// These are connected to 74HC595 shift register (used to show game score):
const int LATCH_PIN = A1;  // 74HC595 pin 12
const int DATA_PIN = A0;  // 74HC595pin 14
const int CLOCK_PIN = A2;  // 74HC595 pin 11
12, 4, 19
/* Digit table for the 7-segment display */
const uint8_t digitTable[] = {
  0b11000000,
  0b11111001,
  0b10100100,
  0b10110000,
  0b10011001,
  0b10010010,
  0b10000010,
  0b11111000,
  0b10000000,
  0b10010000,
};

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

}
int i =0;
void loop() {
  displayScore(i);
  i++;
  delay(100);
}

void sendScore(uint8_t high, uint8_t low) {
  digitalWrite(LATCH_PIN, LOW);
  shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, low);
  shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, high);
  digitalWrite(LATCH_PIN, HIGH);
}

void displayScore(int value) {
  int high = value % 100 / 10;
  int low = value % 10;
  sendScore(high ? digitTable[high] : 0xff, digitTable[low]);
}