Arduino Digital Clock

Digital Clock without RTC

Mar 10, 2022

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embedded

smart appliances

smartwatches

Components and supplies

Pushbutton Switch, Pushbutton

Jumper wires (generic)

Alphanumeric LCD, 16 x 2

Breadboard (generic)

Single Turn Potentiometer- 10k ohms

Resistor 330 ohm

Arduino Nano R3

Tools and machines

Scissor, Electrician

Apps and platforms

Arduino IDE

Project description

Code

arduino

1// https://www.youtube.com/channel/UCaXI2PcsTlH5g0et67kdD6g  //
2//  Arduino Digital Clock //
3// By MOHD SOHAIL //
4
5#include <LiquidCrystal.h>
6
7LiquidCrystal  lcd(2,3,4,5,6,7);
8int s,m,h,a,d,state,state1,state2,dg,cnt;
9
10// the 8 arrays  that form each segment of the custom numbers
11byte bar1[8] = 
12{
13        B11100,
14        B11110,
15        B11110,
16        B11110,
17        B11110,
18        B11110,
19        B11110,
20        B11100
21};
22byte bar2[8] =
23{
24        B00111,
25        B01111,
26        B01111,
27        B01111,
28        B01111,
29        B01111,
30        B01111,
31        B00111
32};
33byte bar3[8] =
34{
35        B11111,
36        B11111,
37        B00000,
38        B00000,
39        B00000,
40        B00000,
41        B11111,
42        B11111
43};
44byte bar4[8] =
45{
46        B11110,
47        B11100,
48        B00000,
49        B00000,
50        B00000,
51        B00000,
52        B11000,
53        B11100
54};
55byte bar5[8] =
56{
57        B01111,
58        B00111,
59        B00000,
60        B00000,
61        B00000,
62        B00000,
63        B00011,
64        B00111
65};
66byte bar6[8] =
67{
68        B00000,
69        B00000,
70        B00000,
71        B00000,
72        B00000,
73        B00000,
74        B11111,
75        B11111
76};
77byte bar7[8] =
78{
79        B00000,
80        B00000,
81        B00000,
82        B00000,
83        B00000,
84        B00000,
85        B00111,
86        B01111
87};
88byte bar8[8] =
89{
90        B11111,
91        B11111,
92        B00000,
93        B00000,
94        B00000,
95        B00000,
96        B00000,
97        B00000
98};
99
100
101
102void setup()
103{
104  //  assignes each segment a write number
105  lcd.createChar(1,bar1);
106  lcd.createChar(2,bar2);
107  lcd.createChar(3,bar3);
108  lcd.createChar(4,bar4);
109  lcd.createChar(5,bar5);
110  lcd.createChar(6,bar6);
111  lcd.createChar(7,bar7);
112  lcd.createChar(8,bar8);
113  state=1;
114  state1=1;
115  state2=1;
116  // sets the LCD's rows and colums:
117  lcd.begin(16, 2);
118  pinMode(8,INPUT_PULLUP);
119    pinMode(9,INPUT_PULLUP);
120      pinMode(10,INPUT_PULLUP);
121  s=0;
122  m=0;
123   h=0;
124a=0;
125}
126
127void  custom0(int col)
128{ // uses segments to build the number 0
129  lcd.setCursor(col,  0); 
130  lcd.write(2);  
131  lcd.write(8); 
132  lcd.write(1);
133  lcd.setCursor(col,  1); 
134  lcd.write(2);  
135  lcd.write(6);  
136  lcd.write(1);
137}
138
139void  custom1(int col)
140{
141  lcd.setCursor(col,0);
142  lcd.write(32);
143  lcd.write(32);
144  lcd.write(1);
145  lcd.setCursor(col,1);
146  lcd.write(32);
147  lcd.write(32);
148  lcd.write(1);
149}
150
151void custom2(int col)
152{
153  lcd.setCursor(col,0);
154  lcd.write(5);
155  lcd.write(3);
156  lcd.write(1);
157  lcd.setCursor(col, 1);
158  lcd.write(2);
159  lcd.write(6);
160  lcd.write(6);
161}
162
163void custom3(int  col)
164{
165  lcd.setCursor(col,0);
166  lcd.write(5);
167  lcd.write(3);
168  lcd.write(1);
169  lcd.setCursor(col, 1);
170  lcd.write(7);
171  lcd.write(6);
