Simple Alarm Clock with DS1302 RTC

An alarm clock using a DS1302 RTC and a buzzer. You can set the RTC by a keypad as well as set the alarm.

Nov 20, 2018

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clocks

Components and supplies

Standard LCD - 16x2 White on Blue

Real Time Clock (RTC)

Arduino UNO

Buzzer

Project description

Code

RTC_alarm_clock_LCD.ino

arduino

Works with UNO + RTC DS1302 + LCD i2c + 4x4 keypad (Majors changes made 12/04/18 to solve some issues)

1//This code is to use with DS1302 RTC module + 4*4 Keypad + LCD i2c +  Arduino + Buzzer
2//After wiring the modules, the LCD will show the default date  and time or the one set before
3//The objective of this project is that you can  set the RTC module from the keypad, and sure it will stay stored
4//Then show  it on the screen and after you can set your alarm.
5//Refer to Surtrtech.com or  SurtrTech youtube channel for more information
6
7#include <Keypad.h> //Libraries  needed
8#include <Wire.h>
9#include <virtuabotixRTC.h>
10#include <LiquidCrystal_I2C.h>
11
12#define  I2C_ADDR 0x27 //LCD i2c stuff
13#define BACKLIGHT_PIN 3
14#define En_pin 2
15#define  Rw_pin 1
16#define Rs_pin 0
17#define D4_pin 4
18#define D5_pin 5
19#define  D6_pin 6
20#define D7_pin 7
21
22LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
23
24
25virtuabotixRTC  myRTC(2, 3, 4); //Wiring of the RTC (CLK,DAT,RST)
26                               //If  you change the wiring change the pins here also
27
28
29const byte numRows= 4;  //number of rows on the keypad
30const byte numCols= 4; //number of columns on  the keypad
31
32//keymap defines the key pressed according to the row and columns  just as appears on the keypad
33char keymap[numRows][numCols]= 
34{
35{'1', '2',  '3', 'A'}, 
36{'4', '5', '6', 'B'}, 
37{'7', '8', '9', 'C'},
38{'*', '0', '#',  'D'}
39};
40
41
42byte rowPins[numRows] = {12,11,10,9}; //Rows 0 to 3 //if you  modify your pins you should modify this too
43byte colPins[numCols]= {8,7,6,5};  //Columns 0 to 3
44
45int i1,i2,i3,i4;
46char c1,c2,c3,c4;
47char keypressed,keypressedx;
48
49int  A_hour=NULL;
50int A_minute=NULL;
51int AlarmIsActive=NULL;
52
53int buzzer  = 13;
54
55
56Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows,  numCols);
57
58
59void setup() {
60  Serial.begin(9600);
61  lcd.begin (16,2);  //Initialize the LCD
62  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
63  lcd.setBacklight(HIGH);
64  lcd.home ();
65                                                   
66}
67
68void  loop() {
69   
70  while(keypressed == NO_KEY){ //As long as no key is pressed  we keep showing the date and time, I'm obliged to clear the screen everytime so  the numbers don't get confused
71                               //And I should  add that little delay so the screen shows correctly otherwise it didn't work for  me
72  keypressed = myKeypad.getKey();
73  lcd.clear(); //Here after clearing  the LCD we take the time from the module and print it on the screen with usual LCD  functions
74  myRTC.updateTime();
75
76  if(myRTC.hours==A_hour && myRTC.minutes==A_minute  && AlarmIsActive==1 && myRTC.seconds >= 0 && myRTC.seconds <= 2){
77    while(keypressedx  == NO_KEY){
78    tone(buzzer, 1000); //You can modify the tone or make your own  sound
79    delay(100);
80    tone(buzzer, 2000);
81    delay(100);
82    lcd.clear();
83    lcd.print("Get up !!!"); //Message to show when the alarm is ringing
84    keypressedx  = myKeypad.getKey();
85    }
86  }
87  keypressedx = NO_KEY;
88  noTone(buzzer);
89  lcd.setCursor(0,0);
90  lcd.print(myRTC.dayofmonth);
91  lcd.print("/");
92  lcd.print(myRTC.month);
93  lcd.print("/");
94  lcd.print(myRTC.year);
95  lcd.setCursor(0,1);
96  lcd.print(myRTC.hours);
97  lcd.print(":");
98  lcd.print(myRTC.minutes);
99  lcd.print(":");
100  lcd.print(myRTC.seconds);
101  delay(100);
102  }
103 
104
105         if (keypressed == '*') //As we everytime check the key pressed we only  proceed to setup if we press "*"
106             {
107              lcd.clear();
108              lcd.print("     Setup");
109             delay(1000);
