README.md

🚦 Traffic Light System using Arduino

This project demonstrates a basic traffic light control system using an Arduino board and three LEDs (Red, Yellow, Green).
Each LED turns ON and OFF sequentially with a fixed delay, simulating real-world traffic signals.

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🔗 Simulation Link

👉 Open Simulation

🔌 Circuit Diagram

👉

🔌 Circuit Connection

🔧 Components Required

• Arduino Uno / Nano / Mega
• 3 × LEDs (Red, Yellow, Green)
• 3 × 220Ω Resistors
• Breadboard
• Jumper Wires

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🔌 Pin Connections

LED Color	Arduino Pin
Red	D7
Yellow	D4
Green	D2

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🧠 Working Principle

• The Red LED turns ON for 600 ms, then turns OFF
• The Yellow LED turns ON for 600 ms, then turns OFF
• The Green LED turns ON for 600 ms, then turns OFF
• This cycle repeats continuously, simulating a traffic signal sequence

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💻 Arduino Code

#define red 7
#define yellow 4
#define green 2

void setup() {
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
}

void loop() {
  digitalWrite(red, HIGH);
  delay(600);
  digitalWrite(red, LOW);
  delay(600);

  digitalWrite(yellow, HIGH);
  delay(600);
  digitalWrite(yellow, LOW);
  delay(600);

  digitalWrite(green, HIGH);
  delay(600);
  digitalWrite(green, LOW);
  delay(600);
}

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📌 Applications

• Beginner Arduino practice
• Understanding digital output control
• Traffic signal simulation
• Embedded systems fundamentals

🚀 Future Improvements

• Adjustable timing using potentiometer
• Pedestrian crossing button
• LCD/OLED status display
• Smart traffic system using sensors

👨‍💻 Author

Bishnupriya