// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
long mulai, selesai, dataStopWatch;
int i=0;
int fpause = 0;
long lasttombol =0;
long delayantibouncing =50;
long datapause = 0;

void setup() {
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);
  digitalWrite(A0, HIGH);
  digitalWrite(A1, HIGH);
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  lcd.print(" ARDUINO");
  lcd.setCursor(0,1);
  lcd.print(" STOPWATCH");
  delay(2000);
  lcd.clear();
  lcd.print("TEKAN TOMBOL");
  lcd.setCursor(0,1);
  lcd.print("START/STOP");
}

void loop() {
  if (digitalRead(A0)==0){
    if((millis() - lasttombol)>delayantibouncing) {
      if (i==0){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("Start Timer");
        mulai = millis();
        fpause=0;
      }
       else if (i==1){
          lcd.setCursor(0,0);
          lcd.print("Stop Timer");
          datapause = dataStopWatch;
          fpause = 0;
        }
        i=!i;
      }
     lasttombol = millis();
    }
     else if(digitalRead(A1)==0 && fpause == 1){
       dataStopWatch = 0;
       datapause = 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;
      long over;

      dataStopWatch = selesai - mulai;
      dataStopWatch = datapause + dataStopWatch;

      jam = int (dataStopWatch / 3600000);
      over = dataStopWatch % 3600000;
      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("");
      }
  }
}