110              lcd.clear();
111              lcd.print("Setup year");
112              //So you can understand  how this works, first it shows us "setup" then it prints "setup year" and now  you can write your year normally (2-0-1-8)
113              //It automatically passes  to setting up the month...until it's finished
114              //The keys from keypad  are all considered chars (c) so we should convert them to int that's what I did  then we store them (i)
115              //We do some math and we get the year, month...  as int so we can inject them to the RTC otherwise it will not be compiled
116              //Months  like April you should write 04, 03 for March... otherwise it will not pass to the  next parameter
117              //The RTC virtuabotix library is already set to  not accept strange time and dates (45/17/1990) (58:90:70), and yes old dates are  considered as errors
118             char keypressed2 = myKeypad.waitForKey();  
119                    if (keypressed2 != NO_KEY && keypressed2 !='*' && keypressed2  !='#' && keypressed2 !='A' && keypressed2 !='B' && keypressed2 !='C' && keypressed2  !='D' )
120                      {
121                       c1 = keypressed2;
122                       lcd.setCursor(0, 1);
123                       lcd.print(c1);
124                       }
125                 char      keypressed3 = myKeypad.waitForKey();
126                    if (keypressed3 != NO_KEY && keypressed3 !='*' && keypressed3  !='#' && keypressed3 !='A' && keypressed3 !='B' && keypressed3 !='C' && keypressed3  !='D' )
127                      {
128                       c2 = keypressed3;
129                       lcd.setCursor(1, 1);
130                       lcd.print(c2);
131                       }
132                   char  keypressed4 = myKeypad.waitForKey();
133                   if (keypressed4 != NO_KEY && keypressed4 !='*' && keypressed4  !='#' && keypressed4 !='A' && keypressed4 !='B' && keypressed4 !='C' && keypressed4  !='D' )
134                      {
135                       c3 = keypressed4;
136                       lcd.setCursor(2, 1);
137                       lcd.print(c3);
138                       }
139                   char   keypressed5 = myKeypad.waitForKey();
140                   if (keypressed5 != NO_KEY && keypressed5 !='*' && keypressed5  !='#' && keypressed5 !='A' && keypressed5 !='B' && keypressed5 !='C' && keypressed5  !='D' )
141                      {
142                       c4 = keypressed5;
143                       lcd.setCursor(3, 1);
144                       lcd.print(c4);
145                       }
146
147                     i1=(c1-48)*1000;        //the  keys pressed are stored into chars I convert them to int then i did some multiplication  to get the code as an int of xxxx
148                     i2=(c2-48)*100;
149                     i3=(c3-48)*10;
150                     i4=c4-48;
151                     int N_year=i1+i2+i3+i4;
152                   delay(500);
153                     lcd.clear();
154                     lcd.print("Setup  month");
155
156////////////////////////////////////////////////////////////////
157                     char keypressed6 = myKeypad.waitForKey();  // here all programs  are stopped until you enter the four digits then it gets compared to the code above
158                    if (keypressed6 != NO_KEY && keypressed6 !='*' && keypressed6  !='#' && keypressed6 !='A' && keypressed6 !='B' && keypressed6 !='C' && keypressed6  !='D' )
159                      {
160                       c1 = keypressed6;
161                       lcd.setCursor(0, 1);
162                       lcd.print(c1);
163                       }
164                    char   keypressed7 = myKeypad.waitForKey();
165                    if (keypressed7 != NO_KEY && keypressed7 !='*' && keypressed7  !='#' && keypressed7 !='A' && keypressed7 !='B' && keypressed7 !='C' && keypressed7  !='D' )
166                      {
167                       c2 = keypressed7;
168                       lcd.setCursor(1, 1);
169                       lcd.print(c2);
