RobotDyn Segment Display Module - 8 Character - Decimal - Yellow - 74HC595

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const int clockpin = 7; //SCK
const int latchpin = 5; //RCK 
const int datapin = 6;  //DIO
const int num_of_digits = 8;

/* Segment bit location(7=MSB, 0=LSB):
 * 
 *    |--0--|
 *   5|     |1
 *    |--6--|
 *   4|     |2
 *    |--3--| **7
 */

// Array with possible values(0 = segment ON, 1 = segment off)
byte value[] ={ B11000000, // 0
                B11111001, // 1
                B10100100, // 2
                B10110000, // 3
                B10011001, // 4
                B10010010, // 5
                B10000010, // 6
                B11111000, // 7
                B10000000, // 8
                B10010000, // 9
                B11111111};// display nothing

byte digit[] ={ B00010000, // left segment
                B00100000,
                B01000000,
                B10000000,
                B00000001, 
                B00000010,
                B00000100,
                B00001000 }; // right segment

void showDigit(int segmentnum, int number, bool showdecimalpoint)
{
  digitalWrite(latchpin,LOW);
  byte value_temp = value[number];
  value_temp = showdecimalpoint ? (value_temp & B01111111) : value_temp;
  shiftOut(datapin,clockpin,MSBFIRST,value_temp);
  shiftOut(datapin,clockpin,MSBFIRST,digit[segmentnum]);  
  digitalWrite(latchpin,HIGH);
}

int counter = 0;
void demoDelay()
{
  // *** Delay for demo purposes only ***
  counter++;
  if(counter <= num_of_digits)
  {
    delay(200);
  }
  else
  {
    delay(1);
    if(counter >= (num_of_digits*200))
    {
      counter = 0;
    }
  }
  // ************************************
}
                
void setup() {
  pinMode(clockpin, OUTPUT);
  pinMode(latchpin, OUTPUT);
  pinMode(datapin, OUTPUT);
}

void loop() {;
  for(int i = 0; i < num_of_digits; i++)
  {
    showDigit(i, i, true);
    demoDelay();
  }
}