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problem with ADC code on 16F877A

 
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xtina



Joined: 14 May 2009
Posts: 7

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problem with ADC code on 16F877A
PostPosted: Mon May 25, 2009 1:20 pm     Reply with quote
Code:
#include <16f877a.h>
#device ADC = 10
#fuses xt, noprotect, nowdt, nolvp
#use delay (clock=4000000)

#byte porta=5
#byte portd=8

void main()
{
   set_tris_a(1);
   set_tris_d(0);
   setup_adc_ports(ALL_ANALOG);
   setup_adc(ADC_CLOCK_INTERNAL);
   set_adc_channel(0);
   
   while(true)
   {
      if (read_adc() > 409.6)
      {
      portd=0x0A;
      }
     
      if (read_adc() < 409.6)
      {
      portd=0x00;
      }
   }
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 25, 2009 1:44 pm     Reply with quote
Quote:
if (read_adc() > 409.6)

The read_adc() function doesn't return a floating point value. It returns
an unsigned integer value from 0 to 1023 (for 10-bit ADC mode).
xtina



Joined: 14 May 2009
Posts: 7

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PostPosted: Mon May 25, 2009 1:50 pm     Reply with quote
plz what is the solution
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 25, 2009 1:57 pm     Reply with quote
Simplify it. Do it like this:
Code:
while(true)
   {
    if(read_adc() > 410)
      {
       portd=0x0A;
      }
    else
      {
       portd=0x00;
      }
   }
xtina



Joined: 14 May 2009
Posts: 7

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PostPosted: Mon May 25, 2009 2:31 pm     Reply with quote
no it didn't work man
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 25, 2009 2:38 pm     Reply with quote
Try another test program, to see if your ADC setup is working at all:
http://www.ccsinfo.com/forum/viewtopic.php?t=32168&start=1
xtina



Joined: 14 May 2009
Posts: 7

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PostPosted: Mon May 25, 2009 3:53 pm     Reply with quote
also it didn't work Sad
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 25, 2009 4:19 pm     Reply with quote
Have you ever made this PIC do anything (with the CCS compiler) ?
For example, blinking an LED.

Did you build the board yourself or did you buy it ? If you bought the
board, post the manufacturer and part number of the board and a link to
the website for it.
xtina



Joined: 14 May 2009
Posts: 7

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PostPosted: Mon May 25, 2009 11:27 pm     Reply with quote
ya i try it on my line follower robot and works perfectly, but i wanna add my ultrasonic sensor to avoid obstacles.(I try it on another compiler and it works plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz help me)
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