Membuat StopWatch Sendiri menggunakan Arduino Uno dan LCD 16x2

Kebutuhan Hardware :
1. Arduino Uno
2. Module I2C LCD 16x2
3. LCD 16x2
4. Tact Switch
Berikut ini adalah Schematicnya


Setelah terkoneksi dengan baik silahkan upload Sketch dibawah ini :

/***************************
StopWatch LCD 16x2

Oleh : Workshop Electronics 3 in 1
Website : www.arduinoindonesia.id
Toko Online : www.workshopelectronics3in1.com
Blog : www.edukasielektronika.com
Profil : www.workshopelectronics3in1.co.id

Copyright @2017
****************************/

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

LiquidCrystal_I2C lcd(0x3F ,2,1,0,4,5,6,7,3, POSITIVE);

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

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

  lcd.setCursor(0, 0);
  lcd.print("ArduinoIndonesia");
  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() - 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 / 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("   ");
       }
   }
}