Never wake up too late - Alarm Clock with annoying tone

An Arduino-based alarm clock with a 3D printed casing.

May 26, 2019

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clocks

alarm

Components and supplies

Alphanumeric LCD, 20 x 4

Buzzer

Resistor 10k ohm

Pushbutton switch 12mm

Breadboard (generic)

Real Time Clock (RTC)

Arduino UNO

Tools and machines

Soldering iron (generic)

3D Printer (generic)

Apps and platforms

Arduino IDE

Project description

Code

Alarm Clock

arduino

1/* Alarm Clock
2  by smi1100 - 06/06/2019
3  My first project. The  following components are needed:
4  - Arduino Uno
5  - DS3231 real time clock
6  - 20x4 I2C Display
7  - buzzer
8  - 5 buttons
9  - 5 resistors 10k Ohm
10  - bread board
11  - casing
12
13
14/* modul 0 - I2C Bus
15  - I2C adresses
16    - LCD 0x27
17    - real time clock
18      RTC DS3231 0x68
19      EEPROM  AT24C32 0x57 (not in use)
20*/
21
22#include <Wire.h>
23
24
25/* modul 1 -  DS3231 real time clock
26  - connections (from right side) - GND, VCC, SDA, SCL
27  - RTClib.h is required
28  - I2C connection
29*/
30
31#include "RTClib.h"
32RTC_DS1307  rtc;
33char weekday[7][12] = {"Sonntag", "Montag", "Dienstag", "Mittwoch",  "Donnerst.", "Freitag", "Samstag"};
34// in english char weekday[7][12] =  {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
35
36
37/*  modul 2 - Joy-IT SBC-LCD 20x4 display
38  - 4 rows, 20 characters
39  - connections  (from right side) - GND, VCC, SDA, SCL
40  - LiquidCrystal_I2C.h is required
41  - I2C connection
42*/
43
44#include <LiquidCrystal_I2C.h>
45LiquidCrystal_I2C  lcd(0x27, 20, 4); // adress 0x27
46//LiquidCrystal_I2C lcd(0x3F,20,4); // if the  lcd is not working, change adress to 0x3F
47
48
49/* modul 3 - buttons to adjust  the alarm time and button for the buzzer
50*/
51
52int buzzer = 4;
53int buttonhourup  = A3;
54int buttonhourdown = A2;
55int buttonminuteup = A1;
56int buttonminutedown  = A0;
57int readbuttonhourup;
58int readbuttonhourdown;
59int readbuttonminuteup;
60int  readbuttonminutedown;
61
62// alarmtime
63int alarmtimehour;
64int alarmtimeminute;
65
66
67/*  modul 4 - switch for alarm on/off
68  - OneButton.h is required
69  - see internet  resource https://www.makerblog.at/2015/01/arduino-und-pushbuttons-drucktaster-einbinden-mit-der-onebutton-library/
70*/
71
72#include  "OneButton.h"
73int buttonalarm = 5;
74OneButton button(buttonalarm, false);
75int  alarmstate = 1;             // equal to alarm is on 
76int alarmtimeequaltime =  0;     // active when alarm time is equal to time
77
78
79/* modul 5 - EEPROM  - backup of alarmtime in the EEPROM
80  - EEPROM.h is required
81*/
82
83#include  "EEPROM.h"
84
85
86/* code 1 - summer or winter time
87  - see internet resource  https://kaufma.net/blog/article/2016/08/24/sommerzeit-im-microcontroller/
88  -  see internet resource https://electronicfreakblog.wordpress.com/2014/03/06/die-zeit-im-sommer-und-im-winter/
89  DST = Daylight Saving Time, equal to summer time
