#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define bUP 4
#define bOK 3
#define bDN 2
#define BOUNCE 50

// Inisialisasi LCD I2C (alamat default biasanya 0x27, sesuaikan jika berbeda)
LiquidCrystal_I2C lcd(0x27, 20, 4);

const int flowSensorPin = 5;  // Pin yang terhubung dengan output sensor flow meter
volatile int pulseCount = 0;
float flowRate = 0.0;          // Debit air dalam liter per menit
float totalVolume = 0.0;       // Total volume air dalam liter
unsigned long oldTime = 0;

// Kalibrasi sensor flow meter (contoh: 4.5 pulse per detik per liter per menit)
const float calibrationFactor = 4.5;

void setup() {
  lcd.begin(20, 4);
  lcd.init();
  lcd.backlight();

  // Inisialisasi pin sensor flow meter
  pinMode(flowSensorPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(flowSensorPin), pulseCounter, FALLING);

  pinMode(bUP, INPUT_PULLUP);
  pinMode(bOK, INPUT_PULLUP);
  pinMode(bDN, INPUT_PULLUP);

  // Inisialisasi serial monitor (opsional)
  Serial.begin(9600);
}

void loop() {

  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    menuSetting();
  }

  lcd.setCursor(0, 0);
  lcd.print("  FLOW WATER METER  ");
  lcd.setCursor(0, 1);
  lcd.print(" DEMINT WATER PLANT ");
  lcd.setCursor(0, 2);
  lcd.print("   **************   ");
  lcd.setCursor(0, 3);
  lcd.print("   >>>TEKAN OK<<<   ");
}

void menuSetting() {
//menu
  //---------------------------------------------
setMENU1:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setSUBMENU1;
  }else if(digitalRead(bUP) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bUP) == LOW) {}
    lcd.clear();
    goto setEXIT;
  }else if(digitalRead(bDN) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bDN) == LOW) {}
    lcd.clear();
    goto setMENU2;
  }
  lcd.setCursor(0, 0);
  lcd.print("->MENU 1     EXIT   ");
  lcd.setCursor(0, 1);
  lcd.print("  MENU 2  ");
  lcd.setCursor(0, 2);
  lcd.print("  MENU 3  ");
  lcd.setCursor(0, 3);
  lcd.print("  MENU 4  ");
  goto setMENU1;
  //-------------------------------------------
setMENU2:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setSUBMENU2;
  }else if(digitalRead(bUP) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bUP) == LOW) {}
    lcd.clear();
    goto setMENU1;
  }else if(digitalRead(bDN) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bDN) == LOW) {}
    lcd.clear();
    goto setMENU3;
  }
  lcd.setCursor(0, 0);
  lcd.print("  MENU 1     EXIT   ");
  lcd.setCursor(0, 1);
  lcd.print("->MENU 2  ");
  lcd.setCursor(0, 2);
  lcd.print("  MENU 3  ");
  lcd.setCursor(0, 3);
  lcd.print("  MENU 4  ");
  goto setMENU2;
  //-------------------------------------------
setMENU3:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setSUBMENU3;
  }else if(digitalRead(bUP) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bUP) == LOW) {}
    lcd.clear();
    goto setMENU2;
  }else if(digitalRead(bDN) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bDN) == LOW) {}
    lcd.clear();
    goto setMENU4;
  }
  lcd.setCursor(0, 0);
  lcd.print("  MENU 1     EXIT   ");
  lcd.setCursor(0, 1);
  lcd.print("  MENU 2  ");
  lcd.setCursor(0, 2);
  lcd.print("->MENU 3  ");
  lcd.setCursor(0, 3);
  lcd.print("  MENU 4  ");
  goto setMENU3;
  //-------------------------------------------
setMENU4:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setSUBMENU4;
  }else if(digitalRead(bUP) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bUP) == LOW) {}
    lcd.clear();
    goto setMENU3;
  }else if(digitalRead(bDN) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bDN) == LOW) {}
    lcd.clear();
    goto setEXIT;
  }
  lcd.setCursor(0, 0);
  lcd.print("  MENU 1     EXIT   ");
  lcd.setCursor(0, 1);
  lcd.print("  MENU 2  ");
  lcd.setCursor(0, 2);
  lcd.print("  MENU 3  ");
  lcd.setCursor(0, 3);
  lcd.print("->MENU 4  ");
  goto setMENU4;
  //---------------------------------------
setEXIT:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto endSET;
  }else if(digitalRead(bUP) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bUP) == LOW) {}
    lcd.clear();
    goto setMENU4;
  }else if(digitalRead(bDN) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bDN) == LOW) {}
    lcd.clear();
    goto setMENU1;
  }
  lcd.setCursor(0, 0);
  lcd.print("  MENU 1   ->EXIT   ");
  lcd.setCursor(0, 1);
  lcd.print("  MENU 2  ");
  lcd.setCursor(0, 2);
  lcd.print("  MENU 3  ");
  lcd.setCursor(0, 3);
  lcd.print("  MENU 4  ");
  goto setEXIT;
  //---------------------------------------
//SUBMENU
setSUBMENU1:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setMENU1;
  }
  // Hitung waktu berlalu
  unsigned long currentTime = millis();
  unsigned long elapsedTime = currentTime - oldTime;

  // Setiap 1 detik (1000 ms)
  if (elapsedTime >= 1000) {
    // Hitung flow rate (liter per menit)
    flowRate = ((1000.0 / elapsedTime) * pulseCount) / calibrationFactor;

    // Tambahkan volume total (liter)
    totalVolume += (flowRate / 60.0);

    // Reset counter dan waktu
    pulseCount = 0;
    oldTime = currentTime;

    // Update tampilan LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(" Flow Water Meter 1 ");
    lcd.setCursor(0, 1);
    lcd.print("Flow Rate: ");
    lcd.print(flowRate);
    lcd.print("L/min");
    lcd.setCursor(0, 2);
    lcd.print("Totalizer: ");
    lcd.print(totalVolume);
    lcd.print(" L");
  }
  goto setSUBMENU1;
  //----------------------------------------
setSUBMENU2:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setMENU2;
  }
  lcd.setCursor(0, 0);
  lcd.print("  sub menu2  ");
  goto setSUBMENU2;
  //-----------------------------------------
setSUBMENU3:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setMENU3;
  }
  lcd.setCursor(0, 0);
  lcd.print("  sub menu3  ");
  goto setSUBMENU3;
  //----------------------------------------
setSUBMENU4:
  if(digitalRead(bOK) == LOW) {
    delay(BOUNCE);
    while (digitalRead(bOK) == LOW) {}
    lcd.clear();
    goto setMENU4;
  }
  lcd.setCursor(0, 0);
  lcd.print("  sub menu4  ");
  goto setSUBMENU4;
  //-------------------------------------------
endSET:
lcd.clear();
delay(100);
}

void pulseCounter() {
  // Fungsi interrupt untuk menghitung pulse dari sensor flow meter
  pulseCount++;
}