// Pin definitions
int datapin = 2;  // DS (data pin)
int clockpin = 3; // SHCP (shift clock pin)
int latchpin = 4; // STCP (latch pin)

// Create an array to hold the data for all 10 shift registers
byte shiftRegisterData[10] = {0};

void setup() {
  pinMode(datapin, OUTPUT);
  pinMode(clockpin, OUTPUT);
  pinMode(latchpin, OUTPUT);
}

void loop() {
  // Example: Turn on one LED at a time across all 80 outputs
  for (int i = 0; i < 80; i++) {
    clearShiftRegisters();         // Clear all outputs
    setShiftRegister(i, HIGH);     // Set the specific LED ON
    updateShiftRegisters();        // Send data to the shift registers
    delay(100);                    // Pause for visibility
  }
}

// Clear all shift register outputs
void clearShiftRegisters() {
  for (int i = 0; i < 10; i++) {
    shiftRegisterData[i] = 0;
  }
}

// Set a specific output HIGH or LOW
void setShiftRegister(int output, boolean state) {
  int registerIndex = output / 8;  // Determine which register (0-9)
  int bitIndex = output % 8;      // Determine which bit within the register (0-7)
  bitWrite(shiftRegisterData[registerIndex], bitIndex, state);
}

// Update the shift registers with the current data
void updateShiftRegisters() {
  digitalWrite(latchpin, LOW);     // Prepare to send data
  for (int i = 9; i >= 0; i--) {   // Send data to all 10 registers
    shiftOut(datapin, clockpin, MSBFIRST, shiftRegisterData[i]);
  }
  digitalWrite(latchpin, HIGH);    // Latch to display the new data
}