Arduino 'Clock' with LCD (20x4) I2C

User inputs the current date/time into the Serial Monitor and the 'clock' starts on the LCD!

Jun 29, 2022

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clocks

Components and supplies

Jumper wires (generic)

I2C 16x2 Arduino LCD Display Module

Arduino UNO

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Arduino IDE

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Latest commit to the master branch on Invalid date

Download as a zip

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arduino

1/* Arduino 'Clock' with LCD (20x4) I2C.
2
3   This I2C LCD backpack  contains the PCF8574 port-expander
4   IC. Beware that this sketch can work with  backpacks that
5   contains this IC, but may not work with variations.
6
7   Components:
8                - Arduino Uno
9                - LCD I2C (20x4)
10
11   Libraries:
12                - LiquidCrystal_I2C library
13
14   Created on  25 June 2022 by c010rblind3ngineer
15*/
16
17#include <LiquidCrystal_I2C.h>
18
19LiquidCrystal_I2C  lcd(0x27, 20, 4);
20
21const int a_sec = 900; // clock second hand
22
23int  Hrs, Mins;
24int Secs = 0;
25String AmPm;  // to store the string data to display  'AM' or 'PM'
26int ampm;     // to store user input
27int day, d, m, yr;
28char  *DAYS[] = {"Mon", "Tues", "Wed", "Thurs", "Fri", "Sat", "Sun"};
29char  *MONTHS[] = {"Jan", "Feb", "Mar", "Apr", "May", "June",
30                  "July",  "Aug", "Sep", "Oct", "Nov", "Dec"
31                 };
32
33void setup()
34{
35  Serial.begin(9600);
36  lcd.init();
37  lcd.backlight();
38  clkInit();
39}
40void  loop()
41{
42  //...Display Time to LCD...
43  lcd.setCursor(0, 1);
44  lcd.print("Time:  ");
45  printolcd(Hrs);
46  lcd.print(":");
47  printolcd(Mins);
48  lcd.print(":");
49  printolcd(Secs);
50  lcd.print(AmPm);
51
52  //...Clock starts...
53  Secs++;
54  if (Secs == 60) {
55    Secs = 0;
56    Mins++;
57  }
58  if (Mins == 60)  {
59    Mins = 0;
60    Hrs++;
61  }
62  if (Hrs == 13) {
63    Hrs = 1;
64  }
65  if (Hrs == 12 && Mins == 00 && Secs == 00) {
66    if (AmPm == "AM")  {
67      AmPm = "PM";
68    }
69    else {
70      AmPm = "AM";
71      d++;
72      reset_dom(m); // reset the day to 1 when the days of the month exceed it's  limit
73
74      //...Reset LCD row 0 and update date...
75      lcd.setCursor(0,  0);
76      lcd.print("                    ");
77      lcd.setCursor(0, 0);
78      lcd.print(DAYS[day]);   // mon, tues, wed... etc.
79      lcd.print(", ");
80      printolcd(d);
81      lcd.print(" ");
82      lcd.print(MONTHS[m - 1]);
83      lcd.print(" ");
84      lcd.print(yr);
85      day++;
86    }
87  }
88  delay(a_sec);  // delay acts as the clock second hand
89}
90
91
92///////////////////////////////////////
93////Initialise  the 'clock' settings////
94///////////////////////////////////////
95void clkInit()  {
96
97  Serial.println("What is the day today? (1 - 7)");
98  Serial.println("\	(1)  Monday\
99\	(2) Tuesday\
100\	(3) Wednesday\
101\	(4) Thursday\
102\	(5) Friday\
103\	(6)  Saturday\
104\	(7) Sunday");
105  while (Serial.available() == 0) {}; // wait for  user input
106  day = Serial.parseInt(); // store what day is today in integer variable  'day'
107
108  delay(500);
109
110  Serial.println("\
111What is today's date?");
112  Serial.print("Day (1 - 31): ");
113  while (Serial.available() == 0) {}; //  wait for user input
114  d = Serial.parseInt();  // store day in integer variable  'd'
115  printoserial(d);
116
117  Serial.print("\
118Month (1 - 12): ");
119  while  (Serial.available() == 0) {}; // wait for user input
120  m = Serial.parseInt();  // store month in integer variable 'm'
121  Serial.print(MONTHS[m - 1]);
122  Serial.print("\
123Year  (YYYY): ");
124  while (Serial.available() == 0) {}; // wait for user input