90*/
91
92int DST;
93
94
95/*  code 2 - changing buzzer sound
96*/
97
98unsigned long previousMillis = 0;
99const  long interval = 1000;
100
101
102void setup ()
103{
104  Serial.begin(9600);
105
106  // read alarmtime from EEPROM
107
108  alarmtimehour = EEPROM.read(0);
109  alarmtimeminute  = EEPROM.read(1);
110
111
112  // initialize DS3231 RTC
113
114  Serial.begin(9600);
115  while (!Serial); // for Leonardo/Micro/Zero
116
117  if (! rtc.begin())
118  {
119    Serial.println("Couldn't find RTC");
120    while (1);
121  }
122
123  if  (! rtc.isrunning())
124  {
125    // define format once
126    Serial.println("RTC  is NOT running!");
127    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
128    Serial.println("RTC  adjusted!");
129  }
130
131
132  // initialize display
133
134  lcd.init();
135  lcd.backlight();
136
137
138  // initialize buttons and buzzer
139
140  pinMode(buttonhourup,  INPUT);
141  pinMode(buttonhourdown, INPUT);
142  pinMode(buttonminuteup, INPUT);
143  pinMode(buttonminutedown, INPUT);
144  pinMode(buzzer, OUTPUT);
145
146
147  //  initialize button as a switch
148
149  pinMode(buttonalarm, INPUT);
150  button.attachClick(clickedIt);
151  
152}
153
154void loop ()
155{
156
157//determine summer or winter time
158
159int  DST;
160
161DateTime now = rtc.now();
162
163if (now.month() == 3  && now.day()  > 24 && now.dayOfTheWeek() == 1 && now.hour() >= 2 || //exakter Tag Beginn
164    now.month()  == 3  && now.day() + 8 - now.dayOfTheWeek() > 31 && now.dayOfTheWeek() != 1 || //  restlichen Tage des Mrz
165    now.month() >  3 && now.month() < 10 || //April bis  September
166    now.month() == 10 && now.day() + 8 - now.dayOfTheWeek() < 32 ||  //Oktober bis Tag vor letztem Sonntag
167    now.month() == 10 && now.day() > 24  && now.dayOfTheWeek() == 1 && now.hour() <= 3) //letzter Sonntag
168    {
169    DST  = 1;
170    Serial.print("summertime - ");
171    Serial.print("time: ");
172    Serial.println(now.hour()+DST);
173    }
174else 
175    {
176    DST = 0;
177    Serial.print("wintertime - ");
178    Serial.print("time: ");
179    Serial.println(now.hour());
180   }
181
182
183// button as a switch
184
185  button.tick();
186  delay(10);
187
188//  shown data on the LCD
189
190  lcd.setCursor(1, 0);
191
192  lcd.print(weekday[now.dayOfTheWeek()]);
193  lcd.print("   ");
194
195  lcd.setCursor(13, 0);
196
197  if (now.day() < 10)  lcd.print("0");            // less than 10 -> add 0 before it
198  lcd.print(now.day(),  DEC);
199  lcd.print(".");
200
201  if (now.month() < 10) lcd.print("0");          //  less than 10 -> add 0 before it
202  lcd.print(now.month(), DEC);
203  //lcd.print(".");
204  //lcd.print(now.year(), DEC);
205
206
207  lcd.setCursor(0, 1);
208  lcd.print("   Zeit      Alarm");
209  // in english lcd.print("   time      alarm");
210
211  lcd.setCursor(0, 2);
212
213  lcd.print(" ");
214  if ((now.hour() + DST) <  10) lcd.print("0");       // less than 10 -> add 0 before it
