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Lesson 105: Ultimate Arduino Clocks projects using DS1307

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

  • Lesson 19: Introduction to LCD screen
  • Lesson 25: Introduction to HT16K33 Seven Segment Display
  • Purchase LCD Screen from Amazon USA
  • Purchase LCD Screen from Amazon Canada
  • Purchase LCD Screen from all other Amazon
  • Part 13: Clock and Timers

    This in this lesson we have 7 projects in one. We learn how use DS1307 Real-Time Clock (RTC) module to build a clock using Arduino.

    This is project 1 Basic DS1307 Clock with Arduino where we build a clock which is displayed on the serial monotor of computer.

    Projects

    
     /*
     * Lesson 105-1: Building Clock using DS1307 | Robojax Arduino Step By Step Course
     This code:  Project 1: Basic DS1307 Clock with Arduino 
    In this lesson we learn how to use DS1307 Real-time clock module to build Arduino clock. In this lesson we learn about 7 projects. 
    
    Project 1: Basic DS1307 Clock with Arduino
    Project 2: DS1307 Alarm with Buzzer and Relay
    Project 3: DS1307 Alarm with Relay and AC Bulb
    Project 4: LED Seven Segment Clock using DS1307
    Project 5: Unlimited Alarm with Relay
    Project 6: LCD Clock using DS1307
    Project 7: LCD Clock with Alarm 
     * Watch Video instrution for this code:https://youtu.be/gz9xqvRroDY
     * 
     * 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/>.
    
    
    */
    /*
     * 
     * for library of this code visit http://robojax.com/
     * 
     */
    //DateTime (uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t min, uint8_t sec)
    
    #include <Wire.h>
    #include "RTClib.h"
    
    RTC_DS1307 rtc;
    const bool FORMAT_12=false;//if 12 hours set to true, for 24 hours set to false
    
    char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
    
    void setup () {
      while (!Serial); // for Leonardo/Micro/Zero
    
      Serial.begin(9600);
      if (! rtc.begin()) {
        Serial.println("Couldn't find RTC");
        while (1);
      }
    
      if (! rtc.isrunning()) {
        Serial.println("RTC is NOT running!");
        // following line sets the RTC to the date & time this sketch was compiled
        // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
        // This line sets the RTC with an explicit date & time, for example to set
        // January 21, 2014 at 3am you would call:
         //rtc.adjust(DateTime(2019, 3, 3, 20, 0, 0));
      }
      rtc.adjust(DateTime(2025, 3, 3, 20, 0, 0));
       //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    }
    
    void loop () {
        DateTime now = rtc.now();
        
        Serial.print(now.year(), DEC);
        Serial.print('/');
        Serial.print(now.month(), DEC);
        Serial.print('/');
        Serial.print(now.day(), DEC);
        Serial.print(" (");
        Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
        Serial.print(") ");
         if(FORMAT_12)
        {
         Serial.print(now.twelveHour(), DEC);//12 hours format       
        }else{
         Serial.print(now.hour(), DEC);//24 hour format     
        }    
        
        Serial.print(':');
        if(now.minute() <10)
        Serial.print(0);
        Serial.print(now.minute(), DEC);
        Serial.print(':');
        if(now.second() <10)
        Serial.print(0);    
        Serial.print(now.second(), DEC);
         if(FORMAT_12)
        {
          if(now.isPM())
          {
             Serial.print("PM");  
          }else{
              Serial.print("AM");        
          }
        }    
        Serial.println();
       
        delay(3000);
    }
    
       

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