125  yr = Serial.parseInt(); // store year in integer variable 'yr'
126  Serial.print(yr);
127
128  delay(500);
129
130  Serial.print("\
131\
132\	Today is ");
133  Serial.print(DAYS[day  - 1]);
134  Serial.print(", ");
135  printoserial(d);
136  Serial.print(" ");
137  Serial.print(MONTHS[m - 1]);
138  Serial.print(" ");
139  Serial.print(yr);
140  Serial.print("\
141\
142Is it - (1)AM or (2)PM ?");
143  while (Serial.available()  == 0) {};
144  ampm = Serial.parseInt();
145
146  delay(500);
147
148  if (ampm  == 1) {
149    AmPm = "AM";
150    Serial.print("\
151Clock set to AM\
152\
153");
154  }
155  if (ampm == 2) {
156    AmPm = "PM";
157    Serial.print("\
158Clock set  to PM\
159\
160");
161  }
162
163  delay(500);
164
165  Serial.print("Input Hours  (1 - 12) : ");
166  while (Serial.available() == 0) {} // wait till the user inputs  data
167  Hrs = Serial.parseInt();
168  printoserial(Hrs);
169
170  delay(500);
171
172  Serial.print("\
173Input Minutes (0 - 59) : ");
174  while (Serial.available()  == 0) {} // wait till the user inputs data
175  Mins = Serial.parseInt();
176  printoserial(Mins);
177
178  delay(500);
179
180  Serial.print("\
181\
182\	Clock set to :  ");
183
184  //...Display  time to Serial Monitor...
185  printoserial(Hrs);
186  Serial.print(":");
187  printoserial(Mins);
188  Serial.print(AmPm);
189
190  //... Display Date to LCD...
191  lcd.setCursor(0, 0);
192  lcd.print(DAYS[day - 1]);
193  lcd.print(", ");
194  printolcd(d);
195  lcd.print(" ");
196  lcd.print(MONTHS[m - 1]);
197  lcd.print("  ");
198  lcd.print(yr);
199}
200
201
202//////////////////////////////////////////////////////////////////////////
203////To  put an extra '0' infront of the variables on the Serial Monitor////
204//////////////////////////////////////////////////////////////////////////
205void  printoserial(int val)
206{
207  if (val < 10) {
208    Serial.print("0");
209    Serial.print(val);
210  }
211  else {
212    Serial.print(val);
213  }
214}
215
216///////////////////////////////////////////////////////////////
217////To  put an extra '0' infront of the variables on the LCD////
218///////////////////////////////////////////////////////////////
219void  printolcd(int val)
220{
221  if (val < 10) {
222    lcd.print("0");
223    lcd.print(val);
224  }
225  else {
226    lcd.print(val);
227  }
228}
229
230void reset_dom(int var)  {
231  switch (var) {
232    case 1:   // Jan - 31 days
233      if (d == 32) {
234        d = 1;
235        m++;
236      }
237      break;
238    case 2:   // Feb  - 28 days
239      if (d == 29) {
240        d = 1;
241        m++;
242      }
243      break;
244    case 3:   // March - 31 days
245      if (d == 32) {
246        d  = 1;
247        m++;
248      }
249      break;
250    case 4:   // April - 30 days
251      if (d == 31) {
252        d = 1;
253        m++;
254      }
255      break;
256    case 5:   // May - 31 days
257      if (d == 32) {
258        d = 1;
259        m++;
260      }
261      break;
262    case 6:   // June - 30 days
263      if (d == 31)  {
264        d = 1;
265        m++;
266      }
267      break;
268    case 7:   //  July - 31 days
269      if (d == 32) {
270        d = 1;
271        m++;
272      }
273      break;
274    case 8:   // August - 31 days
275      if (d == 32) {
276        d  = 1;
277        m++;
278      }
279      break;
280    case 9:   // September -  30 days
281      if (d == 31) {
282        d = 1;
283        m++;
284      }
285      break;
286    case 10:  // October - 31 days
287      if (d == 32) {
288        d  = 1;
289        m++;
290      }
291      break;
292    case 11:  // November - 30  days
293      if (d == 31) {
294        d = 1;
295        m++;
296      }
297      break;
298    case 12:  // December - 31 days
299      if (d == 32) {
300        d = 1;
301        m++;
302      }
303      break;
304  }
305}
306