170                       }
171
172
173                     i1=(c1-48)*10;
174                     i2=c2-48;
175                    int N_month=i1+i2;
176                     delay(500);
177
178                     lcd.clear();
179                     lcd.print("Setup Day");
180                     
181 ////////////////////////////////////////////////////////////////                    
182                      char keypressed8 = myKeypad.waitForKey();  // here all programs are stopped until you enter the four digits then it gets  compared to the code above
183                    if (keypressed8 != NO_KEY && keypressed8  !='*' && keypressed8 !='#' && keypressed8 !='A' && keypressed8 !='B' && keypressed8  !='C' && keypressed8 !='D' )
184                      {
185                        c1  = keypressed8;
186                       lcd.setCursor(0, 1);
187                       lcd.print(c1);
188                       }
189                      char keypressed9 = myKeypad.waitForKey();
190                    if (keypressed9 != NO_KEY && keypressed9 !='*' && keypressed9  !='#' && keypressed9 !='A' && keypressed9 !='B' && keypressed9 !='C' && keypressed9  !='D' )
191                      {
192                        c2 = keypressed9;
193                       lcd.setCursor(1, 1);
194                       lcd.print(c2);
195                       }
196
197
198                     i1=(c1-48)*10;
199                     i2=c2-48;
200                    int N_day=i1+i2;
201                    delay(500);
202                     lcd.clear();
203                     lcd.print("Setup hour");
204////////////////////////////////////////////////////////////////////////////////////:                     
205                     char keypressed10 = myKeypad.waitForKey();  // here all programs are stopped until you enter the four digits then it gets  compared to the code above
206                    if (keypressed10 != NO_KEY &&  keypressed10 !='*' && keypressed10 !='#' && keypressed10 !='A' && keypressed10 !='B'  && keypressed10 !='C' && keypressed10 !='D' )
207                      {
208                       c1  = keypressed10;
209                       lcd.setCursor(0, 1);
210                       lcd.print(c1);
211                       }
212                    char   keypressed11 = myKeypad.waitForKey();
213                    if (keypressed11 != NO_KEY && keypressed11 !='*' && keypressed11  !='#' && keypressed11 !='A' && keypressed11 !='B' && keypressed11 !='C' && keypressed11  !='D' )
214                      {
215                        c2 = keypressed11;
216                       lcd.setCursor(1, 1);
217                       lcd.print(c2);
218                       }
219
220
221                     i1=(c1-48)*10;
222                     i2=c2-48;
223                    int N_hour=i1+i2;
224                    delay(500);
225                     lcd.clear();
226                     lcd.print("Setup minutes");
227////////////////////////////////////////////////////////////////////////////////////:
228                    char keypressed12 = myKeypad.waitForKey();  // here all programs  are stopped until you enter the four digits then it gets compared to the code above
229                    if (keypressed12 != NO_KEY && keypressed12 !='*' && keypressed12  !='#' && keypressed12 !='A' && keypressed12 !='B' && keypressed12 !='C' && keypressed12  !='D' )
230                      {
231                        c1 = keypressed12;
232                       lcd.setCursor(0, 1);
233                       lcd.print(c1);
234                       }
235                   char    keypressed13 = myKeypad.waitForKey();
236                    if (keypressed13 != NO_KEY && keypressed13 !='*' && keypressed13  !='#' && keypressed13 !='A' && keypressed13 !='B' && keypressed13 !='C' && keypressed13  !='D' )
237                      {
238                        c2 = keypressed13;
239                       lcd.setCursor(1, 1);
240                       lcd.print(c2);
241                       }
242
243
244                     i1=(c1-48)*10;
245                     i2=c2-48;
