7 Segment Clock Using Arduino

Hey guys iam back with a project which is the 7 segment clock using arduino, iam conveying my thoughts and all other things to make this

May 4, 2021

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32046 views

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9 respects

Components and supplies

Female Header 8 Position 1 Row (0.1")

Dot Pcb

Male-Header 36 Position 1 Row- Long (0.1")

Tactile Switch, Top Actuated

Arduino Nano R3

116

5 mm LED: Red

Hook Up Wire Kit, 22 AWG

Tools and machines

Solder Wire, Lead Free

Soldering iron (generic)

PCB Holder, Soldering Iron

Solder Flux, Soldering

Apps and platforms

Arduino IDE

Project description

Code

Arduino Code

c_cpp

7 Segment Led Clock

1//feel free to contact
2//sreeramaj53@gmail.com
3//www.youtube.com/ZenoModiff
4
5#include  <TimeLib.h>
6int digit1 = 10;
7int digit2 = 11; 
8int digit3 = 12; 
9int  digit4 = 13; 
10
11int segA = 8;//Display pin A
12int segB = 7;//splay pin b
13int  segC = 6; //Display pin c
14int segD = 5; //Display pin d
15int segE = 4; //Display  pin e
16int segF = 3; //Display pin f
17int segG = 2; //Display pin g
18int segDP  = 9;// Display pin dot
19
20byte SW0 = A0;
21byte SW1 = A1;
22byte SW2 = A2;
23
24void  setup() {
25
26  pinMode(segA, OUTPUT);
27  pinMode(segB, OUTPUT);
28  pinMode(segC,  OUTPUT);
29  pinMode(segD, OUTPUT);
30  pinMode(segE, OUTPUT);
31  pinMode(segF,  OUTPUT);
32  pinMode(segG, OUTPUT);
33  pinMode(segDP, OUTPUT);
34
35  pinMode(digit1,  OUTPUT);
36  pinMode(digit2, OUTPUT);
37  pinMode(digit3, OUTPUT);
38  pinMode(digit4,  OUTPUT);
39
40 Serial.begin(9600);
41
42  pinMode(SW0, INPUT);  
43  pinMode(SW1,  INPUT);  
44  pinMode(SW2, INPUT);  
45
46  digitalWrite(SW0, HIGH); 
47  digitalWrite(SW1,  HIGH);
48  digitalWrite(SW2, HIGH);
49}
50
51void loop() {
52   digitalWrite(segDP,  HIGH);
53   int hr = hour();
54  int timp = ( (hr>12)?(hr%12):hr)*100+minute();
55  Serial.println(timp);
56  
57   for(int i = 250 ; i >0  ; i--) {
58     if  (timp > 100) displayNumber01(timp);
59     else displayNumber02(timp);
60   }
61
62   for(int i = 250 ; i >0  ; i--) {
63     if (timp > 100) displayNumber03(timp);
64     else displayNumber04(timp);
65   }
66
67  if (!(digitalRead(SW0))) set_time();
68}
69
70void  set_time()   {
71  byte minutes1 = 0;
72  byte hours1 = 0;
73  byte minutes =  minute();
74  byte hours = hour();
75
76  while (!digitalRead(SW0)) 
77  {
78    minutes1=minutes;
79    hours1=hours;
80
81  while (!digitalRead(SW1)) 
82    {
83     minutes++;
84
85    if (minutes > 59) minutes = 0;
86     for(int  i = 20 ; i >0  ; i--) {
87       int timp= hours*100+minutes;
88     if (timp  > 1000) displayNumber01(timp);
89     else displayNumber02(timp);
90     }
91
92   delay(150);
93    }
94
95    while (!digitalRead(SW2))
96    {
97     hours++;
98
99     if (hours > 12) hours = 0;
100
101     for(int i = 20 ; i >0  ; i--) {
102     int timp= hours*100+minutes;
103     if (timp > 1000) displayNumber01(timp);
104     else displayNumber02(timp);
105     }
106
107     delay(150);
108    }
109
110     for(int i = 20 ; i >0  ; i--) {
111     displayNumber01(hours*100+minutes);
112     }
113     setTime(hours,minutes,0,0,0,0);
114   delay(150);
115
116  }
117
118}
119
120void  displayNumber01(int toDisplay) {
121#define DISPLAY_BRIGHTNESS  500
122
123#define  DIGIT_ON  HIGH
124#define DIGIT_OFF  LOW
125
126  for(int digit = 4 ; digit > 0  ; digit--) {
127
128  
129    switch(digit) {
130    case 1:
131     digitalWrite(digit1,  DIGIT_ON);
132     digitalWrite(segDP, LOW);
