Smart Traffic Light System Using Arduino

Kumaresh Rajalingam

6y19.8k19100Article

IoT ArduinoTrafficLightTraffic Light System

19 Comments

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Delpin Susai Raj10y ago
Nice article
Kumaresh Rajalingam10y ago
Thank you santhakumar sir
Santhakumar Munuswamy10y ago
Thanks for nice share
Kumaresh Rajalingam10y ago
Thanks Pramod Sir
Kumaresh Rajalingam10y ago
Thanks gowtham Sir
Kumaresh Rajalingam10y ago
Thanks Raja sir
Pramod Thakur10y ago
Nice..
Gowtham K10y ago
Good One
Raja T10y ago
Nice, Thanks for sharing
Kumaresh Rajalingam10y ago
Thank you sibeesh bro
Kumaresh Rajalingam10y ago
Thank you Amit sir
Kumaresh Rajalingam10y ago
Thank you shubham sir
Sibeesh Venu10y ago
Nice Share
Amit Kumar Singh10y ago
Nice one
Shubham Kumar10y ago
nice one +1
Kumaresh Rajalingam10y ago
Thanks Jaco
Kumaresh Rajalingam10y ago
Thanks Kartiga
Sr Karthiga10y ago
Good one sir
Jaco Zwarts10y ago
Nice share

Introduction

In this article, we are going to build little components with LED's called a Smart Traffic Light System

Required Components:

Arduino Uno
Led-3
Bread Board
Push Button
Some Wires

Connections:

Connect LED anode pin to the Arduino digital pin 10,11,12.
And Cathode pin to the Gnd.
Push button to the digital pin 7.

Program

int one = 10;
int two = 11;
int three = 12;
int btn = 7;
int state = 0;
void setup()
{
pinMode(one, OUTPUT);
pinMode(two, OUTPUT);
pinMode(three, OUTPUT);
}
void loop()
{
if (digitalRead(btn))
{
if (state == 0)
{
setLights(HIGH, LOW, LOW);
state = 1;
} else if (state == 1)
{
setLights(HIGH, HIGH, LOW);
state = 2;
} else if (state == 2)
{
setLights(LOW, LOW, HIGH);
state = 3;
} else if (state == 3)
{
setLights(LOW, HIGH, LOW);
state = 0;
}
delay(1000);
}
}
void Traffic(int red, int yellow, int green)
{
digitalWrite(one, red);
digitalWrite(two, yellow);
digitalWrite(three, green);
}

Explanation:

Declare the variables as one, two, three btn in the integer data type and assign the digital pins to that variables and set the state as "0." In the setup() function, we want to set the pinMode for our LED's and in the loop() function, we want to give the condition for our LEDs, such as, first we want to read the button value from the analog pin. For that, we use the built-in function called digitalRead. It reads the analog value from the Arduino board

if (state==0) set the led1 as HIGH
if (state==1) led1,led2 are HIGH
if (state==2) led3 is HIGH
if(state==2)led2 is HIGH

And set the delay time as 1000 s for the 3 led's and create the function called Traffic with parameters such as int red, int yellow, int green.

DigitalWrite:

Writes the HIGH or LOW value to the digital pins. Inside the Traffic function, we want to set the digitalWrite function like this,

void Traffic(int red, int yellow, int green)
{
digitalWrite(one, red); //one
digitalWrite(two, yellow); //two
digitalWrite(three, green); //three
}

Output