#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd1(0x27, 20, 4);  // Alamat I2C untuk LCD1 20x4
LiquidCrystal_I2C lcd2(0x26, 20, 4);  // Alamat I2C untuk LCD2 20x4

// Pin untuk switch dan LED
const int switch_pin[] = {9,8,7,6};  
const int led_pin_OR[] = {5,4,3,2};     
const int led_pin_XOR[] = {13,12,11,10};     

// Variabel pembanding_OR (misal: 3 -> 0011)
byte pembanding_OR = B0011;

// Variabel pembanding_XOR (misal: 3 -> 0011)
byte pembanding_XOR = B0011;

int last_val1 = HIGH;
int last_val2 = HIGH;
int last_val3 = HIGH;
int last_val4 = HIGH;

void setup() {
  //OR GATE
  // Inisialisasi LCD1
  lcd1.init();
  lcd1.backlight();

  // Inisialisasi switch sebagai input
  for (int i = 0; i < 4; i++) {
    pinMode(switch_pin[i], INPUT_PULLUP);
  }
  
  // Inisialisasi LED OR sebagai output
  for (int i = 0; i < 4; i++) {
    pinMode(led_pin_OR[i], OUTPUT);
  }

 //------------------------------------------------------------------
  //XOR GATE
  lcd2.init();
  lcd2.backlight();
  
  // Inisialisasi LED XOR sebagai output
  for (int i = 0; i < 4; i++) {
    pinMode(led_pin_XOR[i], OUTPUT);
  }

  lcd1.setCursor(4,0);
  lcd1.print("Ubah Switch");
  lcd1.setCursor(1,1);
  lcd1.print("Untuk Mengaktifkan");
  lcd2.setCursor(4,0);
  lcd2.print("Ubah Switch");
  lcd2.setCursor(1,1);
  lcd2.print("Untuk Mengaktifkan");
}

void loop() {
  int value1 = digitalRead(switch_pin[0]);
  int value2 = digitalRead(switch_pin[1]);
  int value3 = digitalRead(switch_pin[2]);
  int value4 = digitalRead(switch_pin[3]);

  if(last_val1 != value1||last_val2 != value2||
  last_val3 != value3||last_val4 != value4)
  {
    last_val1 = value1;
    last_val2 = value2;
    last_val3 = value3;
    last_val4 = value4;
   
  // Membaca status switch dan mengaktifkan LED sesuai dengan operasi OR
  byte switch_status_OR = 0;

  for (int i = 0; i < 4; i++) {
    if (digitalRead(switch_pin[i]) == LOW) {
      switch_status_OR |= (1 << i);
    }
  }
  //Proses OR GATE
  byte hasil_OR = switch_status_OR | pembanding_OR;

  // Menyalakan atau mematikan LED sesuai dengan hasil OR
  for (int i = 0; i < 4; i++) {
    digitalWrite(led_pin_OR[i], (hasil_OR & (1 << i)) ? HIGH : LOW);
  }

  // Menampilkan status switch dan LED di LCD1
  lcd1.clear();
  lcd1.setCursor(0, 0);
  lcd1.print("OR GATE");
  lcd1.setCursor(0, 1);
  lcd1.print("Switch: ");
  lcd1.print(switch_status_OR, BIN);
  lcd1.setCursor(0, 2);
  lcd1.print("Pembanding OR: ");
  lcd1.print(pembanding_OR, BIN);
  lcd1.setCursor(0, 3);
  lcd1.print("OR: ");
  lcd1.print(hasil_OR, BIN);

//-----------------------------------------------------------------------
  // Membaca status switch dan mengaktifkan LED sesuai dengan operasi XOR
  byte switch_status_XOR = 0;

  for (int i = 0; i < 4; i++) {
    if (digitalRead(switch_pin[i]) == LOW) {
      switch_status_XOR |= (1 << i);
    }
  }
  //Proses XOR GATE
  byte hasil_XOR = switch_status_XOR ^ pembanding_XOR;

  // Menyalakan atau mematikan LED sesuai dengan hasil XOR
  for (int i = 0; i < 4; i++) {
    digitalWrite(led_pin_XOR[i], (hasil_XOR & (1 << i)) ? HIGH : LOW);
  }

  // Menampilkan status switch dan LED di LCD2
  lcd2.clear();
  lcd2.setCursor(0,0);
  lcd2.print("XOR GATE");
  lcd2.setCursor(0, 1);
  lcd2.print("Switch: ");
  lcd2.print(switch_status_XOR, BIN);
  lcd2.setCursor(0, 2);
  lcd2.print("Pembanding XOR: ");
  lcd2.print(pembanding_XOR, BIN);
  lcd2.setCursor(0, 3);
  lcd2.print("XOR: ");
  lcd2.print(hasil_XOR, BIN);
 
  }  // Tampilkan data selama 200ms
}