/* Arduino 'Clock' with LCD (20x4) I2C.

   This I2C LCD backpack  contains the PCF8574 port-expander
   IC. Beware that this sketch can work with  backpacks that
   contains this IC, but may not work with variations.

   Components:
                - Arduino Uno
                - LCD I2C (20x4)

   Libraries:
                - LiquidCrystal_I2C library

   Created on  25 June 2022 by c010rblind3ngineer
*/

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C  lcd(0x27, 20, 4);

const int a_sec = 900; // clock second hand

int  Hrs, Mins;
int Secs = 0;
String AmPm;  // to store the string data to display  'AM' or 'PM'
int ampm;     // to store user input
int day, d, m, yr;
char  *DAYS[] = {"Mon", "Tues", "Wed", "Thurs", "Fri", "Sat", "Sun"};
char  *MONTHS[] = {"Jan", "Feb", "Mar", "Apr", "May", "June",
                  "July",  "Aug", "Sep", "Oct", "Nov", "Dec"
                 };

void setup()
{
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  clkInit();
}
void  loop()
{
  //...Display Time to LCD...
  lcd.setCursor(0, 1);
  lcd.print("Time:  ");
  printolcd(Hrs);
  lcd.print(":");
  printolcd(Mins);
  lcd.print(":");
  printolcd(Secs);
  lcd.print(AmPm);

  //...Clock starts...
  Secs++;
  if (Secs == 60) {
    Secs = 0;
    Mins++;
  }
  if (Mins == 60)  {
    Mins = 0;
    Hrs++;
  }
  if (Hrs == 13) {
    Hrs = 1;
  }
  if (Hrs == 12 && Mins == 00 && Secs == 00) {
    if (AmPm == "AM")  {
      AmPm = "PM";
    }
    else {
      AmPm = "AM";
      d++;
      reset_dom(m); // reset the day to 1 when the days of the month exceed it's  limit

      //...Reset LCD row 0 and update date...
      lcd.setCursor(0,  0);
      lcd.print("                    ");
      lcd.setCursor(0, 0);
      lcd.print(DAYS[day]);   // mon, tues, wed... etc.
      lcd.print(", ");
      printolcd(d);
      lcd.print(" ");
      lcd.print(MONTHS[m - 1]);
      lcd.print(" ");
      lcd.print(yr);
      day++;
    }
  }
  delay(a_sec);  // delay acts as the clock second hand
}


///////////////////////////////////////
////Initialise  the 'clock' settings////
///////////////////////////////////////
void clkInit()  {

  Serial.println("What is the day today? (1 - 7)");
  Serial.println("\	(1)  Monday\
\	(2) Tuesday\
\	(3) Wednesday\
\	(4) Thursday\
\	(5) Friday\
\	(6)  Saturday\
\	(7) Sunday");
  while (Serial.available() == 0) {}; // wait for  user input
  day = Serial.parseInt(); // store what day is today in integer variable  'day'

  delay(500);

  Serial.println("\
What is today's date?");
  Serial.print("Day (1 - 31): ");
  while (Serial.available() == 0) {}; //  wait for user input
  d = Serial.parseInt();  // store day in integer variable  'd'
  printoserial(d);