133      break;
134   case 2:
135      digitalWrite(digit2,  DIGIT_ON);
136      digitalWrite(segDP, LOW);
137      break;
138    case 3:
139      digitalWrite(digit3, DIGIT_ON);
140      digitalWrite(segDP, LOW);
141      break;
142    case 4:
143      digitalWrite(digit4, DIGIT_ON);
144      digitalWrite(segDP,  LOW);
145      break;
146    }
147    lightNumber(toDisplay % 10);
148    toDisplay  /= 10;
149    delayMicroseconds(DISPLAY_BRIGHTNESS);
150
151  
152    lightNumber(10);
153
154    
155    digitalWrite(digit1, DIGIT_OFF);
156    digitalWrite(digit2, DIGIT_OFF);
157    digitalWrite(digit3, DIGIT_OFF);
158    digitalWrite(digit4, DIGIT_OFF);
159}
160}
161
162void  displayNumber02(int toDisplay) {
163#define DISPLAY_BRIGHTNESS  500
164
165#define  DIGIT_ON  HIGH
166#define DIGIT_OFF  LOW
167
168  for(int digit = 4 ; digit > 0  ; digit--) {
169
170   
171    switch(digit) {
172    case 1:
173     lightNumber(10);
174     digitalWrite(segDP, LOW);
175     break;
176   case 2:
177      digitalWrite(digit2,  DIGIT_ON);
178      digitalWrite(segDP, LOW);
179      break;
180    case 3:
181      digitalWrite(digit3, DIGIT_ON);
182      digitalWrite(segDP, LOW);
183      break;
184    case 4:
185      digitalWrite(digit4, DIGIT_ON);
186      digitalWrite(segDP,  LOW);
187      break;
188    }
189    lightNumber(toDisplay % 10);
190    toDisplay  /= 10;
191    delayMicroseconds(DISPLAY_BRIGHTNESS);
192
193    
194    lightNumber(10);
195
196    
197    digitalWrite(digit1, DIGIT_OFF);
198    digitalWrite(digit2, DIGIT_OFF);
199    digitalWrite(digit3, DIGIT_OFF);
200    digitalWrite(digit4, DIGIT_OFF);
201}
202}
203
204void  displayNumber03(int toDisplay) {
205#define DISPLAY_BRIGHTNESS  500
206
207#define  DIGIT_ON  HIGH
208#define DIGIT_OFF  LOW
209
210  for(int digit = 4 ; digit > 0  ; digit--) {
211
212    
213    switch(digit) {
214    case 1:
215     digitalWrite(digit1,  DIGIT_ON);
216     digitalWrite(segDP, HIGH);
217      break;
218   case 2:
219      digitalWrite(digit2, DIGIT_ON);
220      digitalWrite(segDP, HIGH);
221      break;
222    case 3:
223      digitalWrite(digit3, DIGIT_ON);
224      digitalWrite(segDP,  HIGH);
225      break;
226    case 4:
227      digitalWrite(digit4, DIGIT_ON);
228      digitalWrite(segDP, HIGH);
229      break;
230    }
231    lightNumber(toDisplay  % 10);
232    toDisplay /= 10;
233    delayMicroseconds(DISPLAY_BRIGHTNESS);
234
235    
236    lightNumber(10);
237
238   
239    digitalWrite(digit1, DIGIT_OFF);
240    digitalWrite(digit2, DIGIT_OFF);
241    digitalWrite(digit3, DIGIT_OFF);
242    digitalWrite(digit4, DIGIT_OFF);
243}
244}
245
246void displayNumber04(int toDisplay)  {
247#define DISPLAY_BRIGHTNESS  500
248
249#define DIGIT_ON  HIGH
250#define DIGIT_OFF  LOW
251
252  for(int digit = 4 ; digit > 0 ; digit--) {
253
254    
255    switch(digit)  {
256    case 1:
257     lightNumber(10);
258     digitalWrite(segDP, HIGH);
259     break;
260   case 2:
261      digitalWrite(digit2, DIGIT_ON);
262      digitalWrite(segDP,  HIGH);
263      break;
264    case 3:
265      digitalWrite(digit3, DIGIT_ON);
266      digitalWrite(segDP, HIGH);
267      break;
268    case 4:
269      digitalWrite(digit4,  DIGIT_ON);
270      digitalWrite(segDP, HIGH);
271      break;
272    }
273    lightNumber(toDisplay  % 10);
274    toDisplay /= 10;
275    delayMicroseconds(DISPLAY_BRIGHTNESS);
276
277    lightNumber(10);
278
279    digitalWrite(digit1, DIGIT_OFF);
280    digitalWrite(digit2,  DIGIT_OFF);
281    digitalWrite(digit3, DIGIT_OFF);
282    digitalWrite(digit4,  DIGIT_OFF);
