Traffic lights with Arduino

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   In this project we will create an integrated program, to know the traffic , And the changes that cause the three LEDs to glow.
   We will choose to study the traffic flow at the traffic intersection.
   For this project we will need:

4-LEDs yellow , 4-LEDs red , 4-LEDs green , 12 resistor 220 ohm , 2Breadboard , Arduino UNO , Jumper wires

Control to 6 leds

GND LED red1 ----> PIN 2
GND LED yellow1 ----> PIN 3
GND LED green1 ----> PIN 4

GND LED red2 ----> PIN 5
GND LED yellow2 ----> PIN 6
GND LED green2 ----> PIN 7

   
The cationic electrodes of the LEDs connect to the 3.3Volts . We rely on this electronic layout:

CASE1:

📒  on --->> the red lad 1 and the green lad 2 .

Time taken 1000 ms

digitalWrite(red1, LOW);      // LOW ------->>>  LED==1  and HIGH ------- >>>  LED == 0 
digitalWrite(green2, LOW); 
delay(1000);

CASE2:

📒  oFF--->> the green lad 2  .

📒  on --->> the yellow lad 2 .

Time taken 500ms

digitalWrite(green2, HIGH);
digitalWrite(yellow2, LOW);
delay(500);

CASE3:

📒  oFF --->> the yellow lad 2 and red lad 1 .

📒  on --->> the red lad 2 and green lad 1 .

Time taken 1000 ms

digitalWrite(yellow2, HIGH);
digitalWrite(red1, HIGH);
digitalWrite(red2, LOW);
digitalWrite(green1, LOW);
delay(1000);

CASE4:

📒  oFF --->> the green lad 1 .

📒  on --->> the yellow lad 1 .

Time taken 500 ms

digitalWrite(green1, HIGH);
digitalWrite(yellow1, LOW);
delay(500);

CASE5:

   The program returns to the starting point, so this tag must be added at the starting point for the program to be valid.

digitalWrite(yellow1, HIGH);   digitalWrite(red2, HIGH);

📒  on --->> the red lad 1 and the green lad 2 .

📒  oFF --->>the yellow lad 1 and the green lad 2 .

Time taken 1000 ms

digitalWrite(red1, LOW);      // LOW ------->>>  LED==1  and HIGH ------- >>>  LED == 0 
digitalWrite(green2, LOW);
digitalWrite(yellow1, HIGH);
digitalWrite(red2, HIGH);
delay(1000);

  Full Code:

//  Traffic lights with Arduino :

int red1=2;        // Determine the pin number for the LED
int yellow1=3;
int green1=4;
int red2=5;
int yellow2=6;
int green2=7;
 void setup()
 {
  pinMode(red1,OUTPUT);        // Determine LED as output
  pinMode(yellow1,OUTPUT);
  pinMode(green1,OUTPUT);
  pinMode(red2,OUTPUT);
  pinMode(yellow2,OUTPUT);
  pinMode(green2,OUTPUT);
   }
void loop()
{
digitalWrite(red1, LOW);      // LOW ------->>>  LED==1  and HIGH ------- >>>  LED == 0 
digitalWrite(green2, LOW);
digitalWrite(yellow1, HIGH);
digitalWrite(red2, HIGH);
delay(1000);
digitalWrite(green2, HIGH);
digitalWrite(yellow2, LOW);
delay(500);
digitalWrite(yellow2, HIGH);
digitalWrite(red1, HIGH);
digitalWrite(red2, LOW);
digitalWrite(green1, LOW);
delay(1000);
digitalWrite(green1, HIGH);
digitalWrite(yellow1, LOW);
delay(500);
   }

 Through this simple explanation we have reached the end of our first experience in the field of traffic lights.

Intersection traffic signal

After we learned how to control traffic lights, we can now add 6 more LEDs to make an intersection traffic light.

You can try the corresponding scheme:

   We will be based on the same code as before

   But remember, you can always modify the code and add something new to the experience.

   Here you will find a full section on the experience and a model of this traffic intersection was made.

Important :☝☝☝☝You can modify the project by adding the left and right signs.

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