  Serial.print("\
Month (1 - 12): ");
  while  (Serial.available() == 0) {}; // wait for user input
  m = Serial.parseInt();  // store month in integer variable 'm'
  Serial.print(MONTHS[m - 1]);
  Serial.print("\
Year  (YYYY): ");
  while (Serial.available() == 0) {}; // wait for user input
  yr = Serial.parseInt(); // store year in integer variable 'yr'
  Serial.print(yr);

  delay(500);

  Serial.print("\
\
\	Today is ");
  Serial.print(DAYS[day  - 1]);
  Serial.print(", ");
  printoserial(d);
  Serial.print(" ");
  Serial.print(MONTHS[m - 1]);
  Serial.print(" ");
  Serial.print(yr);
  Serial.print("\
\
Is it - (1)AM or (2)PM ?");
  while (Serial.available()  == 0) {};
  ampm = Serial.parseInt();

  delay(500);

  if (ampm  == 1) {
    AmPm = "AM";
    Serial.print("\
Clock set to AM\
\
");
  }
  if (ampm == 2) {
    AmPm = "PM";
    Serial.print("\
Clock set  to PM\
\
");
  }

  delay(500);

  Serial.print("Input Hours  (1 - 12) : ");
  while (Serial.available() == 0) {} // wait till the user inputs  data
  Hrs = Serial.parseInt();
  printoserial(Hrs);

  delay(500);

  Serial.print("\
Input Minutes (0 - 59) : ");
  while (Serial.available()  == 0) {} // wait till the user inputs data
  Mins = Serial.parseInt();
  printoserial(Mins);

  delay(500);

  Serial.print("\
\
\	Clock set to :  ");

  //...Display  time to Serial Monitor...
  printoserial(Hrs);
  Serial.print(":");
  printoserial(Mins);
  Serial.print(AmPm);

  //... Display Date to LCD...
  lcd.setCursor(0, 0);
  lcd.print(DAYS[day - 1]);
  lcd.print(", ");
  printolcd(d);
  lcd.print(" ");
  lcd.print(MONTHS[m - 1]);
  lcd.print("  ");
  lcd.print(yr);
}


//////////////////////////////////////////////////////////////////////////
////To  put an extra '0' infront of the variables on the Serial Monitor////
//////////////////////////////////////////////////////////////////////////
void  printoserial(int val)
{
  if (val < 10) {
    Serial.print("0");
    Serial.print(val);
  }
  else {
    Serial.print(val);
  }
}

///////////////////////////////////////////////////////////////
////To  put an extra '0' infront of the variables on the LCD////
///////////////////////////////////////////////////////////////
void  printolcd(int val)
{
  if (val < 10) {
    lcd.print("0");
    lcd.print(val);
  }
  else {
    lcd.print(val);
  }
}

void reset_dom(int var)  {
  switch (var) {
    case 1:   // Jan - 31 days
      if (d == 32) {
        d = 1;
        m++;
      }
      break;
    case 2:   // Feb  - 28 days
      if (d == 29) {
        d = 1;
        m++;
      }
      break;
    case 3:   // March - 31 days
      if (d == 32) {
        d  = 1;
        m++;
      }
      break;
    case 4:   // April - 30 days
      if (d == 31) {
        d = 1;
        m++;
      }
      break;
    case 5:   // May - 31 days
      if (d == 32) {
        d = 1;
        m++;
      }
      break;
    case 6:   // June - 30 days
      if (d == 31)  {
        d = 1;
        m++;
      }
      break;
    case 7:   //  July - 31 days
      if (d == 32) {
        d = 1;
        m++;
      }
      break;
    case 8:   // August - 31 days
      if (d == 32) {
        d  = 1;
        m++;
      }
      break;
    case 9:   // September -  30 days
      if (d == 31) {
        d = 1;
        m++;
      }
      break;
    case 10:  // October - 31 days
      if (d == 32) {
        d  = 1;
        m++;
      }
      break;
    case 11:  // November - 30  days
      if (d == 31) {
        d = 1;
        m++;
      }
      break;
    case 12:  // December - 31 days
      if (d == 32) {
        d = 1;
        m++;
      }
      break;
  }
}

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