Traffic light

A road signal for directing vehicular traffic by means of colored lights, typically red for stop, green for go, and yellow for wait.

BeginnerFull instructions provided2,489

Things used in this project

Hardware components

Arduino UNO

Seeed Studio Grove - 16 x 2 LCD (White on Blue)

5 mm LED: Red

5 mm LED: Yellow

5 mm LED: Green

Solderless Breadboard Half Size

Jumper wires (generic)

9V battery (generic)

Software apps and online services

Arduino IDE

Story

Traffic Light

The Idea

A road signal for directing vehicular traffic by means of colored lights, typically red for stop, green for go, and yellow for proceed with caution.

Prototype costs

200 pounds.

Code

Traffic_light.ino

int ledr = 2;
int ledy = 3;
int ledg = 4;

int i=0;

#include<LiquidCrystal.h>
LiquidCrystal lcd(7,8,9,10,11,12);

byte STOP[8]={
  B00000,
  B01110,
  B10011,
  B10101,
  B11001,
  B01110,
  B00000,
  B00000

};

byte GO[8]={
  B01110,
  B01110,
  B11111,
  B10101,
  B10101,
  B01110,
  B01010,
  B01010
};

void setup() {
  pinMode(ledr,OUTPUT);
  pinMode(ledy,OUTPUT);
  pinMode(ledg,OUTPUT);

  lcd.begin(16,2);

  lcd.createChar(0,STOP);
  lcd.createChar(1,GO);
}

void loop() {
  
  //RED
  digitalWrite(ledr,HIGH);

  lcd.setCursor(4,0);
  lcd.write(byte(0));
  lcd.print(" STOP ");
  lcd.write(byte(0));
 
  for(i=0;i<11;i++)
    {lcd.setCursor(7,1);
     lcd.print(i);
     delay(1000);}


  digitalWrite(ledy,HIGH);

  lcd.setCursor(7,1);
     lcd.print("11");
  
  delay(1000);
  digitalWrite(ledy,LOW);
  
  lcd.setCursor(7,1);
     lcd.print("12");
  
  delay(1000);
  digitalWrite(ledy,HIGH);

  lcd.setCursor(7,1);
     lcd.print("13");
  
  delay(1000);
  digitalWrite(ledy,LOW);

  lcd.setCursor(7,1);
     lcd.print("14");
  
  delay(1000);
  digitalWrite(ledy,HIGH);

  lcd.setCursor(7,1);
     lcd.print("15");
  
  delay(1000);
  digitalWrite(ledy,LOW);
  digitalWrite(ledr,LOW);



  lcd.clear();
   
 //GREEN 
  digitalWrite(ledg,HIGH);

  lcd.setCursor(5,0);
  lcd.write(byte(1));  
  lcd.print(" GO ");
  lcd.write(byte(1));  

  for(i=0;i<11;i++)
    {lcd.setCursor(7,1);
     lcd.print(i);
     delay(1000);}
     
   digitalWrite(ledy,HIGH);

  lcd.setCursor(7,1);
     lcd.print("11");
  
  delay(1000);
  digitalWrite(ledy,LOW);
  
  lcd.setCursor(7,1);
     lcd.print("12");
  
  delay(1000);
  digitalWrite(ledy,HIGH);

  lcd.setCursor(7,1);
     lcd.print("13");
  
  delay(1000);
  digitalWrite(ledy,LOW);

  lcd.setCursor(7,1);
     lcd.print("14");
  
  delay(1000);
  digitalWrite(ledy,HIGH);

  lcd.setCursor(7,1);
     lcd.print("15");
  
  delay(1000);
  digitalWrite(ledy,LOW);
  digitalWrite(ledg,LOW);



  lcd.clear();
}