// Pin setup pour les 74HC595
const int dataPin = 2;    // DS (Data)
const int clockPin = 3;   // SH_CP (Shift Clock)
const int latchPin = 4;   // ST_CP (Storage Clock)

// Define the number of LEDs and shift registers
const int numLEDs = 60;
const int numRegisters = 8;

// Array to store the LED states
byte ledStates[numRegisters];

void setup() {
  // Set the shift register pins as outputs
  pinMode(dataPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
}

void loop() {
  // Get the current number of seconds
  int currentSeconds = millis() / 1000;
  currentSeconds = currentSeconds % 60; // Reset to 0 after 60 seconds

  // Light up the number of LEDs equal to the current number of seconds
  for (int i = 0; i < currentSeconds; i++) {
    int registerIndex = i / 8;
    int bitIndex = i % 8;
    bitSet(ledStates[registerIndex], bitIndex);
  }

  // Turn off the remaining LEDs
  for (int i = currentSeconds; i < numLEDs; i++) {
    int registerIndex = i / 8;
    int bitIndex = i % 8;
    bitClear(ledStates[registerIndex], bitIndex);
  }

  // Update the shift registers with the new LED states
  updateShiftRegisters();

  // Wait for 1 second before updating the LEDs again
  delay(100);
}

/**
 * Update the shift registers with the current LED states.
 */
void updateShiftRegisters() {
  // Latch the data to the outputs of the shift registers
  digitalWrite(latchPin, LOW);

  // Shift out the LED states to the shift registers
  for (int i = numRegisters - 1; i >= 0; i--) {
    shiftOut(dataPin, clockPin, MSBFIRST, ledStates[i]);
  }

  // Latch the data to the outputs of the shift registers
  digitalWrite(latchPin, HIGH);
}