215  lcd.print((now.hour()  + DST), DEC);
216  lcd.print(":");
217
218  if (now.minute() < 10) lcd.print("0");       // less than 10 -> add 0 before it
219  lcd.print(now.minute(), DEC);
220  lcd.print(":");
221
222  if (now.second() < 10) lcd.print("0");       // less  than 10 -> add 0 before it
223  lcd.print(now.second(), DEC);
224  lcd.print("    ");
225
226  if (alarmtimehour < 10) lcd.print("0");       // less than 10  -> add 0 before it
227  lcd.print(alarmtimehour, DEC);
228  lcd.print(':');
229
230  if (alarmtimeminute < 10) lcd.print("0");       // less than 10 -> add 0 before  it
231  lcd.print(alarmtimeminute, DEC);
232
233  lcd.setCursor(14, 3);
234  if  (alarmstate == 1)lcd.print("EIN");
235  else lcd.print("AUS");
236  /* in english  if (alarmstate == 1)lcd.print("ON");
237  else lcd.print("OFF");
238  */
239
240  // adjust the alarm time (hour)
241
242  readbuttonhourup = digitalRead(buttonhourup);
243
244  if (readbuttonhourup == HIGH)
245  {
246    delay(100);
247    if (alarmtimehour  >= 23) alarmtimehour = 0;
248    else alarmtimehour ++;
249  }
250
251
252  readbuttonhourdown  = digitalRead(buttonhourdown);
253
254  if (readbuttonhourdown == HIGH)
255  {
256    delay(100);
257    if (alarmtimehour <= 0) alarmtimehour = 23;
258    else alarmtimehour  --;
259  }
260
261
262  // adjust the alarm time (minute)
263
264  readbuttonminuteup  = digitalRead(buttonminuteup);
265  if (readbuttonminuteup == HIGH)
266  {
267    delay(100);
268    if (alarmtimeminute >= 59) alarmtimeminute = 0;
269    else alarmtimeminute  ++;
270  }
271
272
273  readbuttonminutedown = digitalRead(buttonminutedown);
274  if (readbuttonminutedown == HIGH)
275  {
276    delay(100);
277    if (alarmtimeminute  <= 0) alarmtimeminute = 59;
278    else alarmtimeminute --;
279  }
280
281  // write  alarmtime to EEPROM
282
283  EEPROM.write(0, alarmtimehour); // first character  = position, second character = value
284  EEPROM.write(1, alarmtimeminute);
285
286
287  // check alarm time
288
289  if ((now.hour() + DST) == alarmtimehour && now.minute()  == alarmtimeminute && now.second() == 0 && alarmstate == 1)
290  {
291    alarmtimeequaltime  = 1;
292  }
293
294  // activate alarm
295
296  if (alarmtimeequaltime == 1 && alarmstate  == 1)
297  // it is not possible to use the command "delay" - the display of the  seconds will stop
298  {
299    unsigned long currentMillis = millis();
300
301    if (currentMillis - previousMillis >= interval)
302    {
303      tone(buzzer,  1000);
304      if (currentMillis - previousMillis >= 2*interval)
305      {
306      previousMillis = currentMillis;
307      }
308    }
309  
310    else
311    {  
312    tone(buzzer, 300);
313    }
314  }
315  
316  if (alarmtimeequaltime  == 1 && alarmstate == 0)
317  {
318    noTone(buzzer);
319    alarmtimeequaltime  = 0;
320  }
321    
322}
323
324
325void clickedIt()
326{
327  alarmstate = !alarmstate;
328}
329

