#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27, 12, 6);

unsigned long mulai, selesai, dataStopWatch;
int i=0;
int fPaus = 0;
long lastButton = 0;
long delayAntiBouncing = 50;
long dataPaus = 0;

void setup(){
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  delay(1000);

  pinMode(A0,INPUT);
  pinMode(A1,INPUT);
  digitalWrite(A0,1);
  digitalWrite(A1,1);
  lcd.begin(16, 2);

  lcd.setCursor(3,0);
  lcd.print("WELCOME...");
  delay(800);
  lcd.clear();
  delay(500);
  lcd.setCursor(0,0);
  lcd.print("Tuned By :");
  lcd.setCursor(0,1);
  lcd.print("RPM_378");
  delay(1000);
  lcd.clear();
  delay(500);
  lcd.setCursor(1, 0);
  lcd.print("Tekan Tombol");
  lcd.setCursor(1, 1);
  lcd.print("Start / Stop");
  for (i = 0 ; i < 16; i++) 
  {
    lcd.scrollDisplayRight(); 
    delay(200);
  } 
  for (i = 1 ; i < 16; i++) 
  {
    lcd.scrollDisplayLeft(); 
    delay(200);
  } 
  
}

void loop(){
if (digitalRead(A0)==0){
  if ((millis() - lastButton) > delayAntiBouncing){
      if (i==0){
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Start Timer");
          mulai = millis();
          fPaus = 0;
        }
       else if (i==1){
        lcd.setCursor(0, 0);
        lcd.print("Stop Timer  ");
        dataPaus = dataStopWatch;
        fPaus = 1;
        }
       i =!i;
      }
      lastButton = millis();
  }
 else if (digitalRead(A1)==0 && fPaus == 1){
  dataStopWatch = 0;
  dataPaus = 0;
  lcd.clear();
  lcd.print("Reset Stopwatch");
  lcd.setCursor(0, 1);
  lcd.print("0:0:0.0"); 
  delay(2000);
  lcd.clear();
  lcd.print("  Tekan Tombol");
  lcd.setCursor(0, 1);
  lcd.print("  Start / Stop");
 }
  if (i==1){
      selesai = millis();
      float jam, menit, detik, miliDetik;
      unsigned long over;

      // MATH time!!!
      dataStopWatch = selesai - mulai;
      dataStopWatch = dataPaus + dataStopWatch;

      jam = int(dataStopWatch / 360000);
      over = dataStopWatch % 360000;
      menit = int(over / 60000);
      over = over % 60000;
      detik = int(over / 1000);
      miliDetik = over % 1000;

      lcd.setCursor(0, 1);
      lcd.print(jam, 0);
      lcd.print(":");
      lcd.print(menit, 0);
      lcd.print(":");
      lcd.print(detik, 0);
      lcd.print(".");
      if (jam < 10){
          lcd.print(miliDetik, 0);
          lcd.print("   ");
       }
   }
}