#include <Arduino.h>
#include <ShiftRegister74HC595.h>

const int dataPin = 5;   // DS ke 74HC595
const int clockPin = 19; // SHCP ke 74HC595
const int latchPin = 18; // STCP ke 74HC595

const int PL_pin = 26;   // PL (SH/LD) dari 74HC165 -> GPIO26
const int CP_pin = 13;   // CP (Clock) dari 74HC165 -> GPIO13
const int Q7_pin = 25;   // Q7 (Serial Out) dari 74HC165 -> GPIO25

ShiftRegister74HC595<4> sr(dataPin, clockPin, latchPin);

void setup() {
  pinMode(PL_pin, OUTPUT);
  pinMode(CP_pin, OUTPUT);
  pinMode(Q7_pin, INPUT);

  digitalWrite(PL_pin, HIGH); // default HIGH (mode shift)
  digitalWrite(CP_pin, LOW);  // default LOW
}

void loop() {
  // Load data paralel dari input ke register
  digitalWrite(PL_pin, LOW);
  delayMicroseconds(5);
  digitalWrite(PL_pin, HIGH);

  // Baca 32 bit dari 74HC165
  for (int x = 31; x >= 0; x--) {
    // Shift satu bit
    digitalWrite(CP_pin, LOW);
    digitalWrite(CP_pin, HIGH);

    // Simpan ke 74HC595
    sr.set(x, digitalRead(Q7_pin));
  }

  delay(100);
}