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increment

 
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nina



Joined: 20 Apr 2007
Posts: 111

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increment
PostPosted: Sun May 16, 2010 9:02 pm     Reply with quote
What I need is when I press button2, I want to increment after 0.5 seconds the numbers shown at two 7-segment displays.
The code that I am using is below. When I press button2 it is incrementing very fast both digits.
Code:

if (input(button2) == 0)
  {
   increment = increment +1;
   vdezena = increment/10;
   vunit = increment - (vdezena*10);
   output_b(dezena[vdezena]);
   delay_ms(5);
   output_b(unit[vunit]);
   delay_ms(5);
  }

thank you very much

nina
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun May 16, 2010 9:13 pm     Reply with quote
Quote:
I want to increment after 0.5 seconds the numbers

The simple answer is to put a 500 ms delay statement at the start of
the if() block.

Ideally, you wouldn't check the switch with an if() statement, instead
you would use a debounce routine. See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=42285&highlight=debounce+button
nina



Joined: 20 Apr 2007
Posts: 111

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increment
PostPosted: Mon May 17, 2010 9:52 am     Reply with quote
I tried put a delay after if but the 7 segment display responsible to show output_b(dezena[vdezena]) start flashing.

What can I do to solve this problem?

Thank you

Nina
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 17, 2010 5:50 pm     Reply with quote
Use the pushbutton code shown in this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=19874&start=1


Connect a push-button switch and a pull-up resistor to a pin on your PIC:
Code:

           +5v
            |
            <
            > 4.7K       
            <         ___ Push button switch 
To          |        _|_|_
PIC -----------------o   o------
pin                            |             
                              --- GND
                               -   


Then change your main program so it's similar to this:
Code:

void main()
{
int8 increment = 0;

while(1)
  {
   wait_for_keypress();

   increment++;

   // Put the 7-segment code here.
   
  }

}
nina



Joined: 20 Apr 2007
Posts: 111

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increment
PostPosted: Wed May 19, 2010 5:00 pm     Reply with quote
Thank you for all responses...the way I solved the problem was:
Code:

while (input(button1) == 0)
{
output_b(dezena[vdezena]);
delay_ms(5);
output_b(unidade[vunidade]);
delay_ms(5);

if (input(button2) == 0)
  {
   a++;
   if (a == 50)
     {
      incrementa = incrementa +1;
      vdezena = incrementa/10;
      vunidade = incrementa - (vdezena*10);
      output_b(dezena[vdezena]);
      delay_ms(5);
      output_b(unidade[vunidade]);
      delay_ms(5);
      a = 0;
     }
  }
}

It is working but I would like to know if there is another way to do this...

tks again

nina
nina



Joined: 20 Apr 2007
Posts: 111

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increment
PostPosted: Sat May 22, 2010 1:55 pm     Reply with quote
What is the way and/or hardware that I can use to "save" some pins at PIC when using 7 segments display?
Suppose I need use 6 display 7 segments. How to "save" pins at PIC?

Thank you

Nina
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat May 22, 2010 2:04 pm     Reply with quote
I think you are asking how to multiplex the pins on one 7-segment display.
Normally, the multiplexing is done with several displays. 7 pins are used
on the PIC to display the segments. Then other pins on the PIC are
used to enable each display (each digit).
Scroll down to Figure 6 on this webpage. It shows how to connect the
wires.
http://www.melabs.com/resources/articles/ledart.htm
Is this what you really want to do ?
nina



Joined: 20 Apr 2007
Posts: 111

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multiplex
PostPosted: Sat May 22, 2010 3:41 pm     Reply with quote
That is what I am looking for...

Where can I find some examples (CCS) about multiplexing 7 segment display.

Thank you for this informations
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