## Introduction: 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();
}
}```

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