Home Main Arduino Code Arduino Step by Step Course SunFounder's ESP32 Course

Back to Step by Step Course by Robojax

Lesson 105: Ultimate Arduino Clocks projects using DS1307

If you don't like to see ads while video is being played you can purchase YouTube premium Here

Lesson 105: Ultimate Arduino Clocks projects using DS1307

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 5 Unlimited Alarm with Relay. This code is to have unlimited alarm so you can control multiple devices at different times. We defined an output pin for each alarm to turn it ON or OFF using each alarm. Each alarm can have title to identify them and it will be printed on the serial monitor.

    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(this project)
    • Project 6: LCD Clock using DS1307
    • Project 7: LCD Clock with Alarm 
    
 /*
 * Lesson 105-1: Building Clock using DS1307 | Robojax Arduino Step By Step Course
 This code:  Project 6: LED Seven Segment Clock using DS1307
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 (this code)
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 

Written by Ahmad Shamshiri on Feb 07, 2021

 *  * 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/>.
	
  DS1307: RTCLib from Adafruit
   https://github.com/adafruit/RTClib/   	
  HT16k33 library
//  AUTHOR: Rob Tillaart
// VERSION: 0.1.0
// PURPOSE: demo
//     URL: http://www.adafruit.com/products/1002
//     URL: https://github.com/RobTillaart/HT16K33

*/


#include <Wire.h>
#include "RTClib.h"

RTC_DS1307 rtc;

int my_alarm[][6] ={
          //year, month, day, hour, minute, second
          {2022, 4, 11,   10, 19, 0},
          {2022, 4, 11,   10, 19, 10}, 
          {2022, 4, 11,   10, 19, 20},
          {2022, 4, 11,   10, 19, 30},                     
          };
          
                 
const int alarmCount = sizeof(my_alarm) / sizeof(my_alarm[0]);
char alarmName[alarmCount][10] = {
        "Door", "Pet food", "Sleep", "Heater"
        };
        
//pins buzzer or relay is connected to
const int alarmPin[alarmCount] ={10, 11, 12, 13};
const int alarmResetPin =5;

bool debug=true;
bool showPrintAlarm = true;
const int relayType = LOW;//LOW or HIGH level trigger
const bool FORMAT_12=true;//if 12 hours set to true, for 24 hours set to false
int outputON, outputOFF;


    
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"                
      };

int year, month, day, hour, minute, second;   
boolean alarmStatus[alarmCount];

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(2019, 3, 3, 20, 0, 0));
   //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
   
  pinMode( alarmResetPin, INPUT_PULLUP);

  //based on relayType set outputON and outputOFF
  if(relayType)
  {
    outputON = HIGH;
    outputOFF = LOW;
  }else{
    outputON = LOW;
    outputOFF = HIGH; 
  }
Serial.println("		Alarms list");
  for(int i=0; i< alarmCount; i++)
  {
    
    Serial.print("Alarm-");
    Serial.print (i+1);
    Serial.print (" ");
    Serial.print (my_alarm[i][0]);
    Serial.print ("	");   
    Serial.print (monthName[my_alarm[i][1]-1]);
    Serial.print ("("); 
    Serial.print (my_alarm[i][1]);
    Serial.print (")	");     
    Serial.print (my_alarm[i][2]);
    Serial.print ("	");   
    Serial.print (my_alarm[i][3]);
    Serial.print (":"); 
    Serial.print (my_alarm[i][4]);
    Serial.print (":");   
    Serial.print (my_alarm[i][5]); 
    Serial.print ("	Pin: ");   
    Serial.println (alarmPin[i]); 

    pinMode(alarmPin[i], OUTPUT);

    digitalWrite(alarmPin[i], outputOFF);//set output OFF initially

    alarmStatus[i]= false;//set initial status of alarm as false    
  }    
}//setup

void loop () {
    DateTime now = rtc.now();
    
    year = now.year();
    month = now.month();
     if(FORMAT_12)
    {
     hour = now.twelveHour();//12 hours format       
    }else{
     hour = now.hour();//24 hour format     
    }
    day = now.day();


    minute = now.minute();
    second = now.second();
    
      checkAlarm();
      if(debug){
    Serial.print(year, DEC);
    Serial.print('/');
    Serial.print(month, DEC);
    Serial.print('/');
    Serial.print(day, DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(") ");
    if(hour <10)
      Serial.print(0);     
    Serial.print(hour, DEC);
    Serial.print(':');
    if(minute <10)
      Serial.print(0);    
    Serial.print(minute, DEC);
    Serial.print(':');
    if(second <10)
      Serial.print(0);
    Serial.print(second, DEC);
     if(FORMAT_12)
    {
      if(now.isPM())
      {
         Serial.print("PM");  
      }else{
          Serial.print("AM");        
      }
    }
    Serial.println();

    delay(500);
      }
}//loop



void checkAlarm()
{

   for(int i=0; i< alarmCount; i++)
  {
    if(
      year   == my_alarm[i][0] &&
      month  == my_alarm[i][1] &&
      day    == my_alarm[i][2] &&
      hour   == my_alarm[i][3] &&
      minute == my_alarm[i][4] &&
      second == my_alarm[i][5] )
      {
       alarmAction(i);
       alarmStatus[i]=true;//report the status
      }
    alarmOFF(i);//check to see when alarm should be turned off

  }   
}//checkAlarm()

void printAlarm (int i)
{
  if(showPrintAlarm){
    Serial.print("Alarm ");
    Serial.print (alarmName[i]);
    Serial.print(" on ");    
    Serial.print (my_alarm[i][0]);
    Serial.print ("	");   
    Serial.print (monthName[my_alarm[i][1]-1]);
    Serial.print ("("); 
    Serial.print (my_alarm[i][1]);
    Serial.print (")	");     
    Serial.print (my_alarm[i][2]);
    Serial.print ("	 at ");   
    Serial.print (my_alarm[i][3]);
    Serial.print (":"); 
    Serial.print (my_alarm[i][4]);
    Serial.print (":");   
    Serial.println (my_alarm[i][5]);  
  }
}//printAlarm end

/*
 * alarmAction
 * turn the specific pin i associated to the alarm ON
 */
void alarmAction(int i)
{
    printAlarm (i);
    digitalWrite(alarmPin[i], outputON);

  
}//alarmAction end


/*
 * alarmOFF
 * Turns the specific alarm i off
 */
void alarmOFF (int i)
{
 
   
      if(digitalRead(alarmResetPin) ==LOW)
     {
      alarmStatus[i] = false;//change the status of particular alarm

       digitalWrite(alarmPin[i], outputOFF); //turn relay OFF

      if(debug)
      Serial.println("Alarm OFF");        
     }
  
}//alarmOFF end

    The least I expect from you is to thumb up the video and subscribe to my channel. I appriciate that. .I have spent months making these lectures and writing code. You don't lose anything by subscribging to my channel. Your subscription is stamp of approval to my videos and more people can find them and in it turn it helps me. Thank you

    If you found this tutorial helpful, please support me so I can continue creating content like this. support me via PayPal

    **** AFFILIATE PROGRAM **** We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

    Right Side
    footer