Published October 4, 2017 © GPL3+

Arduino Traffic Light Simulator

Simulate a traffic light using an Arduino and LEDs! This project is super cool to watch and easy to make!

BeginnerFull instructions provided1 hour249,085

Things used in this project

Hardware components

Arduino UNO

Any kind of 'Uno" will do. I have a Geekcreit Uno that works fine.

Breadboard (generic)

Jumper wires (generic)

Male/Male required

LED (generic)

You will need red, green, and blue lights

Arduino USB 2.0 data Cable

Resistor 100 ohm

Brown, Black, Brown

Software apps and online services

Arduino IDE

Story

This simple little project uses an Arduino and some LEDs to replicate a traffic light. It uses code as an internal timer and continues to run until you cut the Arduino's power supply.

Okay. The materials are here as follows:

1. Arduino/Genuino/Geekcreit/Whatever Uno

Be sure that you carefully place wires as the pin layout may be different depending on which board you have. This project will work on a normal Arduino Uno.

2. Breadboard

3. Jumper Wires

Male to Male

4. Red, Yellow, and Green LED lights

5. Arduino USB 2.0 Cable

Alright. Let's begin, shall we??

Step 1: Supply power to the breadboard

Yes, I know that there's only one wire where there would usually be two, but trust me: Follow this exactly the way you see it. I've revised this post over and over, it's completely correct.

Insert one side of the jumper wire into GND on the board. Lead the other side to the breadboard. Put it on the far right column on the breadboard, at the top. This is the ground column. ALL the way to the right. Take a look at the picture and/or the schematics if you don't understand.

Step two: Adding the LEDs

Take out your LEDs and resistors. Place one end of the resistor in the column on the right, the same column we connected our jumper wire to. Extend the other end of the breadboard into the main part of the breadboard. Attach the resistor to any row you like. Our LEDs will go on the same row. We will stick one end of the LED on one side of the breadboard, and the other end on the other side of the breadboard. The short end of the LED will go on the side your resistors are on, the right side. Extend the other end of the LED to the right side of the breadboard. (If you don't put the LEDs in correctly, the project will not work.)

Step three: Completing the circuit

Alright. This is the last part. Take another jumper wire, put it on the same row that you have an LED on. This is where the wires will go:

Green LED: Port 2, Digital PWM section

Yellow LED, Port 3, Digital PWM section

Red LED, Port 4, Digital PWM section

If you don't understand, check the schematics are refer to the pictures.

Now, upload your code and you're finished!

(See, what did I tell ya?? It works!!)

Code

Arduino Traffic Light Code

// variables
int GREEN = 2;
int YELLOW = 3;
int RED = 4;
int DELAY_GREEN = 5000;
int DELAY_YELLOW = 2000;
int DELAY_RED = 5000;


// basic functions
void setup()
{
  pinMode(GREEN, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(RED, OUTPUT);
}

void loop()
{
  green_light();
  delay(DELAY_GREEN);
  yellow_light();
  delay(DELAY_YELLOW);
  red_light();
  delay(DELAY_RED);
}

void green_light()
{
  digitalWrite(GREEN, HIGH);
  digitalWrite(YELLOW, LOW);
  digitalWrite(RED, LOW);
}

void yellow_light()
{
  digitalWrite(GREEN, LOW);
  digitalWrite(YELLOW, HIGH);
  digitalWrite(RED, LOW);
}

void red_light()
{
  digitalWrite(GREEN, LOW);
  digitalWrite(YELLOW, LOW);
  digitalWrite(RED, HIGH);
}

Credits

Zachary Haslam

1 project • 84 followers

My name is Zach, and I'm 15. I've been developing for aImost 4 years now. specialize in Python and Linux.

Thanks to Arduino My Life Up .

Arduino Traffic Light Simulator

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Traffic Light Schematics

Code

Arduino Traffic Light Code

Credits

Zachary Haslam

Comments

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Arduino Traffic Light Simulator

Arduino Traffic Light Simulator

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Traffic Light Schematics

Code

Arduino Traffic Light Code

Credits

Zachary Haslam

Comments

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