283}
284}
285
286void lightNumber(int numberToDisplay) {
287
288#define  SEGMENT_ON  LOW
289#define SEGMENT_OFF HIGH
290
291  switch (numberToDisplay){
292
293  case 0:
294    digitalWrite(segA, SEGMENT_ON);
295    digitalWrite(segB, SEGMENT_ON);
296    digitalWrite(segC, SEGMENT_ON);
297    digitalWrite(segD, SEGMENT_ON);
298    digitalWrite(segE,  SEGMENT_ON);
299    digitalWrite(segF, SEGMENT_ON);
300    digitalWrite(segG, SEGMENT_OFF);
301    break;
302
303  case 1:
304    digitalWrite(segA, SEGMENT_OFF);
305    digitalWrite(segB,  SEGMENT_ON);
306    digitalWrite(segC, SEGMENT_ON);
307    digitalWrite(segD, SEGMENT_OFF);
308    digitalWrite(segE, SEGMENT_OFF);
309    digitalWrite(segF, SEGMENT_OFF);
310    digitalWrite(segG, SEGMENT_OFF);
311    break;
312
313  case 2:
314    digitalWrite(segA,  SEGMENT_ON);
315    digitalWrite(segB, SEGMENT_ON);
316    digitalWrite(segC, SEGMENT_OFF);
317    digitalWrite(segD, SEGMENT_ON);
318    digitalWrite(segE, SEGMENT_ON);
319    digitalWrite(segF,  SEGMENT_OFF);
320    digitalWrite(segG, SEGMENT_ON);
321    break;
322
323  case  3:
324    digitalWrite(segA, SEGMENT_ON);
325    digitalWrite(segB, SEGMENT_ON);
326    digitalWrite(segC, SEGMENT_ON);
327    digitalWrite(segD, SEGMENT_ON);
328    digitalWrite(segE,  SEGMENT_OFF);
329    digitalWrite(segF, SEGMENT_OFF);
330    digitalWrite(segG,  SEGMENT_ON);
331    break;
332
333  case 4:
334    digitalWrite(segA, SEGMENT_OFF);
335    digitalWrite(segB, SEGMENT_ON);
336    digitalWrite(segC, SEGMENT_ON);
337    digitalWrite(segD,  SEGMENT_OFF);
338    digitalWrite(segE, SEGMENT_OFF);
339    digitalWrite(segF,  SEGMENT_ON);
340    digitalWrite(segG, SEGMENT_ON);
341    break;
342
343  case  5:
344    digitalWrite(segA, SEGMENT_ON);
345    digitalWrite(segB, SEGMENT_OFF);
346    digitalWrite(segC, SEGMENT_ON);
347    digitalWrite(segD, SEGMENT_ON);
348    digitalWrite(segE,  SEGMENT_OFF);
349    digitalWrite(segF, SEGMENT_ON);
350    digitalWrite(segG, SEGMENT_ON);
351    break;
352
353  case 6:
354    digitalWrite(segA, SEGMENT_ON);
355    digitalWrite(segB,  SEGMENT_OFF);
356    digitalWrite(segC, SEGMENT_ON);
357    digitalWrite(segD, SEGMENT_ON);
358    digitalWrite(segE, SEGMENT_ON);
359    digitalWrite(segF, SEGMENT_ON);
360    digitalWrite(segG,  SEGMENT_ON);
361    break;
362
363  case 7:
364    digitalWrite(segA, SEGMENT_ON);
365    digitalWrite(segB, SEGMENT_ON);
366    digitalWrite(segC, SEGMENT_ON);
367    digitalWrite(segD,  SEGMENT_OFF);
368    digitalWrite(segE, SEGMENT_OFF);
369    digitalWrite(segF,  SEGMENT_OFF);
370    digitalWrite(segG, SEGMENT_OFF);
371    break;
372
373  case  8:
374    digitalWrite(segA, SEGMENT_ON);
375    digitalWrite(segB, SEGMENT_ON);
376    digitalWrite(segC, SEGMENT_ON);
377    digitalWrite(segD, SEGMENT_ON);
378    digitalWrite(segE,  SEGMENT_ON);
379    digitalWrite(segF, SEGMENT_ON);
380    digitalWrite(segG, SEGMENT_ON);
381    break;
382
383  case 9:
384    digitalWrite(segA, SEGMENT_ON);
385    digitalWrite(segB,  SEGMENT_ON);
386    digitalWrite(segC, SEGMENT_ON);
387    digitalWrite(segD, SEGMENT_ON);
388    digitalWrite(segE, SEGMENT_OFF);
389    digitalWrite(segF, SEGMENT_ON);
390    digitalWrite(segG, SEGMENT_ON);
391    break;
392
393  
394  case 10:
395    digitalWrite(segA,  SEGMENT_OFF);
396    digitalWrite(segB, SEGMENT_OFF);
397    digitalWrite(segC,  SEGMENT_OFF);
398    digitalWrite(segD, SEGMENT_OFF);
399    digitalWrite(segE,  SEGMENT_OFF);
400    digitalWrite(segF, SEGMENT_OFF);
401    digitalWrite(segG,  SEGMENT_OFF);
402    break;
403
404  }
405}
406

