JAMduino (Arduino Clock without RTC)

JAMduino (Arduino Clock without RTC) is a simple Arduino clock project using Arduino Uno & LCD Keypad Shield, without RTC module (Real Time Clock). Watch the video below (click here) to see its action, then follow the instructions below to build your own JAMduino!

1. What You Need 🎁

To build this project, you need the following items:

• 1 Arduino Uno board
• 1 LCD Keypad Shield
• Arduino IDE (download here)
• LCD Keypad library (I've attached its .rar on this repo)

2. Schematics 🔧🔨

Just plug the LCD Keypad Shield on top of Arduino Uno board.

3. Sketch 📋

• First, extract LCD Keypad library (LCDKeypad.rar) then copy it to C:\...\Documents\Arduino\libraries.

• Open Arduino IDE then copy sketch below. Make sure you have chosen the right option for Board and Port under Tools menu, then upload to your Arduino board.

  #include <LiquidCrystal.h>
  #include "LCDKeypad.h"
  
  #define DAYS 0
  #define HOURS 1
  #define MINUTES 2
  #define SECONDS 3
  LCDKeypad lcd;
  
  unsigned int days = 0;
  unsigned int hours = 0;
  unsigned int minutes = 0;
  unsigned int seconds = 0;
  unsigned int setting = 0;
  
  void setup() { 
      lcd.begin(16,2);
      lcd.setCursor(4, 0);
      lcd.print("JamDUINO");
      lcd.setCursor(0, 1); 
      lcd.print("tanpa modul RTC");
      delay(3500);
      lcd.clear();
      
      lcd.setCursor(0,0);
      lcd.print("Lintang Wisesa");
      lcd.setCursor(1,1);
      lcd.print("simpLINnovation");
      delay(3500);
      lcd.clear();
      
      lcd.setCursor(0,0);
      lcd.print(" Setting: Hari  "); // "Hari" means "Day"
  }
  
  void loop() {
      incTime();
      printTime();
      buttonListen();
  }
  
  void buttonListen() {
      for (int i = 0; i < 5; i++) {
          int button = lcd.button();
          switch (button) {
  
          case KEYPAD_RIGHT:
          setting++;
          break;
  
          case KEYPAD_LEFT:
          setting--;
          break;
  
          case KEYPAD_UP:
          switch (setting) {
          case DAYS:
              days++;
              if (days == 7) days = 0;
              if (days == 0)
              lcd.setCursor(0,1);
              lcd.print("SENIN ");  // "Senin" means "Monday"
              if (days == 1)
              lcd.setCursor(0,1);
              lcd.print("SELASA");  // "Selasa" means "Tuesday"
              if (days == 2)
              lcd.setCursor(0,1);
              lcd.print("RABU  ");  // "Rabu" means "Wednesday"
              if (days == 3)
              lcd.setCursor(0,1);
              lcd.print("KAMIS ");  // "Kamis" means "Thursday"
              if (days == 4)
              lcd.setCursor(0,1);
              lcd.print("JUMAT ");  // "Jumat" means "Friday"
              if (days == 5)
              lcd.setCursor(0,1);
              lcd.print("SABTU ");  // "Sabtu" means "Saturday"
              if (days == 6)
              lcd.setCursor(0,1);
              lcd.print("AHAD  ");  // "Ahad" means "Sunday"
              break;
          case HOURS:
              hours++;
              break;
          case MINUTES:
              minutes++;
              break;
          case SECONDS:
              seconds++;
          }     
          break;
  
          case KEYPAD_DOWN:
          switch (setting) {
          case DAYS:
              days--;
              if (days == -1) days = 6;
              if (days == 0)
              lcd.setCursor(0,1);
              lcd.print("SENIN ");
              if (days == 1)
              lcd.setCursor(0,1);
              lcd.print("SELASA");
              if (days == 2)
              lcd.setCursor(0,1);
              lcd.print("RABU  ");
              if (days == 3)
              lcd.setCursor(0,1);
              lcd.print("KAMIS ");
              if (days == 4)
              lcd.setCursor(0,1);
              lcd.print("JUMAT ");
              if (days == 5)
              lcd.setCursor(0,1);
              lcd.print("SABTU ");
              if (days == 6)
              lcd.setCursor(0,1);
              lcd.print("AHAD  ");
              break;
          case HOURS:
              hours--;
              if (hours == -1) hours = 23;
              break;
          case MINUTES:
              minutes--;
              if (minutes == -1) minutes = 59;
              break;
          case SECONDS:
              seconds--;
              if (seconds == -1) seconds = 59;
          }
      }
  
      setting %= 4;
      printSetting();
      
      days %= 7;
      hours %= 24;
      minutes %= 60;
      seconds %= 60;
      printTime();
  
      while(millis() % 200 != 0);
      }
  }
  
  
  void printSetting() {
      lcd.setCursor(0,0);
  
      switch (setting) {
      case DAYS:
          lcd.print("JamDUINO   Hari~");  // "Hari" means "Day"
          break;  
      case HOURS:
          lcd.print("JamDUINO    Jam~");  // "Jam" means "Hour"
          break;
      case MINUTES:
          lcd.print("JamDUINO  Menit~");  // "Menit" means "Minute"
          break;
      case SECONDS:
          lcd.print("JamDUINO  Detik~");  // "Detik" means "Second"
      }
  }
  
  void incTime() {
      
      seconds++;
  
      if (seconds == 60) {
          
          seconds = 0;
  
          minutes++;
  
          if (minutes == 60) {
          
          minutes = 0;
  
          hours++;
  
          if (hours == 24) {
              hours = 0;
  
              days++;
              if (days == 7) days = 0;
              if (days == 0)
              lcd.setCursor(0,1);
              lcd.print("SENIN ");
              if (days == 1)
              lcd.setCursor(0,1);
              lcd.print("SELASA");
              if (days == 2)
              lcd.setCursor(0,1);
              lcd.print("RABU  ");
              if (days == 3)
              lcd.setCursor(0,1);
              lcd.print("KAMIS ");
              if (days == 4)
              lcd.setCursor(0,1);
              lcd.print("JUMAT ");
              if (days == 5)
              lcd.setCursor(0,1);
              lcd.print("SABTU ");
              if (days == 6)
              lcd.setCursor(0,1);
              lcd.print("AHAD  ");
              }
          }
      }
  }
  
  void printTime() {
      lcd.setCursor(6,1);
      char time[17];
      sprintf(time, "  %02i:%02i:%02i", hours, minutes, seconds);
      lcd.print(time);
  }
  

4. Have Fun! 😎

• After uploading done, you have to set the time manually first.
• On LCD Keypad Shield, use:
  • Use ⬅️ left / right ➡️ button to choose time option: HARI (days), JAM (hours), MENIT (min) & DETIK (sec).
  • Use ⬆️ up / down ⬇️ button to set its time, then your clock is ready to go! Have fun!

Lintang Wisesa 💌 lintangwisesa@ymail.com

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