#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27, 16, 2);
unsigned long tAwal, tSaatini, dataSW;
unsigned long tAwal2, tSaatini2, dataSW2;
bool count = false;
bool count2 = false;

void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(2, 0);
  lcd.print("Tekan Tombol");
  lcd.setCursor(2, 1);
  lcd.print("Start / Stop");
  delay(1000);
  lcd.clear();

}

void loop() {
  if (digitalRead(2) == 0) {
    tAwal = millis() - dataSW;
    count = true;
       lcd.setCursor(0, 0);
    lcd.print("STR1");
  }
  else if (digitalRead(3) == 0) {
    count = false;
    lcd.setCursor(0, 0);
    lcd.print("STP1");
    
  }
  else if (digitalRead(4) == 0){
  tAwal2 = millis() - dataSW2;
    count2 = true;
    lcd.setCursor(0, 1);
    lcd.print("STR2");
    
  }
  else if (digitalRead(5) == 0) {
    count2 = false;
    lcd.setCursor(0, 1);
    lcd.print("STP2");
    
  }
  else if (digitalRead(6) == 0) {
    count = false;
    count2 = false;
    dataSW = 0;
    dataSW2 = 0;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Reset Stopwatch");
    lcd.setCursor(4, 1);
    lcd.print("0:0:0:0");
    delay(1000);
    lcd.clear();
    lcd.setCursor(2, 0);
    lcd.print("Tekan Tombol");
    lcd.setCursor(2, 1);
    lcd.print("Start / Stop");
    delay(1000);
    lcd.clear();
  }
  if (count) {
    tSaatini = millis();
    dataSW = tSaatini - tAwal;
    float jam, mnt, dtk, ms;
    unsigned long over;

    jam = int(dataSW / 3600000);
    over = dataSW % 3600000;
    mnt = int(over / 60000);
    over = over % 60000;
    dtk = int(over / 1000);
    ms = over % 1000;
    lcd.setCursor(5, 0);
    lcd.print(jam, 0);
    lcd.print(":");
    lcd.print(mnt, 0);
    lcd.print(":");
    lcd.print(dtk, 0);
    lcd.print(":");
    lcd.print(ms, 0);
    lcd.print("  ");



  }
  if (count2) {
    tSaatini2 = millis();
    dataSW2 = tSaatini2 - tAwal2;
    float jam2, mnt2, dtk2, ms2;
    unsigned long over2;

    jam2 = int(dataSW2 / 3600000);
    over2 = dataSW2 % 3600000;
    mnt2 = int(over2 / 60000);
    over2 = over2 % 60000;
    dtk2 = int(over2 / 1000);
    ms2 = over2 % 1000;
    lcd.setCursor(5, 1);
    lcd.print(jam2, 0);
    lcd.print(":");
    lcd.print(mnt2, 0);
    lcd.print(":");
    lcd.print(dtk2, 0);
    lcd.print(":");
    lcd.print(ms2, 0);
    lcd.print("  ");



  }
}