246                    int N_minutes=i1+i2;
247                    delay(500);
248                     lcd.clear();
249
250                    myRTC.setDS1302Time(22,  N_minutes, N_hour, 1, N_day, N_month, N_year); //once we're done setting the date  and time we transfer to values to the RTC module
251                                                                                           //the  22 stands for seconds you can add a setup for it too if you want
252                                                                                           //the  1 stands for day of the week, as long I don't show it on the screen I don't change  it
253                    keypressed=NO_KEY; //the "*" key is stored in "keypressed"  so I remove that value from it otherwise it will get me in the setup again
254              }
255/////////////////////////////////////////Alarme  setup/////////////////////////////////
256              
257             if (keypressed  == 'A'){
258              lcd.clear();
259              lcd.print("  Alarm setup  ");
260              delay(1000);
261              lcd.clear();
262              lcd.print("Set  alarm hour");
263               
264               char keypressed14 = myKeypad.waitForKey();  // here all programs are stopped until you enter the four digits then it gets  compared to the code above
265                    if (keypressed14 != NO_KEY &&  keypressed14 !='*' && keypressed14 !='#' && keypressed14 !='A' && keypressed14 !='B'  && keypressed14 !='C' && keypressed14 !='D' )
266                      {
267                       c1  = keypressed14;
268                       lcd.setCursor(0, 1);
269                       lcd.print(c1);
270                       }
271                    char   keypressed15 = myKeypad.waitForKey();
272                    if (keypressed15 != NO_KEY && keypressed15 !='*' && keypressed15  !='#' && keypressed15 !='A' && keypressed15 !='B' && keypressed15 !='C' && keypressed15  !='D' )
273                      {
274                        c2 = keypressed15;
275                       lcd.setCursor(1, 1);
276                       lcd.print(c2);
277                       }
278
279
280                     i1=(c1-48)*10;
281                     i2=c2-48;
282                     A_hour=i1+i2;
283                    delay(500);
284                     lcd.clear();
285                     lcd.print("Set alarm minutes");
286                      char  keypressed16 = myKeypad.waitForKey();  // here all programs are stopped until you  enter the four digits then it gets compared to the code above
287                    if  (keypressed16 != NO_KEY && keypressed16 !='*' && keypressed16 !='#' && keypressed16  !='A' && keypressed16 !='B' && keypressed16 !='C' && keypressed16 !='D' )
288                      {
289                       c1 = keypressed16;
290                       lcd.setCursor(0,  1);
291                       lcd.print(c1);
292                       }
293                    char   keypressed17 = myKeypad.waitForKey();
294                    if (keypressed17  != NO_KEY && keypressed17 !='*' && keypressed17 !='#' && keypressed17 !='A' && keypressed17  !='B' && keypressed17 !='C' && keypressed17 !='D' )
295                      {
296                        c2 = keypressed17;
297                       lcd.setCursor(1,  1);
298                       lcd.print(c2);
299                       }
300
301
302                     i1=(c1-48)*10;
303                     i2=c2-48;
304                     A_minute=i1+i2;
305                    delay(500);
306                     lcd.clear();
307                      AlarmIsActive=1;
308                      keypressed=NO_KEY;
309             }
310             if (keypressed  == 'B')
311             {
312              lcd.clear();
313              lcd.print("Alarm  deactivated");
314              AlarmIsActive=0;
315              keypressed=NO_KEY;
316              delay(500);
317             }
318             else {
319              myRTC.updateTime();
320              keypressed=NO_KEY;
321             }
322             
323
324}
325

