// #define LATCH_PIN 9
// #define CLOCK_PIN 8
// #define DATA_PIN 5
// #define stepperMotor 13
// #define numOfRegisterPins 16

// bool registers[numOfRegisterPins];

/*
Arduino Uno Pin	|  Device	          |  Device Pin |
=====================================================
2               |  7-Segment	      |  14 (Dig 1) | 
3	              |  7-Segment	      |  11 (Dig 2) |
4	              |  7-Segment	      |  10 (Dig 3) |
5	              |  7-Segment	      |  6  (Dig 4)  |
6	              |  7-Segment	      |  13 (A)     |
7	              |  7-Segment	      |  9 (B)      |
8	              |  7-Segment	      |  4 (C)      |
9	              |  7-Segment	      |  2 (D)      |
10	            |  7-Segment	      |  1 (E)      |
11	            |  7-Segment	      |  12 (F)     |
12	            |  7-Segment	      |  5 (G)      |
13	            |  7-Segment	      |  8 (Colon)  |
*/

// The segment mapping is as follows:
// 7-segment display segment mapping

/*
/-----A-----\
|           |
| F         | B
|           |
------G-------
|           |
| E         | C        /--\
|           |          |DP|
\------D-----/         \--/
*/

#define DATA_PIN  7
#define LATCH_PIN 8
#define CLOCK_PIN 9

byte digitPins[16] = {
  B0000001,  //0
  B11001111, //1
  B0010010,  //2
  B0000110,  //3
  B01001100, //4
  B0100100,  //5
  B00100000, //6
  B0001111,  //7
  B00000000, //8
  B0000100,  //9
  B00001000, //A
  B01100000, //B
  B11110010, //c
  B11000010, //d
  B10110000, //E
  B00111000, //F
};

void setup() {
  pinMode(LATCH_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(DATA_PIN,  OUTPUT);
  Serial.begin(9600);
}

void loop() {
  for (int i=0; i<16; i++) {
    digitalWrite(LATCH_PIN, LOW);
    shiftOut(DATA_PIN, CLOCK_PIN, LSBFIRST, digitPins[i]);
    digitalWrite(LATCH_PIN, HIGH);

    Serial.print("Sent: ");
    Serial.print(digitPins[i], BIN);
    Serial.println("  Decimal: " + String(i));
    delay(2000);
  }
  Serial.println("starting over again!\n");
  delay(1000);
}