// 74HC595 Pins
const int dataPin  = 2;
const int latchPin = 3;
const int clockPin = 4;

// Common Anode single segment patterns (gfedcba)
// Only ONE segment ON at a time (LOW = ON)

byte segments[] = {
  0b11111110, // a
  0b11111101, // b
  0b11111011, // c
  0b11110111, // d
  0b11101111, // e
  0b11011111, // f
  0b10111111  // g
};

void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
}

void loop() {

  for (int digit = 0; digit < 5; digit++) {
    for (int seg = 0; seg < 7; seg++) {

      digitalWrite(latchPin, LOW);

      // Send to 3 displays
      for (int i = 4; i >= 0; i--) {
        if (i == digit) {
          shiftOut(dataPin, clockPin, MSBFIRST, segments[seg]);
        } else {
          shiftOut(dataPin, clockPin, MSBFIRST, 0xff); // all off
        }
      }

      digitalWrite(latchPin, HIGH);
    }
  }
}