//This code is to use with DS1302 RTC module + 4*4 Keypad + LCD i2c +  Arduino + Buzzer
//After wiring the modules, the LCD will show the default date  and time or the one set before
//The objective of this project is that you can  set the RTC module from the keypad, and sure it will stay stored
//Then show  it on the screen and after you can set your alarm.
//Refer to Surtrtech.com or  SurtrTech youtube channel for more information

#include <Keypad.h> //Libraries  needed
#include <Wire.h>
#include <virtuabotixRTC.h>
#include <LiquidCrystal_I2C.h>

#define  I2C_ADDR 0x27 //LCD i2c stuff
#define BACKLIGHT_PIN 3
#define En_pin 2
#define  Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define  D6_pin 6
#define D7_pin 7

LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);


virtuabotixRTC  myRTC(2, 3, 4); //Wiring of the RTC (CLK,DAT,RST)
                               //If  you change the wiring change the pins here also


const byte numRows= 4;  //number of rows on the keypad
const byte numCols= 4; //number of columns on  the keypad

//keymap defines the key pressed according to the row and columns  just as appears on the keypad
char keymap[numRows][numCols]= 
{
{'1', '2',  '3', 'A'}, 
{'4', '5', '6', 'B'}, 
{'7', '8', '9', 'C'},
{'*', '0', '#',  'D'}
};


byte rowPins[numRows] = {12,11,10,9}; //Rows 0 to 3 //if you  modify your pins you should modify this too
byte colPins[numCols]= {8,7,6,5};  //Columns 0 to 3

int i1,i2,i3,i4;
char c1,c2,c3,c4;
char keypressed,keypressedx;

int  A_hour=NULL;
int A_minute=NULL;
int AlarmIsActive=NULL;

int buzzer  = 13;


Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows,  numCols);


void setup() {
  Serial.begin(9600);
  lcd.begin (16,2);  //Initialize the LCD
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
  lcd.home ();
                                                   
}

void  loop() {
   
  while(keypressed == NO_KEY){ //As long as no key is pressed  we keep showing the date and time, I'm obliged to clear the screen everytime so  the numbers don't get confused
                               //And I should  add that little delay so the screen shows correctly otherwise it didn't work for  me
  keypressed = myKeypad.getKey();
  lcd.clear(); //Here after clearing  the LCD we take the time from the module and print it on the screen with usual LCD  functions
  myRTC.updateTime();

  if(myRTC.hours==A_hour && myRTC.minutes==A_minute  && AlarmIsActive==1 && myRTC.seconds >= 0 && myRTC.seconds <= 2){
    while(keypressedx  == NO_KEY){
    tone(buzzer, 1000); //You can modify the tone or make your own  sound
    delay(100);
    tone(buzzer, 2000);
    delay(100);
    lcd.clear();
    lcd.print("Get up !!!"); //Message to show when the alarm is ringing
    keypressedx  = myKeypad.getKey();
    }
  }
  keypressedx = NO_KEY;
  noTone(buzzer);
  lcd.setCursor(0,0);
  lcd.print(myRTC.dayofmonth);
  lcd.print("/");
  lcd.print(myRTC.month);
  lcd.print("/");
  lcd.print(myRTC.year);
  lcd.setCursor(0,1);
  lcd.print(myRTC.hours);
  lcd.print(":");
  lcd.print(myRTC.minutes);
  lcd.print(":");
  lcd.print(myRTC.seconds);
  delay(100);
  }
 

         if (keypressed == '*') //As we everytime check the key pressed we only  proceed to setup if we press "*"
             {
              lcd.clear();
              lcd.print("     Setup");
             delay(1000);
              lcd.clear();
              lcd.print("Setup year");
              //So you can understand  how this works, first it shows us "setup" then it prints "setup year" and now  you can write your year normally (2-0-1-8)
              //It automatically passes  to setting up the month...until it's finished
              //The keys from keypad  are all considered chars (c) so we should convert them to int that's what I did  then we store them (i)
              //We do some math and we get the year, month...  as int so we can inject them to the RTC otherwise it will not be compiled
              //Months  like April you should write 04, 03 for March... otherwise it will not pass to the  next parameter
              //The RTC virtuabotix library is already set to  not accept strange time and dates (45/17/1990) (58:90:70), and yes old dates are  considered as errors
             char keypressed2 = myKeypad.waitForKey();  
                    if (keypressed2 != NO_KEY && keypressed2 !='*' && keypressed2  !='#' && keypressed2 !='A' && keypressed2 !='B' && keypressed2 !='C' && keypressed2  !='D' )
                      {
                       c1 = keypressed2;
                       lcd.setCursor(0, 1);
                       lcd.print(c1);
                       }
                 char      keypressed3 = myKeypad.waitForKey();
                    if (keypressed3 != NO_KEY && keypressed3 !='*' && keypressed3  !='#' && keypressed3 !='A' && keypressed3 !='B' && keypressed3 !='C' && keypressed3  !='D' )
                      {
                       c2 = keypressed3;
                       lcd.setCursor(1, 1);
                       lcd.print(c2);
                       }
                   char  keypressed4 = myKeypad.waitForKey();
                   if (keypressed4 != NO_KEY && keypressed4 !='*' && keypressed4  !='#' && keypressed4 !='A' && keypressed4 !='B' && keypressed4 !='C' && keypressed4  !='D' )
                      {
                       c3 = keypressed4;
                       lcd.setCursor(2, 1);
                       lcd.print(c3);
                       }
                   char   keypressed5 = myKeypad.waitForKey();
                   if (keypressed5 != NO_KEY && keypressed5 !='*' && keypressed5  !='#' && keypressed5 !='A' && keypressed5 !='B' && keypressed5 !='C' && keypressed5  !='D' )
                      {
                       c4 = keypressed5;
                       lcd.setCursor(3, 1);
                       lcd.print(c4);
                       }

