// https://forum.arduino.cc/t/making-a-clock-clock/1320259/
// https://wokwi.com/projects/345206751024382546

const byte digit[][3]  = [{2, 3}, { 4, 5}, {6, 7}]; // data pins for four digits
const byte stepdir[][3] = [{0, 2, 4}, {1, 3, 5}]; // column of three clocks
const byte dclPin[][3]  = [{x, y, z}, {x, y, z}, {x, y, z}]; // data, clock, latch

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

void loop() {
}

void setRegisterPin(int index, int value) {
  // Set an individual pin HIGH or LOW
  registers[index] = value;
}

void writeRegisters() {
  // Set and display registers
  digitalWrite(LATCH_PIN, LOW);

  for (int i = numOfRegisterPins - 1; i >= 0; i--) {
    digitalWrite(CLOCK_PIN, LOW);
    digitalWrite(DATA_PIN, registers[i]);
    digitalWrite(CLOCK_PIN, HIGH);
  }
  digitalWrite(LATCH_PIN, HIGH);
}

int pattern = 0b10101010;
void showPattern() {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, pattern);
  digitalWrite(latchPin, HIGH);
  delay(500);
  pattern = ~pattern; // Invert the pattern
}