Lesson 99: Real-Time Cloick DS3231 to build LCD and LED Clock

Please select other codes for this lecture from the links below.

Related or required files and link to this lesson

Part 13: Clock and Timers

This code (99-6) is part of a lesson on Usiung DS3231 RTC clock module to using the Alarm features with Arduino. Using this code we can create unlimited Alarms. We've used a push button to reset the alarm when the alrm is triggered. Please watch video for full details.

00:00 Introduction
04:11 DS3231 Datasheet
05:07 DS3231 Wiring
06:38 Simple DS3231 Clock code and library
10:05 DS3231 Code using Alarm
14:07 Running DS3231 Clock code demonstration
17:49 Alarm Buzzer and LED wiring for DS3231, code and demo
22:21 LCD Clock using DS3231
23:57 LCD Clock Code for Arduino
28:43 Building Unlimited Alarm using DS3231 clock module
29:38 Unlimited alarm wiring diagram
31:29 DS3231 using Alarm with relay and AC bulb wiring
31:59 DS3231 Unlimited Alarm Arduino code
34:38 Demonstration of Unlimited Alarm with reset push button
35:40 LED Clock using DS3231 and HT16K33
38:45 LED Clock code explained
50:38 LED Clock Demonstration and settings


 /*
 * Lesson 99: LCD Clock using Arudino and DS3231 RTC module
 * Full video details: https://youtu.be/LEQfzmO9Wm0
 * In this lesson we have the following codes:
 * -Basic DS3231 to display on serial monitor
 * -Using Larm feature of the DS3231
 * -LCD Clock
 * -4 Digit LED Clock
 * -Unlimited Alarms using DS3231 with reset push button
 * 
 * 
 * This code is part of Arduino Step by Step Course which starts here:  https://youtu.be/-6qSrDUA5a8
 * 
 * for library of this code visit http://robojax.com/
 * 
If you found this tutorial helpful, please support me so I can continue creating 
content like this. Make a donation using PayPal by credit card https://bit.ly/donate-robojax
  
 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

 * 
 */
#include <DS3231.h>

DS3231 clock;
RTCDateTime robojax;

char daysOfTheWeek[7][12] = {
        "Sunday", "Monday", "Tuesday", 
        "Wednesday", "Thursday", "Friday", "Saturday"};
char monthName[12][12] = {
        "January", "February", "March", 
        "April", "May", "June",
        "July", "August", "September",
        "October", "November", "December"                
      };
        
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3f, 16, 2);


void setup () {
 // Robojax Course Lesson 99 video: https://youtu.be/LEQfzmO9Wm0
  while (!Serial); // for Leonardo/Micro/Zero

  Serial.begin(9600);
    // Initialize DS3231
  Serial.println("Initialize DS3231");;
  clock.begin();
  // Set sketch compiling time
  clock.setDateTime(__DATE__, __TIME__);   

  //set manual time 
  //clock.setDateTime(2014, 4, 13, 19, 21, 00);  
  // initialize the LCD
  lcd.begin();

  // Turn on the blacklight and print a message.
  lcd.backlight();
  lcd.print("Robojax");   
  lcd.setCursor (0,1); // go to start of 2nd line  
   lcd.print("DS3231  Clock");
}

void loop () {
   robojax = clock.getDateTime();
    // Robojax Course Lesson 99 video: https://youtu.be/LEQfzmO9Wm0
   lcd.clear();
   lcd.setCursor (0,0);  
      lcd.print(robojax.day);  
      lcd.print(" ");      
      lcd.print(monthName[robojax.month-1]);  
      lcd.print(" ");                                                
      lcd.print(robojax.year);




    lcd.setCursor (0,1); // go to start of 2nd line
      lcd.print(robojax.hour);
      lcd.print(":");
      lcd.print(robojax.minute);
      lcd.print(":");
      lcd.print(robojax.second);
      lcd.print(" ");        
      lcd.print(daysOfTheWeek[robojax.dayOfWeek]);      

  delay(300);
 // Robojax Course Lesson 99 video: https://youtu.be/LEQfzmO9Wm0  
}