//feel free to contact
//sreeramaj53@gmail.com
//www.youtube.com/ZenoModiff

#include  <TimeLib.h>
int digit1 = 10;
int digit2 = 11; 
int digit3 = 12; 
int  digit4 = 13; 

int segA = 8;//Display pin A
int segB = 7;//splay pin b
int  segC = 6; //Display pin c
int segD = 5; //Display pin d
int segE = 4; //Display  pin e
int segF = 3; //Display pin f
int segG = 2; //Display pin g
int segDP  = 9;// Display pin dot

byte SW0 = A0;
byte SW1 = A1;
byte SW2 = A2;

void  setup() {

  pinMode(segA, OUTPUT);
  pinMode(segB, OUTPUT);
  pinMode(segC,  OUTPUT);
  pinMode(segD, OUTPUT);
  pinMode(segE, OUTPUT);
  pinMode(segF,  OUTPUT);
  pinMode(segG, OUTPUT);
  pinMode(segDP, OUTPUT);

  pinMode(digit1,  OUTPUT);
  pinMode(digit2, OUTPUT);
  pinMode(digit3, OUTPUT);
  pinMode(digit4,  OUTPUT);

 Serial.begin(9600);

  pinMode(SW0, INPUT);  
  pinMode(SW1,  INPUT);  
  pinMode(SW2, INPUT);  

  digitalWrite(SW0, HIGH); 
  digitalWrite(SW1,  HIGH);
  digitalWrite(SW2, HIGH);
}

void loop() {
   digitalWrite(segDP,  HIGH);
   int hr = hour();
  int timp = ( (hr>12)?(hr%12):hr)*100+minute();
  Serial.println(timp);
  
   for(int i = 250 ; i >0  ; i--) {
     if  (timp > 100) displayNumber01(timp);
     else displayNumber02(timp);
   }

   for(int i = 250 ; i >0  ; i--) {
     if (timp > 100) displayNumber03(timp);
     else displayNumber04(timp);
   }

  if (!(digitalRead(SW0))) set_time();
}

void  set_time()   {
  byte minutes1 = 0;
  byte hours1 = 0;
  byte minutes =  minute();
  byte hours = hour();

  while (!digitalRead(SW0)) 
  {
    minutes1=minutes;
    hours1=hours;

  while (!digitalRead(SW1)) 
    {
     minutes++;

    if (minutes > 59) minutes = 0;
     for(int  i = 20 ; i >0  ; i--) {
       int timp= hours*100+minutes;
     if (timp  > 1000) displayNumber01(timp);
     else displayNumber02(timp);
     }

   delay(150);
    }

    while (!digitalRead(SW2))
    {
     hours++;

     if (hours > 12) hours = 0;

     for(int i = 20 ; i >0  ; i--) {
     int timp= hours*100+minutes;
     if (timp > 1000) displayNumber01(timp);
     else displayNumber02(timp);
     }

     delay(150);
    }

     for(int i = 20 ; i >0  ; i--) {
     displayNumber01(hours*100+minutes);
     }
     setTime(hours,minutes,0,0,0,0);
   delay(150);

  }

}

void  displayNumber01(int toDisplay) {
#define DISPLAY_BRIGHTNESS  500

#define  DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0  ; digit--) {

  
    switch(digit) {
    case 1:
     digitalWrite(digit1,  DIGIT_ON);
     digitalWrite(segDP, LOW);
      break;
   case 2:
      digitalWrite(digit2,  DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 4:
      digitalWrite(digit4, DIGIT_ON);
      digitalWrite(segDP,  LOW);
      break;
    }
    lightNumber(toDisplay % 10);
    toDisplay  /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

  
    lightNumber(10);