                     i1=(c1-48)*1000;        //the  keys pressed are stored into chars I convert them to int then i did some multiplication  to get the code as an int of xxxx
                     i2=(c2-48)*100;
                     i3=(c3-48)*10;
                     i4=c4-48;
                     int N_year=i1+i2+i3+i4;
                   delay(500);
                     lcd.clear();
                     lcd.print("Setup  month");

////////////////////////////////////////////////////////////////
                     char keypressed6 = myKeypad.waitForKey();  // here all programs  are stopped until you enter the four digits then it gets compared to the code above
                    if (keypressed6 != NO_KEY && keypressed6 !='*' && keypressed6  !='#' && keypressed6 !='A' && keypressed6 !='B' && keypressed6 !='C' && keypressed6  !='D' )
                      {
                       c1 = keypressed6;
                       lcd.setCursor(0, 1);
                       lcd.print(c1);
                       }
                    char   keypressed7 = myKeypad.waitForKey();
                    if (keypressed7 != NO_KEY && keypressed7 !='*' && keypressed7  !='#' && keypressed7 !='A' && keypressed7 !='B' && keypressed7 !='C' && keypressed7  !='D' )
                      {
                       c2 = keypressed7;
                       lcd.setCursor(1, 1);
                       lcd.print(c2);
                       }


                     i1=(c1-48)*10;
                     i2=c2-48;
                    int N_month=i1+i2;
                     delay(500);

                     lcd.clear();
                     lcd.print("Setup Day");
                     
 ////////////////////////////////////////////////////////////////                    
                      char keypressed8 = myKeypad.waitForKey();  // here all programs are stopped until you enter the four digits then it gets  compared to the code above
                    if (keypressed8 != NO_KEY && keypressed8  !='*' && keypressed8 !='#' && keypressed8 !='A' && keypressed8 !='B' && keypressed8  !='C' && keypressed8 !='D' )
                      {
                        c1  = keypressed8;
                       lcd.setCursor(0, 1);
                       lcd.print(c1);
                       }
                      char keypressed9 = myKeypad.waitForKey();
                    if (keypressed9 != NO_KEY && keypressed9 !='*' && keypressed9  !='#' && keypressed9 !='A' && keypressed9 !='B' && keypressed9 !='C' && keypressed9  !='D' )
                      {
                        c2 = keypressed9;
                       lcd.setCursor(1, 1);
                       lcd.print(c2);
                       }


                     i1=(c1-48)*10;
                     i2=c2-48;
                    int N_day=i1+i2;
                    delay(500);
                     lcd.clear();
                     lcd.print("Setup hour");
////////////////////////////////////////////////////////////////////////////////////:                     
                     char keypressed10 = myKeypad.waitForKey();  // here all programs are stopped until you enter the four digits then it gets  compared to the code above
                    if (keypressed10 != NO_KEY &&  keypressed10 !='*' && keypressed10 !='#' && keypressed10 !='A' && keypressed10 !='B'  && keypressed10 !='C' && keypressed10 !='D' )
                      {
                       c1  = keypressed10;
                       lcd.setCursor(0, 1);
                       lcd.print(c1);
                       }
                    char   keypressed11 = myKeypad.waitForKey();
                    if (keypressed11 != NO_KEY && keypressed11 !='*' && keypressed11  !='#' && keypressed11 !='A' && keypressed11 !='B' && keypressed11 !='C' && keypressed11  !='D' )
                      {
                        c2 = keypressed11;
                       lcd.setCursor(1, 1);
                       lcd.print(c2);
                       }


