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

// Inisialisasi LCD I2C 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Inisialisasi Keypad 4x4
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
    {'4','5','6','B'},
      {'7','8','9','C'},
        {'*','0','#','D'}
        };
        byte rowPins[ROWS] = {9, 8, 7, 6};
        byte colPins[COLS] = {5, 4, 3, 2};
        Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

        // Deklarasi variabel
        int setCount = 0;
        int count = 0;
        unsigned long lastPressTime = 0;
        bool beep = false;
        bool resetSetCount = false;
        bool irLastState = HIGH; // Menyimpan status terakhir dari sensor IR
        bool beepActive = true;

        // Pin sensor IR dan speaker
        const int irSensorPin = A0;
        const int speakerPin = 10;

        // Fungsi setup
        void setup() {
          pinMode(irSensorPin, INPUT);
            pinMode(speakerPin, OUTPUT);
              lcd.begin(16, 2); // Mengatur jumlah kolom dan baris pada LCD
                lcd.backlight();
                  lcd.setCursor(0, 0);
                    lcd.print("Set Count= ");
                      lcd.setCursor(0, 1);
                        lcd.print("Count= ");
                        }

                        // Fungsi loop
                        void loop() {
                          char key = keypad.getKey();
                            
                              if (key) {
                                  if (key >= '0' && key <= '9') {
                                        if (resetSetCount) {
                                                setCount = 0;
                                                        resetSetCount = false;
                                                              }
                                                                    setCount = (setCount * 10) + (key - '0');
                                                                          updateLCD();
                                                                              }
                                                                                  if (key == 'C') {
                                                                                        unsigned long currentTime = millis();
                                                                                              if (currentTime - lastPressTime < 5000) {
                                                                                                      setCount = 0;
                                                                                                            } else {
                                                                                                                    lastPressTime = currentTime;
                                                                                                                          }
                                                                                                                                updateLCD();
                                                                                                                                    }
                                                                                                                                        if (key == 'D') {
                                                                                                                                              // Set nilai setCount
                                                                                                                                                    updateLCD();
                                                                                                                                                        }
                                                                                                                                                            if (key == 'A') {
                                                                                                                                                                  unsigned long currentTime = millis();
                                                                                                                                                                        if (currentTime - lastPressTime > 5000) {
                                                                                                                                                                                count = 0;
                                                                                                                                                                                      } else {
                                                                                                                                                                                              lastPressTime = currentTime;
                                                                                                                                                                                                    }
                                                                                                                                                                                                          updateLCD();
                                                                                                                                                                                                              }
                                                                                                                                                                                                                  if (key == 'B') {
                                                                                                                                                                                                                        // Pulihkan nilai count
                                                                                                                                                                                                                              count = setCount;
                                                                                                                                                                                                                                    updateLCD();
                                                                                                                                                                                                                                        }
                                                                                                                                                                                                                                            if (key == '*') {
                                                                                                                                                                                                                                                  // Reset nilai setCount tanpa mengatur ulang nilai count
                                                                                                                                                                                                                                                        resetSetCount = true;
                                                                                                                                                                                                                                                            }
                                                                                                                                                                                                                                                                if (key == '#') {
                                                                                                                                                                                                                                                                      beepActive = false;
                                                                                                                                                                                                                                                                            noTone(speakerPin);
                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                  }

                                                                                                                                                                                                                                                                                    bool irValue = digitalRead(irSensorPin);
                                                                                                                                                                                                                                                                                      if (irValue == LOW && irLastState == HIGH) {
                                                                                                                                                                                                                                                                                          delay(100); // Debounce sensor IR
                                                                                                                                                                                                                                                                                              if (digitalRead(irSensorPin) == LOW) {
                                                                                                                                                                                                                                                                                                    count++;
                                                                                                                                                                                                                                                                                                          tone(speakerPin, 1000, 100);
                                                                                                                                                                                                                                                                                                                updateLCD();
                                                                                                                                                                                                                                                                                                                      delay(500); // Berikan jeda agar tidak menghitung dua kali
                                                                                                                                                                                                                                                                                                                          }
                                                                                                                                                                                                                                                                                                                            }
                                                                                                                                                                                                                                                                                                                              irLastState = irValue;

                                                                                                                                                                                                                                                                                                                                if (count >= setCount && beepActive) {
                                                                                                                                                                                                                                                                                                                                    if (!beep) {
                                                                                                                                                                                                                                                                                                                                          tone(speakerPin, 1000); // Mulai bunyi bip
                                                                                                                                                                                                                                                                                                                                                beep = true;
                                                                                                                                                                                                                                                                                                                                                    }
                                                                                                                                                                                                                                                                                                                                                      } else {
                                                                                                                                                                                                                                                                                                                                                          noTone(speakerPin);
                                                                                                                                                                                                                                                                                                                                                              beep = false;
                                                                                                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                                                                                                }

                                                                                                                                                                                                                                                                                                                                                                // Fungsi untuk memperbarui tampilan LCD
                                                                                                                                                                                                                                                                                                                                                                void updateLCD() {
                                                                                                                                                                                                                                                                                                                                                                  lcd.setCursor(11, 0);
                                                                                                                                                                                                                                                                                                                                                                    lcd.print("       ");
                                                                                                                                                                                                                                                                                                                                                                      lcd.setCursor(11, 0);
                                                                                                                                                                                                                                                                                                                                                                        lcd.print(setCount);
                                                                                                                                                                                                                                                                                                                                                                          lcd.setCursor(7, 1);
                                                                                                                                                                                                                                                                                                                                                                            lcd.print("       ");
                                                                                                                                                                                                                                                                                                                                                                              lcd.setCursor(7, 1);
                                                                                                                                                                                                                                                                                                                                                                                lcd.print(count);
                                                                                                                                                                                                                                                                                                                                                                                }