    
    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2, DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4, DIGIT_OFF);
}
}

void  displayNumber02(int toDisplay) {
#define DISPLAY_BRIGHTNESS  500

#define  DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0  ; digit--) {

   
    switch(digit) {
    case 1:
     lightNumber(10);
     digitalWrite(segDP, LOW);
     break;
   case 2:
      digitalWrite(digit2,  DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 4:
      digitalWrite(digit4, DIGIT_ON);
      digitalWrite(segDP,  LOW);
      break;
    }
    lightNumber(toDisplay % 10);
    toDisplay  /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

    
    lightNumber(10);

    
    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2, DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4, DIGIT_OFF);
}
}

void  displayNumber03(int toDisplay) {
#define DISPLAY_BRIGHTNESS  500

#define  DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0  ; digit--) {

    
    switch(digit) {
    case 1:
     digitalWrite(digit1,  DIGIT_ON);
     digitalWrite(segDP, HIGH);
      break;
   case 2:
      digitalWrite(digit2, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP,  HIGH);
      break;
    case 4:
      digitalWrite(digit4, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    }
    lightNumber(toDisplay  % 10);
    toDisplay /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

    
    lightNumber(10);

   
    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2, DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4, DIGIT_OFF);
}
}

void displayNumber04(int toDisplay)  {
#define DISPLAY_BRIGHTNESS  500

#define DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0 ; digit--) {

    
    switch(digit)  {
    case 1:
     lightNumber(10);
     digitalWrite(segDP, HIGH);
     break;
   case 2:
      digitalWrite(digit2, DIGIT_ON);
      digitalWrite(segDP,  HIGH);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    case 4:
      digitalWrite(digit4,  DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    }
    lightNumber(toDisplay  % 10);
    toDisplay /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

    lightNumber(10);

    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2,  DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4,  DIGIT_OFF);
}
}

void lightNumber(int numberToDisplay) {

#define  SEGMENT_ON  LOW
#define SEGMENT_OFF HIGH

  switch (numberToDisplay){

  case 0:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE,  SEGMENT_ON);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_OFF);
    break;

  case 1:
    digitalWrite(segA, SEGMENT_OFF);
    digitalWrite(segB,  SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_OFF);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_OFF);
    break;

  case 2:
    digitalWrite(segA,  SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_OFF);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_ON);
    digitalWrite(segF,  SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case  3:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE,  SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG,  SEGMENT_ON);
    break;

  case 4:
    digitalWrite(segA, SEGMENT_OFF);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD,  SEGMENT_OFF);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF,  SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case  5:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_OFF);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE,  SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 6:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB,  SEGMENT_OFF);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_ON);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG,  SEGMENT_ON);
    break;

  case 7:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD,  SEGMENT_OFF);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF,  SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_OFF);
    break;

  case  8:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE,  SEGMENT_ON);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 9:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB,  SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  
  case 10:
    digitalWrite(segA,  SEGMENT_OFF);
    digitalWrite(segB, SEGMENT_OFF);
    digitalWrite(segC,  SEGMENT_OFF);
    digitalWrite(segD, SEGMENT_OFF);
    digitalWrite(segE,  SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG,  SEGMENT_OFF);
    break;

  }
}

Downloadable files

Schematics

7 Segment Led Clock

Schematics

Schematics

7 Segment Led Clock

Schematics

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Anonymous user

2 years ago

Hi, I like this porject. I am new to Arduino and I want to use this and turn it into a countdown timer. Can you assist me with the coding? I would really appreciate you assistance. Thanks for sharing.

Anonymous user

4 years ago

I don't see any current limiting resistor, UNO has max of 40 mA per pin. 4 LEDs per segment at max would be around 80mA per segment. Also an UNO has max total of 200mA for all pins combined. Also a digit of up to 7 segment will draw even more power, if a single digit display an 8, that is a bit over 1/2 amp! The display seems to work as drawn on schematic but the pin will eventually burn out from overdriving. If I was to design this, I would have used resistor on each LED since not all LED are perfectly equal, one faulty LED can draw more and leave other LED very dim. Then use a transistor, bipolar PNP or P-channel MOSFET on each of the digit common to 5v source so Arduino would only need a few mA per digit to drive.

noneedforit

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