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digital clock

 
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  #1
Mar 13th, 2007
i face a problem, im doing a programing that program into the PIC16F684. im doing a digital clock, now i only able to show the second value that display 1 to 60, i dont know how to do the minute value. im using while loop.
c Syntax (Toggle Plain Text) 
  1. while(1 == 1)              
  2.     {
  3.         if (0 == DisplayLED)
  4.         {
  5.             RA5 = LEDDigit[DisplayValue %10] >> 6; 
  6.             PORTC = LEDDigit[DisplayValue %10] & 0x03F;
  7.         }
  8.         else
  9.         {
  10.             RA5 = LEDDigit[(DisplayValue /10) & 0x0F] >> 6; 
  11.             PORTC = LEDDigit[(DisplayValue /10) & 0x0F] & 0x03F;
  12.         }  
  13.         TRISA = TRISA ^ 0b011111;  
  14.         PORTA = PORTA & 0b111100;  
  15.         DisplayLED = DisplayLED ^ 1;  //  Other Digit Next
  16.  
  17.         NOP();                  
  18.         for (i = 0; i < 660; i++); 
  19.         NOP();                 
  20.  
  21.         j = j + 1;             
  22.         if (100 == j)           
  23.         {
  24.             DisplayValue++;    
  25.             j = 0;              
  26.         }  
  27.     }
how to add the minutes value? as well hour and day...thank... S.O.S.....
Last edited by WaltP; Mar 13th, 2007 at 1:51 pm. Reason: Please use CODE tags
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Re: digital clock

 
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  #2
Mar 14th, 2007
Well first I'd probably rename DisplayValue to be something more meaningful like DisplaySeconds.

Then I might add
C++ Syntax (Toggle Plain Text) 
  1. if ( DisplaySeconds == 60 ) {
  2.     DisplaySeconds = 0;
  3.     DisplayMinutes++;
  4. }

I gather from your code you have a pair of 7-segment displays for displaying seconds.
Do you have another pair for the minutes as well.
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digital clock

 
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  #3
Mar 14th, 2007
yeah, i got the right circuit diagram just dont know how to write the program to apply the minutes. i had connected 4 7segments to the 4 transistors and the 4 transistors connected to RA0, RA1, RA2 and RA3 on the PIC16F684.
should i add another if...else statement in the while loop? where should i add into if yes. thank
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Re: digital clock

 
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  #4
Mar 14th, 2007
Here's an algorhithm in C/C++. You can convert it into whatever you're using.
C++ Syntax (Toggle Plain Text) 
  1. int sec = 0;
  2. int min = 0;
  3. int hour = 0;
  4. while(1)
  5. {
  6.    sleep(1000); //delay in milliseconds
  7.    ++sec;
  8.     if(sec == 60)
  9.     {
  10.       sec = 0;
  11.       ++min;
  12.        if(min == 60)
  13.        {
  14.            min = 0;
  15.           ++hour;
  16.           if(hour == 24)
  17.           {
  18.              hour = 0;
  19.           }
  20.        }
  21.     }
  22.    display(hour, min, sec);
  23. }
Last edited by Lerner; Mar 14th, 2007 at 3:55 pm.
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Re: digital clock

 
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  #5
Mar 14th, 2007
Well what you do in software depends entirely on what you've done with the hardware.

Say for example, you use 4 bits to drive one 7-segment display, then use the other 4 bits to choose one of 4 displays

Say
bit 7 selects the 10's for M
bit 6 selects the units for M
bit 5 selects the 10's for S
bit 4 selects the units for S
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Re: digital clock

 
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  #6
Jul 30th, 2009
plz i need full program of digital clock in c++

giv me peply
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Re: digital clock

 
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  #7
Jul 30th, 2009
digital clock program code is needed..try to solve my probs.
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Re: digital clock

 
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  #8
Jul 30th, 2009
when your display value reaches 60, you add 1 to minutes, and
keep doing this until your minutes adds to 1 hour;

Try this circular loop :
C++ Syntax (Toggle Plain Text) 
  1. displayValue = ++displayValue % 60;
  2. min = displayValue % 60 + displayValue/60
  3. hour = min % 60  + min/60
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