/* Alarm Clock
  by smi1100 - 06/06/2019
  My first project. The  following components are needed:
  - Arduino Uno
  - DS3231 real time clock
  - 20x4 I2C Display
  - buzzer
  - 5 buttons
  - 5 resistors 10k Ohm
  - bread board
  - casing


/* modul 0 - I2C Bus
  - I2C adresses
    - LCD 0x27
    - real time clock
      RTC DS3231 0x68
      EEPROM  AT24C32 0x57 (not in use)
*/

#include <Wire.h>


/* modul 1 -  DS3231 real time clock
  - connections (from right side) - GND, VCC, SDA, SCL
  - RTClib.h is required
  - I2C connection
*/

#include "RTClib.h"
RTC_DS1307  rtc;
char weekday[7][12] = {"Sonntag", "Montag", "Dienstag", "Mittwoch",  "Donnerst.", "Freitag", "Samstag"};
// in english char weekday[7][12] =  {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};


/*  modul 2 - Joy-IT SBC-LCD 20x4 display
  - 4 rows, 20 characters
  - connections  (from right side) - GND, VCC, SDA, SCL
  - LiquidCrystal_I2C.h is required
  - I2C connection
*/

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C  lcd(0x27, 20, 4); // adress 0x27
//LiquidCrystal_I2C lcd(0x3F,20,4); // if the  lcd is not working, change adress to 0x3F


/* modul 3 - buttons to adjust  the alarm time and button for the buzzer
*/

int buzzer = 4;
int buttonhourup  = A3;
int buttonhourdown = A2;
int buttonminuteup = A1;
int buttonminutedown  = A0;
int readbuttonhourup;
int readbuttonhourdown;
int readbuttonminuteup;
int  readbuttonminutedown;

// alarmtime
int alarmtimehour;
int alarmtimeminute;


/*  modul 4 - switch for alarm on/off
  - OneButton.h is required
  - see internet  resource https://www.makerblog.at/2015/01/arduino-und-pushbuttons-drucktaster-einbinden-mit-der-onebutton-library/
*/

#include  "OneButton.h"
int buttonalarm = 5;
OneButton button(buttonalarm, false);
int  alarmstate = 1;             // equal to alarm is on 
int alarmtimeequaltime =  0;     // active when alarm time is equal to time


/* modul 5 - EEPROM  - backup of alarmtime in the EEPROM
  - EEPROM.h is required
*/

#include  "EEPROM.h"


/* code 1 - summer or winter time
  - see internet resource  https://kaufma.net/blog/article/2016/08/24/sommerzeit-im-microcontroller/
  -  see internet resource https://electronicfreakblog.wordpress.com/2014/03/06/die-zeit-im-sommer-und-im-winter/
  DST = Daylight Saving Time, equal to summer time
*/

int DST;


/*  code 2 - changing buzzer sound
*/

unsigned long previousMillis = 0;
const  long interval = 1000;


void setup ()
{
  Serial.begin(9600);

  // read alarmtime from EEPROM

  alarmtimehour = EEPROM.read(0);
  alarmtimeminute  = EEPROM.read(1);


  // initialize DS3231 RTC

  Serial.begin(9600);
  while (!Serial); // for Leonardo/Micro/Zero

  if (! rtc.begin())
  {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if  (! rtc.isrunning())
  {
    // define format once
    Serial.println("RTC  is NOT running!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    Serial.println("RTC  adjusted!");
  }


  // initialize display

  lcd.init();
  lcd.backlight();


  // initialize buttons and buzzer

  pinMode(buttonhourup,  INPUT);
  pinMode(buttonhourdown, INPUT);
  pinMode(buttonminuteup, INPUT);
  pinMode(buttonminutedown, INPUT);
  pinMode(buzzer, OUTPUT);


  //  initialize button as a switch

  pinMode(buttonalarm, INPUT);
  button.attachClick(clickedIt);
  
}

void loop ()
{

//determine summer or winter time

int  DST;

DateTime now = rtc.now();

if (now.month() == 3  && now.day()  > 24 && now.dayOfTheWeek() == 1 && now.hour() >= 2 || //exakter Tag Beginn
    now.month()  == 3  && now.day() + 8 - now.dayOfTheWeek() > 31 && now.dayOfTheWeek() != 1 || //  restlichen Tage des Mrz
    now.month() >  3 && now.month() < 10 || //April bis  September
    now.month() == 10 && now.day() + 8 - now.dayOfTheWeek() < 32 ||  //Oktober bis Tag vor letztem Sonntag
    now.month() == 10 && now.day() > 24  && now.dayOfTheWeek() == 1 && now.hour() <= 3) //letzter Sonntag
    {
    DST  = 1;
    Serial.print("summertime - ");
    Serial.print("time: ");
    Serial.println(now.hour()+DST);
    }
else 
    {
    DST = 0;
    Serial.print("wintertime - ");
    Serial.print("time: ");
    Serial.println(now.hour());
   }


// button as a switch

  button.tick();
  delay(10);

