const int dataPin = 4;   // QH
const int clockPin = 5;  // CP
const int loadPin = 6;   // PL

const int LOAD_PIN  = 6;   // PL: Parallel Load (active LOW)
const int CLOCK_PIN = 5;   // CP: Clock (rising edge shifts data)
const int DATA_PIN  = 4;  // QH: Serial data from last 74HC165
const int CLK_EN_PIN = 11; // CE: Clock Enable (active LOW)

const int NUM_CHIPS = 5;
const int TOTAL_BITS = NUM_CHIPS * 8;

void setup() {
  Serial.begin(9600);

  pinMode(LOAD_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(CLK_EN_PIN, OUTPUT);
  pinMode(DATA_PIN, INPUT);

  digitalWrite(CLOCK_PIN, LOW);
  digitalWrite(CLK_EN_PIN, LOW);  // Enable shifting
  digitalWrite(LOAD_PIN, HIGH);   // Start unlatched
}

void loop() {
  // Trigger parallel load
  digitalWrite(LOAD_PIN, LOW);
  delayMicroseconds(5);           // Small delay to latch data
  digitalWrite(LOAD_PIN, HIGH);

  // Read each bit
  Serial.print("Bits: ");
  for (int i = 0; i < TOTAL_BITS; i++) {
    int bitVal = digitalRead(DATA_PIN);
    Serial.print(bitVal);
    
    // Shift to next bit
    digitalWrite(CLOCK_PIN, HIGH);
    delayMicroseconds(1);  // Short delay for clock pulse
    digitalWrite(CLOCK_PIN, LOW);
  }
  Serial.println();
  delay(500); // Read every half second
}