// Shift register pins for 74HC595
const int latchPin1 = 6;  // Latch pin (ST_CP)
const int clockPin1 = 7;  // Clock pin (SH_CP)
const int dataPin1 = 8;   // Data pin (DS)

byte myData = B00100100;  // Binary literal (equals 0x24 or 36 in decimal)
byte dataArray[] = {B00100100, B11000011, B00001111}; // Binary values

void setup() {
  // Set pins as outputs
  pinMode(latchPin1, OUTPUT);
  pinMode(clockPin1, OUTPUT);
  pinMode(dataPin1, OUTPUT);

  // Send data once at startup
  digitalWrite(latchPin1, LOW);
  shiftOut(dataPin1, clockPin1, MSBFIRST, myData); // Send 00100100
  digitalWrite(latchPin1, HIGH);
  delay(2000);
}

void loop() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(latchPin1, LOW);
    shiftOut(dataPin1, clockPin1, MSBFIRST, dataArray[i]);
    digitalWrite(latchPin1, HIGH);
    delay(2000);
  }
}