172  lcd.write(1);  
173}
174
175void custom4(int col)
176{
177  lcd.setCursor(col,0);
178  lcd.write(2);
179  lcd.write(6);
180  lcd.write(1);
181  lcd.setCursor(col, 1);
182  lcd.write(32);
183  lcd.write(32);
184  lcd.write(1);
185}
186
187void custom5(int col)
188{
189  lcd.setCursor(col,0);
190  lcd.write(2);
191  lcd.write(3);
192  lcd.write(4);
193  lcd.setCursor(col, 1);
194  lcd.write(7);
195  lcd.write(6);
196  lcd.write(1);
197}
198
199void custom6(int  col)
200{
201  lcd.setCursor(col,0);
202  lcd.write(2);
203  lcd.write(3);
204  lcd.write(4);
205  lcd.setCursor(col, 1);
206  lcd.write(2);
207  lcd.write(6);
208  lcd.write(1);
209}
210
211void  custom7(int col)
212{
213  lcd.setCursor(col,0);
214  lcd.write(2);
215  lcd.write(8);
216  lcd.write(1);
217  lcd.setCursor(col, 1);
218  lcd.write(32);
219  lcd.write(32);
220  lcd.write(1);
221}
222
223void custom8(int col)
224{
225  lcd.setCursor(col, 0);  
226  lcd.write(2);  
227  lcd.write(3); 
228  lcd.write(1);
229  lcd.setCursor(col,  1); 
230  lcd.write(2);  
231  lcd.write(6);  
232  lcd.write(1);
233}
234
235void  custom9(int col)
236{
237  lcd.setCursor(col, 0); 
238  lcd.write(2);  
239  lcd.write(3);  
240  lcd.write(1);
241  lcd.setCursor(col, 1); 
242  lcd.write(7);  
243  lcd.write(6);  
244  lcd.write(1);
245}
246
247void printNumber(int value, int col) {
248  if  (value == 0) {
249    custom0(col);
250  } if (value == 1) {
251    custom1(col);
252  } if (value == 2) {
253    custom2(col);
254  } if (value == 3) {
255    custom3(col);
256  } if (value == 4) {
257    custom4(col);
258  } if (value == 5) {
259    custom5(col);
260  } if (value == 6) {
261    custom6(col);
262  } if (value == 7) {
263    custom7(col);
264  } if (value == 8) {
265    custom8(col);
266  } if (value == 9) {
267    custom9(col);
268  }      
269}  
270
271
272  
273 
274 
275  
276 
277
278
279
280
281void loop()
282
283{
284  if(!digitalRead(8)&state==1){
285    cnt++;
286    state=0;
287    if(cnt>3){
288      cnt=0;
289      }
290    }else if(digitalRead(8)&state==0){
291    state=1;
292    }
293
294if(!digitalRead(9)&&state1==1){
295    dg=1;
296    state1=0;
297     
298    }else if(digitalRead(9)&state1==0){
299    state1=1;
300    }
301
302if(!digitalRead(10)&&state2==1){
303     dg=-1;
304     state2=0;
305    }else if(digitalRead(10)&state2==0){
306    state2=1;
307    }
308    switch(cnt){
309      case 1:
310      m=m+dg;
311      dg=0;  if(m>59){
312    m=59;}
313    if(m<0){
314    m=0;}
315      break;
316     
317      case 2:
318      h=h+dg;
319      dg=0;if(h>11){
320    h=11;}
321    if(h<0){
322    h=0;}
323      break;
324          case 3:
325     if(dg==1){
326    a=1;
327    dg=0;}
328     if(dg==-1){
329    a=0;
330    dg=0;}
331      break;
332      }
333  if(s>59){
334    s=0;
335    m++;
336  
337  if(m>59){
338    m=0;
339   h++;
340  
341  if(h>11){
342    h=0;
343    a=!a;
344  } 
345  }
346  }
347  d=h%10;
348  printNumber(d, 3);
349  d=h/10;
350   printNumber(d, 0);
351
352       d=m%10;
353     printNumber(d,  10);
354     d=m/10;
355     printNumber(d, 7);
356     lcd.setCursor(14, 0);
357     if(a){
358       lcd.print("AM");
359      }else{
360         lcd.print("PM");
361        }
362        if(cnt==0){
363           s++;
364          lcd.setCursor(6,  0);
365      lcd.print(" ");
366       lcd.setCursor(6, 1);
367      lcd.print("  ");
368      delay(500);
369    lcd.setCursor(6, 0);
370      lcd.print(".");
371       lcd.setCursor(6, 1);
372      lcd.print(".");
373      delay(500);
374       }
375}  
376

