Traffic Signal Application on 8051 Controller

Introduction

• Presented by Shashanan
• Focus on a simple application using the 8051 microcontroller: a traffic signal system.

Resources

• Follow along on YouTube: Aerotech Solutions
• Also available on Facebook.

Application Overview

• Basic application using LEDs to represent traffic signal colors (Red, Green, Yellow).
• Developed source code using Embedded C with Keil IDE.
• Simulated using Proteus simulation tool.

Components Required

• Power Supply: 5V DC source
• Microcontroller: 8051 (not just a 40 pin device)
  • Additional components: Crystal oscillator, reset connections.
• Traffic Signal: Implemented using three different color LEDs.

Circuit Design

• Circuit diagram created in Proteus simulation tool.
• Connections made to GPIOs of microcontroller using Port 2 and Port 3.
• 12 I/O pins used from the controller (LSB part of GPIOs).

Source Code Overview

• Code written in Keil Micro Vision.
• Declarations before the main function using SBIT data type and global header file (rej51.h).
• User-defined names:
  • E: East
  • W: West
  • N: North
  • S: South
• I/O Declarations: Use uppercase for I/O port letters for SFR registers.
• Delay Function: User-defined function for time delays.

Initial Setup

• Set all I/Os to low (0).
• Logic 0 (0x00) used for off state.

Traffic Signal Logic

1. East Green On:

   • Other three directions (North, South, West) show Red.
   • Duration: 30 seconds.

2. Transition to Yellow:

   • Yellow signal on for a brief time (less than red/green).

3. North Green On:

   • East Red remains on.
   • Duration: 30 seconds.

4. West Green On:

   • Yellow signals activated briefly (10 seconds).

5. South Green On:

   • West Red remains on.
   • Yellow signal activated briefly.

6. Return to East Green:

   • Cycle continues.

Simulation

• Use Proteus simulation tool to check the application.
• Link the hex file (not the .c file) for the simulation to run.
• Watch the operation of the signals clearly:
  • One signal green, others red, and yellow operating with less time.

Training and Support

• Offers online/offline training and project support.
• Hardware support and component sales available.
• Contact details provided for inquiries (phone/WhatsApp/email).

Conclusion

• Thank you for watching!
• Encouragement to reach out with questions or project requirements.