7 Segment Display on Arduino

This instructable shows how to display 0-9 digits on 7 Segment Display using Arduino.

What do you need:

• Arduino Uno 3
• 7 Seven Segment Display
• 2 x 220 Ohm Resistors
• Jumper Wires

Step 1: Making Connections

Connect the pins described below:

1. Arduino Pin 2 to Pin 9.
2. Arduino Pin 3 to Pin 10.

3. Arduino Pin 4 to Pin 4.

4. Arduino Pin 5 to Pin 2..

5. Arduino Pin 6 to Pin 1.

6. Arduino Pin 8 to Pin 7.

7. Arduino Pin 9 to Pin 6.

8. GND to Pin 3 and Pin 8 each connected with 220 ohm resistors.

Step 2: Arduino Code

int a = 2;  //For displaying segment "a"

int b = 3;  //For displaying segment "b"
int c = 4;  //For displaying segment "c"
int d = 5;  //For displaying segment "d"
int e = 6;  //For displaying segment "e"
int f = 8;  //For displaying segment "f"
int g = 9;  //For displaying segment "g"

void setup() {               
  pinMode(a, OUTPUT);  //A
  pinMode(b, OUTPUT);  //B
  pinMode(c, OUTPUT);  //C
  pinMode(d, OUTPUT);  //D
  pinMode(e, OUTPUT);  //E
  pinMode(f, OUTPUT);  //F
  pinMode(g, OUTPUT);  //G
}

void displayDigit(int digit)
{
 //Conditions for displaying segment a
 if(digit!=1 && digit != 4)
 digitalWrite(a,HIGH);
 
 //Conditions for displaying segment b
 if(digit != 5 && digit != 6)
 digitalWrite(b,HIGH);
 
 //Conditions for displaying segment c
 if(digit !=2)
 digitalWrite(c,HIGH);
 
 //Conditions for displaying segment d
 if(digit != 1 && digit !=4 && digit !=7)
 digitalWrite(d,HIGH);
 
 //Conditions for displaying segment e 
 if(digit == 2 || digit ==6 || digit == 8 || digit==0)
 digitalWrite(e,HIGH);
 
 //Conditions for displaying segment f
 if(digit != 1 && digit !=2 && digit!=3 && digit !=7)
 digitalWrite(f,HIGH);
 if (digit!=0 && digit!=1 && digit !=7)
 digitalWrite(g,HIGH);
 
}
void turnOff()
{
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
}


void loop() {

 for(int i=0;i<10;i++)
 {
   displayDigit(i);
   delay(1000);
   turnOff();
 }
}