDE → for circuit simulation.

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How to Run the Stopwatch

1. Open the circuit in SimulIDE:

   • Launch SimulIDE.
   • Open the file Stopwatch Circuit.simu.

2. Load the compiled code into the microcontroller:

   • In the circuit, click on the PIC microcontroller component.
   • Load the provided main.hex file.

3. Run the simulation:

   • Press the Play button in SimulIDE.
   • Interact with the circuit using the buttons connected to the PIC pins.
   • Observe the stopwatch behavior on the LCD.

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Assignment Reference

This project was created as part of Epoka University Course CEN389 – Embedded Systems homework.