Traffic Light Controller

Building Arduino Traffic Controller was my first time working on Arduino as a beginner. It was a fun project as I enjoyed assembling all the parts of the system and writing coding lines. If you too are a beginner using arduino, a traffic light controller is a must-try project due to it's simplicity.

I used Mega Arduino for the project. Apart from the basic Arduino, you will need the following things to complete the project:

• A breadboard
• 3 Resistors of 50 Ω each
• Connecting wires
• Jumping wires (Male to male)
• RGB LEDs

Connect the anode of each LED to digital pins in the Arduino. In my project, I connected the red color anode to pin 8 and the green color anode to pin 10. To produce the yellow light effect, I mixed the red and green anode with the help of connecting wires and connected it to pin 9. After that, I connected the cathodes to the Arduino's ground. In the end, I connected the resistors to the breadboard.

Here is the last step. Now you just have to code the program and run them. This is the code I ran on the Arduino IDE.

// variables
int GREEN = 10;

int YELLOW = 9;

int RED = 8;

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()
{

red_light();

delay(DELAY_RED);

yellow_light();

delay(DELAY_YELLOW);

green_light();

delay(DELAY_GREEN);

}

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);

}

This should be the end result of the project.