Traffic Light Controller by Using Arduino

Introduction:

Traffic light controller helps to manage the traffic and to maintain proper traffic management. These systems are placed at the intersections of the road or at the crossings to avoid congestions and accidents. The systems indicate to the driver by using different colors of light. Therefore, it is simple to avoid congestion at the intersections.

Component Required:

• Arduino Uno
• Uno Cable
• Small Breadboard
• LEDs(Red*3,Yellow*3,Green*3)
• Resistor(220ohm*3)
• Jumper Wires
• 9V battery
• Battery snapper connector

Circuit Diagram:

Connections:

Connect all LED’s GND pin to GND through 220ohm resistors

Connect 1^st Red LED +ve pin to Arduino pin 8

Connect 2^nd Red LED +ve pin to Arduino pin 5

Connect 3^rd Red LED +ve pin to Arduino pin 2

Connect 1^st yellow LED +ve pin to Arduino pin 9

Connect 2^nd yellow LED +ve pin to Arduino pin 6

Connect 3^rd yellow LED +ve pin to Arduino pin 3

Connect 1^st Green LED +ve pin to Arduino pin 10

Connect 2^nd Green LED +ve pin to Arduino pin 7

Connect 3^rd Green LED +ve pin to Arduino pin 4

Code for Traffic Light Controller by Using Arduino

void setup() {

  // configure the output pins

  pinMode(2,OUTPUT);

  pinMode(3,OUTPUT);

  pinMode(4,OUTPUT);

  pinMode(5,OUTPUT);

  pinMode(6,OUTPUT);

  pinMode(7,OUTPUT);

  pinMode(8,OUTPUT);

  pinMode(9,OUTPUT);

  pinMode(10,OUTPUT);

}

void loop()

{

  digitalWrite(2,1); //enables the 1st set of signals

  digitalWrite(7,1);

  digitalWrite(10,1);

  digitalWrite(4,0);

  digitalWrite(3,0); 

  digitalWrite(6,0);

  digitalWrite(8,0);

  digitalWrite(9,0);

  digitalWrite(5,0);

  delay(5000);

  digitalWrite(3,1); //enables the yellow lights

  digitalWrite(6,1);

  digitalWrite(2,0);

  digitalWrite(7,0);

  delay(1000);

  digitalWrite(4,1); //enables the 2nd set of signals

  digitalWrite(5,1);

  digitalWrite(10,1);

  digitalWrite(2,0);

  digitalWrite(3,0); 

  digitalWrite(6,0);

  digitalWrite(8,0);

  digitalWrite(9,0);

  digitalWrite(7,0);

  delay(5000);

  digitalWrite(9,1); //enables the yellow lights

  digitalWrite(6,1);

  digitalWrite(10,0);

  digitalWrite(5,0); 

  digitalWrite(4,0);

  delay(1000);

  digitalWrite(8,1); //enables the 3rd set of signals

  digitalWrite(4,1);

  digitalWrite(7,1);

  digitalWrite(2,0);

  digitalWrite(3,0); 

  digitalWrite(5,0);

  digitalWrite(6,0);

  digitalWrite(9,0);

  digitalWrite(10,0);

  delay(5000);

  digitalWrite(9,1); //enables the yellow lights

  digitalWrite(3,1);

  digitalWrite(7,0);

  digitalWrite(8,0);

  digitalWrite(4,0);

  delay(1000);  

}