/* Interfacing One Digit 7-Segment LED Display with Arduino Uno 

Each of the LEDs in the display is given a positional segment with 
one of its connection pins led out from the rectangular plastic package. 
These LED pins are labeled from “a” through to “g” representing each 
individual LED. The other LED pins are connected together forming a 
common pin.
*/

int a=7; 
int b=6; 
int c=5; 
int d=11; 
int e=10; 
int f=8; 
int g=9; 
int dp=4; 



void setup() 
{ 
    int i;
    for(i=4;i<=11;i++)
    pinMode(i,OUTPUT);
} 


void loop() 
{     
    while(1) 
    {   
        clearDisplay();
        display0(); 
        delay(500); 
        clearDisplay();

        display1(); 
        delay(500); 
        clearDisplay();
        display2();
  
        delay(500); 
        clearDisplay();
        display3(); 

        delay(500);
        clearDisplay();
        display4(); 
        delay(500);

        clearDisplay(); 
        display5(); 
        delay(500);
        clearDisplay();
  
        display6(); 
        delay(500);
        clearDisplay(); 

        display7(); 
        delay(500); 
        clearDisplay();
        display8();
  
        delay(500); 
        clearDisplay();  
        display9(); 

        delay(500);      
    }
}






// clear display
void clearDisplay(void) 
{ 
    digitalWrite(a,LOW);
    digitalWrite(b,LOW);

    digitalWrite(g,LOW);
  digitalWrite(c,LOW);
    digitalWrite(d,LOW);  

    digitalWrite(e,LOW);  
  digitalWrite(f,LOW);  
} 



// display number0
void display0(void) 
{ 
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);

  digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);  
    digitalWrite(e,HIGH);
  
  digitalWrite(f,HIGH);  
} 




//display number 1
void display1(void) 
{
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
} 

//display number2
void display2(void) 
{
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);

    digitalWrite(g,HIGH);
  digitalWrite(e,HIGH);
    digitalWrite(d,HIGH);
}
  
// display number3
void display3(void) 
{ 
    digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);
    
  digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);

    digitalWrite(g,HIGH);
} 

// display number4
void display4(void) 
{
    digitalWrite(f,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);
  
} 

// display number5
void display5(void)
{ 
    digitalWrite(a,HIGH);
    digitalWrite(f,HIGH);
    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
} 

// display number6
void display6(void) 
{ 
    digitalWrite(a,HIGH);
    digitalWrite(f,HIGH);

    digitalWrite(g,HIGH);
  digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
  
    digitalWrite(e,HIGH);  
} 

// display number7
void display7(void)
{   
   digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
}
  
// display number8
void display8(void) 
{ 
    digitalWrite(a,HIGH);

    digitalWrite(b,HIGH);
    digitalWrite(g,HIGH);
  digitalWrite(c,HIGH);

    digitalWrite(d,HIGH);  
    digitalWrite(e,HIGH);  
  digitalWrite(f,HIGH);
  
} 



// display number9
void display9(void)
{ 
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(g,HIGH);

  digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);  
  digitalWrite(f,HIGH);
  
}