// https://www.youtube.com/channel/UCaXI2PcsTlH5g0et67kdD6g  //
//  Arduino Digital Clock //
// By MOHD SOHAIL //

#include <LiquidCrystal.h>

LiquidCrystal  lcd(2,3,4,5,6,7);
int s,m,h,a,d,state,state1,state2,dg,cnt;

// the 8 arrays  that form each segment of the custom numbers
byte bar1[8] = 
{
        B11100,
        B11110,
        B11110,
        B11110,
        B11110,
        B11110,
        B11110,
        B11100
};
byte bar2[8] =
{
        B00111,
        B01111,
        B01111,
        B01111,
        B01111,
        B01111,
        B01111,
        B00111
};
byte bar3[8] =
{
        B11111,
        B11111,
        B00000,
        B00000,
        B00000,
        B00000,
        B11111,
        B11111
};
byte bar4[8] =
{
        B11110,
        B11100,
        B00000,
        B00000,
        B00000,
        B00000,
        B11000,
        B11100
};
byte bar5[8] =
{
        B01111,
        B00111,
        B00000,
        B00000,
        B00000,
        B00000,
        B00011,
        B00111
};
byte bar6[8] =
{
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B11111,
        B11111
};
byte bar7[8] =
{
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00111,
        B01111
};
byte bar8[8] =
{
        B11111,
        B11111,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000
};



void setup()
{
  //  assignes each segment a write number
  lcd.createChar(1,bar1);
  lcd.createChar(2,bar2);
  lcd.createChar(3,bar3);
  lcd.createChar(4,bar4);
  lcd.createChar(5,bar5);
  lcd.createChar(6,bar6);
  lcd.createChar(7,bar7);
  lcd.createChar(8,bar8);
  state=1;
  state1=1;
  state2=1;
  // sets the LCD's rows and colums:
  lcd.begin(16, 2);
  pinMode(8,INPUT_PULLUP);
    pinMode(9,INPUT_PULLUP);
      pinMode(10,INPUT_PULLUP);
  s=0;
  m=0;
   h=0;
a=0;
}

void  custom0(int col)
{ // uses segments to build the number 0
  lcd.setCursor(col,  0); 
  lcd.write(2);  
  lcd.write(8); 
  lcd.write(1);
  lcd.setCursor(col,  1); 
  lcd.write(2);  
  lcd.write(6);  
  lcd.write(1);
}

void  custom1(int col)
{
  lcd.setCursor(col,0);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
  lcd.setCursor(col,1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom2(int col)
{
  lcd.setCursor(col,0);
  lcd.write(5);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(6);
}

void custom3(int  col)
{
  lcd.setCursor(col,0);
  lcd.write(5);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(6);
  lcd.write(1);  
}

void custom4(int col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom5(int col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(4);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(6);
  lcd.write(1);
}

void custom6(int  col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(4);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
}

void  custom7(int col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(8);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom8(int col)
{
  lcd.setCursor(col, 0);  
  lcd.write(2);  
  lcd.write(3); 
  lcd.write(1);
  lcd.setCursor(col,  1); 
  lcd.write(2);  
  lcd.write(6);  
  lcd.write(1);
}

void  custom9(int col)
{
  lcd.setCursor(col, 0); 
  lcd.write(2);  
  lcd.write(3);  
  lcd.write(1);
  lcd.setCursor(col, 1); 
  lcd.write(7);  
  lcd.write(6);  
  lcd.write(1);
}

void printNumber(int value, int col) {
  if  (value == 0) {
    custom0(col);
  } if (value == 1) {
    custom1(col);
  } if (value == 2) {
    custom2(col);
  } if (value == 3) {
    custom3(col);
  } if (value == 4) {
    custom4(col);
  } if (value == 5) {
    custom5(col);
  } if (value == 6) {
    custom6(col);
  } if (value == 7) {
    custom7(col);
  } if (value == 8) {
    custom8(col);
  } if (value == 9) {
    custom9(col);
  }      
}  


  
 
 
  
 




void loop()

{
  if(!digitalRead(8)&state==1){
    cnt++;
    state=0;
    if(cnt>3){
      cnt=0;
      }
    }else if(digitalRead(8)&state==0){
    state=1;
    }

if(!digitalRead(9)&&state1==1){
    dg=1;
    state1=0;
     
    }else if(digitalRead(9)&state1==0){
    state1=1;
    }

if(!digitalRead(10)&&state2==1){
     dg=-1;
     state2=0;
    }else if(digitalRead(10)&state2==0){
    state2=1;
    }
    switch(cnt){
      case 1:
      m=m+dg;
      dg=0;  if(m>59){
    m=59;}
    if(m<0){
    m=0;}
      break;
     
      case 2:
      h=h+dg;
      dg=0;if(h>11){
    h=11;}
    if(h<0){
    h=0;}
      break;
          case 3:
     if(dg==1){
    a=1;
    dg=0;}
     if(dg==-1){
    a=0;
    dg=0;}
      break;
      }
  if(s>59){
    s=0;
    m++;
  
  if(m>59){
    m=0;
   h++;
  
  if(h>11){
    h=0;
    a=!a;
  } 
  }
  }
  d=h%10;
  printNumber(d, 3);
  d=h/10;
   printNumber(d, 0);

       d=m%10;
     printNumber(d,  10);
     d=m/10;
     printNumber(d, 7);
     lcd.setCursor(14, 0);
     if(a){
       lcd.print("AM");
      }else{
         lcd.print("PM");
        }
        if(cnt==0){
           s++;
          lcd.setCursor(6,  0);
      lcd.print(" ");
       lcd.setCursor(6, 1);
      lcd.print("  ");
      delay(500);
    lcd.setCursor(6, 0);
      lcd.print(".");
       lcd.setCursor(6, 1);
      lcd.print(".");
      delay(500);
       }
}

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Circuit Diagram

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