//  shown data on the LCD

  lcd.setCursor(1, 0);

  lcd.print(weekday[now.dayOfTheWeek()]);
  lcd.print("   ");

  lcd.setCursor(13, 0);

  if (now.day() < 10)  lcd.print("0");            // less than 10 -> add 0 before it
  lcd.print(now.day(),  DEC);
  lcd.print(".");

  if (now.month() < 10) lcd.print("0");          //  less than 10 -> add 0 before it
  lcd.print(now.month(), DEC);
  //lcd.print(".");
  //lcd.print(now.year(), DEC);


  lcd.setCursor(0, 1);
  lcd.print("   Zeit      Alarm");
  // in english lcd.print("   time      alarm");

  lcd.setCursor(0, 2);

  lcd.print(" ");
  if ((now.hour() + DST) <  10) lcd.print("0");       // less than 10 -> add 0 before it
  lcd.print((now.hour()  + DST), DEC);
  lcd.print(":");

  if (now.minute() < 10) lcd.print("0");       // less than 10 -> add 0 before it
  lcd.print(now.minute(), DEC);
  lcd.print(":");

  if (now.second() < 10) lcd.print("0");       // less  than 10 -> add 0 before it
  lcd.print(now.second(), DEC);
  lcd.print("    ");

  if (alarmtimehour < 10) lcd.print("0");       // less than 10  -> add 0 before it
  lcd.print(alarmtimehour, DEC);
  lcd.print(':');

  if (alarmtimeminute < 10) lcd.print("0");       // less than 10 -> add 0 before  it
  lcd.print(alarmtimeminute, DEC);

  lcd.setCursor(14, 3);
  if  (alarmstate == 1)lcd.print("EIN");
  else lcd.print("AUS");
  /* in english  if (alarmstate == 1)lcd.print("ON");
  else lcd.print("OFF");
  */

  // adjust the alarm time (hour)

  readbuttonhourup = digitalRead(buttonhourup);

  if (readbuttonhourup == HIGH)
  {
    delay(100);
    if (alarmtimehour  >= 23) alarmtimehour = 0;
    else alarmtimehour ++;
  }


  readbuttonhourdown  = digitalRead(buttonhourdown);

  if (readbuttonhourdown == HIGH)
  {
    delay(100);
    if (alarmtimehour <= 0) alarmtimehour = 23;
    else alarmtimehour  --;
  }


  // adjust the alarm time (minute)

  readbuttonminuteup  = digitalRead(buttonminuteup);
  if (readbuttonminuteup == HIGH)
  {
    delay(100);
    if (alarmtimeminute >= 59) alarmtimeminute = 0;
    else alarmtimeminute  ++;
  }


  readbuttonminutedown = digitalRead(buttonminutedown);
  if (readbuttonminutedown == HIGH)
  {
    delay(100);
    if (alarmtimeminute  <= 0) alarmtimeminute = 59;
    else alarmtimeminute --;
  }

  // write  alarmtime to EEPROM

  EEPROM.write(0, alarmtimehour); // first character  = position, second character = value
  EEPROM.write(1, alarmtimeminute);


  // check alarm time

  if ((now.hour() + DST) == alarmtimehour && now.minute()  == alarmtimeminute && now.second() == 0 && alarmstate == 1)
  {
    alarmtimeequaltime  = 1;
  }

  // activate alarm

  if (alarmtimeequaltime == 1 && alarmstate  == 1)
  // it is not possible to use the command "delay" - the display of the  seconds will stop
  {
    unsigned long currentMillis = millis();

    if (currentMillis - previousMillis >= interval)
    {
      tone(buzzer,  1000);
      if (currentMillis - previousMillis >= 2*interval)
      {
      previousMillis = currentMillis;
      }
    }
  
    else
    {  
    tone(buzzer, 300);
    }
  }
  
  if (alarmtimeequaltime  == 1 && alarmstate == 0)
  {
    noTone(buzzer);
    alarmtimeequaltime  = 0;
  }
    
}


void clickedIt()
{
  alarmstate = !alarmstate;
}

Downloadable files

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Case - Backside

Case - Frontside

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