Traffic light system on BKIT PIC

This is my project for HCMUT Computer Engineering course CO2021 - Logic Design Project: Simulating a 4-way intersection traffic light system on the BKIT PIC development board. More details are in the report file (written in Vietnamese).

Introduction

Traffic light system is a common application of an embedded system. In this project, I will simulating such a system using the BKIT PIC development board, which is based on the PIC18F4620 microcontroller and developed by BKIT Hardware Club.

Features

The system that can work in 3 different mode: automatic countdown, manual, and standby.
In automatic countdown mode, the lights will change its state when the countdown reaches zero.
In manual mode, the lights' state can only be changed manually using the B button.
Switch between these 2 modes using button A.
In standby mode, only yellow lights will blink, switch to this mode using button #.
Next 2 features are about the countdown timer. A special condition feature is simulated using 2 buttons C and D which stands for "entering special condition" and "leaving special condition", which will change the timer accordingly using 2 sets of predefined timers. In the real world, special conditions can be something like rush hour, or the state of the traffic.
In addition to those 2 predefined timers, you can set it manually using the * and the number buttons.
The last feature is force switching: the lights can go immediately from red to green and green to red using button 0. This is to simulate the case when there is a prioritized vehicle like an ambulance or a fire truck approaching the intersection. In the real application, the button can be replaced by something like a camera or a sensor.
The output signals are simulated on a traffic light demonstration board, the design of that board on Altium Designer can be found in this repository.

Program structure

The program uses 4 modules: lcd, button, interrupt and timer. Its structure is shown in the diagram below:

Implementation

The system is designed using a state diagram based design with 14 states in total. The state diagram is shown below:

Demonstration

The video where I demonstrate the product in details can be accessed at this link: https://youtu.be/UaOuD4EGTHY

Contributors

DangLKM: https://github.com/LKMDang

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