                     i1=(c1-48)*10;
                     i2=c2-48;
                    int N_hour=i1+i2;
                    delay(500);
                     lcd.clear();
                     lcd.print("Setup minutes");
////////////////////////////////////////////////////////////////////////////////////:
                    char keypressed12 = myKeypad.waitForKey();  // here all programs  are stopped until you enter the four digits then it gets compared to the code above
                    if (keypressed12 != NO_KEY && keypressed12 !='*' && keypressed12  !='#' && keypressed12 !='A' && keypressed12 !='B' && keypressed12 !='C' && keypressed12  !='D' )
                      {
                        c1 = keypressed12;
                       lcd.setCursor(0, 1);
                       lcd.print(c1);
                       }
                   char    keypressed13 = myKeypad.waitForKey();
                    if (keypressed13 != NO_KEY && keypressed13 !='*' && keypressed13  !='#' && keypressed13 !='A' && keypressed13 !='B' && keypressed13 !='C' && keypressed13  !='D' )
                      {
                        c2 = keypressed13;
                       lcd.setCursor(1, 1);
                       lcd.print(c2);
                       }


                     i1=(c1-48)*10;
                     i2=c2-48;
                    int N_minutes=i1+i2;
                    delay(500);
                     lcd.clear();

                    myRTC.setDS1302Time(22,  N_minutes, N_hour, 1, N_day, N_month, N_year); //once we're done setting the date  and time we transfer to values to the RTC module
                                                                                           //the  22 stands for seconds you can add a setup for it too if you want
                                                                                           //the  1 stands for day of the week, as long I don't show it on the screen I don't change  it
                    keypressed=NO_KEY; //the "*" key is stored in "keypressed"  so I remove that value from it otherwise it will get me in the setup again
              }
/////////////////////////////////////////Alarme  setup/////////////////////////////////
              
             if (keypressed  == 'A'){
              lcd.clear();
              lcd.print("  Alarm setup  ");
              delay(1000);
              lcd.clear();
              lcd.print("Set  alarm hour");
               
               char keypressed14 = myKeypad.waitForKey();  // here all programs are stopped until you enter the four digits then it gets  compared to the code above
                    if (keypressed14 != NO_KEY &&  keypressed14 !='*' && keypressed14 !='#' && keypressed14 !='A' && keypressed14 !='B'  && keypressed14 !='C' && keypressed14 !='D' )
                      {
                       c1  = keypressed14;
                       lcd.setCursor(0, 1);
                       lcd.print(c1);
                       }
                    char   keypressed15 = myKeypad.waitForKey();
                    if (keypressed15 != NO_KEY && keypressed15 !='*' && keypressed15  !='#' && keypressed15 !='A' && keypressed15 !='B' && keypressed15 !='C' && keypressed15  !='D' )
                      {
                        c2 = keypressed15;
                       lcd.setCursor(1, 1);
                       lcd.print(c2);
                       }


                     i1=(c1-48)*10;
                     i2=c2-48;
                     A_hour=i1+i2;
                    delay(500);
                     lcd.clear();
                     lcd.print("Set alarm minutes");
                      char  keypressed16 = myKeypad.waitForKey();  // here all programs are stopped until you  enter the four digits then it gets compared to the code above
                    if  (keypressed16 != NO_KEY && keypressed16 !='*' && keypressed16 !='#' && keypressed16  !='A' && keypressed16 !='B' && keypressed16 !='C' && keypressed16 !='D' )
                      {
                       c1 = keypressed16;
                       lcd.setCursor(0,  1);
                       lcd.print(c1);
                       }
                    char   keypressed17 = myKeypad.waitForKey();
                    if (keypressed17  != NO_KEY && keypressed17 !='*' && keypressed17 !='#' && keypressed17 !='A' && keypressed17  !='B' && keypressed17 !='C' && keypressed17 !='D' )
                      {
                        c2 = keypressed17;
                       lcd.setCursor(1,  1);
                       lcd.print(c2);
                       }


                     i1=(c1-48)*10;
                     i2=c2-48;
                     A_minute=i1+i2;
                    delay(500);
                     lcd.clear();
                      AlarmIsActive=1;
                      keypressed=NO_KEY;
             }
             if (keypressed  == 'B')
             {
              lcd.clear();
              lcd.print("Alarm  deactivated");
              AlarmIsActive=0;
              keypressed=NO_KEY;
              delay(500);
             }
             else {
              myRTC.updateTime();
              keypressed=NO_KEY;
             }
             

}

Downloadable files

ds1302 alarm clock schematic

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