birthday

#define OUT_A 0
#define OUT_B 1
#define OUT_C 2
#define OUT_D 3
#define SEG_G 4
#define DRIVER_ENABLE 5

#define DISP_DASH -1
#define DISP_BLANK -2

int numbers[] = {0, 6, DISP_DASH, 1, 3, DISP_DASH, 0, 0, DISP_BLANK};
int index = 0;

void setup() {
  pinMode(OUT_A, OUTPUT);
  pinMode(OUT_B, OUTPUT);
  pinMode(OUT_C, OUTPUT);
  pinMode(OUT_D, OUTPUT);
  pinMode(SEG_G, OUTPUT);
  pinMode(DRIVER_ENABLE, OUTPUT);
}

void loop() {
  if(index >= (sizeof(numbers)/sizeof(int))) {
    index = 0;
  }

  switch(numbers[index]) {
    case DISP_DASH:
      segDash();
      break;
    case DISP_BLANK:
      segBlank();
      break;
    default:
      segWrite(numbers[index]);
      break;
  }

  index++;

  delay(1000);
}

void segDash() {
  digitalWrite(DRIVER_ENABLE, LOW);
  digitalWrite(SEG_G, LOW); //OUTPUT ON LOW
  digitalWrite(OUT_A, 0);
  digitalWrite(OUT_B, 0);
  digitalWrite(OUT_C, 0);
  digitalWrite(OUT_D, 0);
}

void segWrite(int number) {
  digitalWrite(DRIVER_ENABLE, HIGH);
  digitalWrite(SEG_G, HIGH); //OUTPUT ON LOW
  digitalWrite(OUT_A, number & 0b0001);
  digitalWrite(OUT_B, number & 0b0010);
  digitalWrite(OUT_C, number & 0b0100);
  digitalWrite(OUT_D, number & 0b1000);
}

void segBlank() {
  digitalWrite(DRIVER_ENABLE, LOW);
  digitalWrite(SEG_G, HIGH); //OUTPUT ON LOW
  digitalWrite(OUT_A, LOW);
  digitalWrite(OUT_B, LOW);
  digitalWrite(OUT_C, LOW);
  digitalWrite(OUT_D, LOW);
}