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capacitance meter

 
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cool121



Joined: 16 Mar 2011
Posts: 10
Location: US

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capacitance meter
PostPosted: Wed May 18, 2011 5:50 am     Reply with quote

http://www.pic_examples.byethost3.com/capacitance_meter.html

I'm going to build above meter using pic18f4550. can somebody give me the picc code for this.
temtronic



Joined: 01 Jul 2010
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PostPosted: Wed May 18, 2011 6:06 am     Reply with quote

Well...you've got 3 choices

1) convert the C code from the webpage to CCS C. Easy to do, maybe 1-2 hours

2) create or locate a 'sourcecode' translation program.Not so easy, but doable in 1 -2 days

3)use 'google' to locate CCS C code.Simple these day, maybe 10-20 minutes....
SherpaDoug



Joined: 07 Sep 2003
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PostPosted: Wed May 18, 2011 6:16 pm     Reply with quote

If you go for option 1 you have a fair chance of learning HOW the code works. That means you can modify it to do exactly what YOU want instead of what to original coder wanted.
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rnielsen



Joined: 23 Sep 2003
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PostPosted: Fri May 20, 2011 10:36 am     Reply with quote

I really hate how somebody says, "I want to do this project, now give me the code so I don't have to think". TRY to learn HOW to do something, that way you don't have to keep asking for somebody else to do it for you.

Ronald
Pie are square, right?
cool121



Joined: 16 Mar 2011
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PostPosted: Fri May 20, 2011 11:13 am     Reply with quote

I did it. but it does not give correct value.

Code:

#include <16F877A.H>
#device adc=8
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=16000000)

#include <lcd.c>
#Byte PR2= 0x92
unsigned int32 cnt=0;

#INT_TIMER2
 void timer2_isr(){
 CLEAR_INTERRUPT(INT_TIMER2);
 cnt++;
 set_timer2(0);
 PR2=66;
 }

void main()
{
lcd_init();
 setup_adc_ports(ALL_ANALOG);
setup_comparator(A0_A3_A1_A2);
setup_timer_2(T2_DISABLED,255,1);
C1OUT=1;
while(1){
 
if(!input(PIN_B0)){
   cnt=0;
   set_timer2(0);
   setup_timer_2( T2_DIV_BY_4,40, 1);
   OUTPUT_HIGH(PIN_B4);
 
   ENABLE_INTERRUPTS(INT_TIMER2);
   ENABLE_INTERRUPTS(GLOBAL);
   
   while(!C1OUT){}
      OUTPUT_LOW(PIN_B4);
      disable_interrupts(GLOBAL);
      setup_timer_2(T2_DISABLED,255,1);

      float VAL=cnt*10;
      lcd_putc("\f");
      printf(lcd_putc,"%f",VAL);
     delay_ms(200);
}
 
}
 
     
}
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
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PostPosted: Fri May 20, 2011 2:27 pm     Reply with quote

Since few of us have your PIC and none of us have your hardware...can you give us a hint? What sort of value does it give you? Does it print anything? Does it print a number? Does it print a stable number? Is the error small or huge?

For troubleshooting this sort of circuit it really helps to have a scope. Put the scope on the capacitor you are measuring and see if the waveform is what you expect. Of course you need to understand how the system should work to know what waveform to expect.
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bkamen



Joined: 07 Jan 2004
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PostPosted: Fri May 20, 2011 7:40 pm     Reply with quote

rnielsen wrote:
I really hate how somebody says, "I want to do this project, now give me the code so I don't have to think". TRY to learn HOW to do something, that way you don't have to keep asking for somebody else to do it for you.



Most of the time I ignore such "demands" for help. Sometimes I tell the person they'd probably attract a lot more help if they asked for it rather than insisted on the straight path to insistence/demanding.

-Ben

p.s. and yes, I realize sometimes there's a language barrier too.
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