Arduino Traffic Light Project | Beginner Tutorial, Code, Circuit & Simulation | @ChipTrails

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Step into the world of Arduino and bring a traffic light system to life! This beginner-friendly tutorial guides you through the process of programming LEDs to mimic real traffic signals—perfect for enthusiasts looking to sharpen their coding skills and explore hardware integration.

What you’ll learn:
How to control LEDs using Arduino Uno

Understanding traffic light timing (Red: 6 sec, Yellow: 3 sec, Green: 6 sec)

Writing clean, structured code with proper comments

Arduino Code:

// ----- Traffic Light Simulation using Arduino UNO -----
// This program simulates a basic traffic light using 3 LEDs:
// Red (pin 8), Yellow (pin 9), and Green (pin 10)
// LEDs will light up in a timed sequence like a real traffic signal.

// Define pin numbers for each LED
const int redPin = 8; // Red LED connected to digital pin 8
const int yellowPin = 9; // Yellow LED connected to digital pin 9
const int greenPin = 10; // Green LED connected to digital pin 10

void setup() {
// Set LED pins as OUTPUT
pinMode(redPin, OUTPUT);
pinMode(yellowPin, OUTPUT);
pinMode(greenPin, OUTPUT);
}

void loop() {
// --- RED Light ON ---
digitalWrite(redPin, HIGH); // Turn ON red LED
digitalWrite(yellowPin, LOW); // Ensure yellow LED is OFF
digitalWrite(greenPin, LOW); // Ensure green LED is OFF
delay(6000); // Wait for 6 seconds

// --- YELLOW Light ON ---
digitalWrite(redPin, LOW); // Turn OFF red LED
digitalWrite(yellowPin, HIGH); // Turn ON yellow LED
digitalWrite(greenPin, LOW); // Ensure green LED is OFF
delay(3000); // Wait for 3 seconds

// --- GREEN Light ON ---
digitalWrite(redPin, LOW); // Ensure red LED is OFF
digitalWrite(yellowPin, LOW); // Turn OFF yellow LED
digitalWrite(greenPin, HIGH); // Turn ON green LED
delay(6000); // Wait for 6 seconds

// (Loop will repeat, going back to red light)
}

Unlock the power of Arduino and create your own miniature traffic control system! Whether you're just starting or looking for an exciting new project, this tutorial has you covered.
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