Shift Register Tutorial

int DS1_pin = 4;
int STCP1_pin =3;
int SHCP1_pin = 2 ;

int digits [10][8]{
  {0,1,1,1,1,1,1,0}, // digit 0
  {0,0,1,1,0,0,0,0}, // digit 1
  {0,1,1,0,1,1,0,1}, // digit 2
  {0,1,1,1,1,0,0,1}, // digit 3
  {0,0,1,1,0,0,1,1}, // digit 4
  {0,1,0,1,1,0,1,1}, // digit 5
  {0,1,0,1,1,1,1,1}, // digit 6
  {0,1,1,1,0,0,0,0}, // digit 7
  {0,1,1,1,1,1,1,1}, // digit 8
  {0,1,1,1,1,0,1,1}  // digit 9
};


void display_digit(int d){
  if (digits[d][0]==1) digitalWrite(7, LOW); else digitalWrite(7, HIGH); //A
  if (digits[d][1]==1) digitalWrite(8, LOW); else digitalWrite(8, HIGH); //B
  if (digits[d][2]==1) digitalWrite(9, LOW); else digitalWrite(9, HIGH); //C
  if (digits[d][3]==1) digitalWrite(2, LOW); else digitalWrite(2, HIGH); //D
  if (digits[d][4]==1) digitalWrite(3, LOW); else digitalWrite(3, HIGH); //E
  if (digits[d][5]==1) digitalWrite(5, LOW); else digitalWrite(5, HIGH); //F
  if (digits[d][6]==1) digitalWrite(4, LOW); else digitalWrite(4, HIGH); //G
}

void DisplayDigit(int Digit)
{
    digitalWrite(STCP1_pin,LOW);
    for (int i = 7; i>=0; i--)
   {
    digitalWrite(SHCP1_pin,LOW);
    if (digits[Digit][i]==1) digitalWrite(DS1_pin, LOW); 
    if (digits[Digit][i]==0) digitalWrite(DS1_pin, HIGH);
    digitalWrite(SHCP1_pin,HIGH);
   }
   digitalWrite(STCP1_pin, HIGH); 
}


void setup() {  
  pinMode(DS1_pin, OUTPUT);
  pinMode(STCP1_pin, OUTPUT);
  pinMode(SHCP1_pin, OUTPUT);
}

void loop() {
for (int i=0;i<10;i++){  
  DisplayDigit(i);  
  delay(300);
}
}