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Error in configuring ADC for PIC18F66J50

 
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akshaymathur39



Joined: 05 Aug 2008
Posts: 11

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Error in configuring ADC for PIC18F66J50
PostPosted: Mon Apr 26, 2010 7:31 pm     Reply with quote
Dear Friends,

I am having some problem in configuring ADC for PIC18F66j50. Here is the code snippet:

Code:
void main()
{   
PLLEN = 1;
setup_adc_ports(sAN0);
setup_adc(ADC_CLOCK_INTERNAL );

//port_g_pullups (TRUE);
port_e_pullups (TRUE);
//port_g_pullups (TRUE);

//!while(1){
//!output_high(PIN_A0); delay_ms(1000);
//!output_low(PIN_A0); delay_ms(1000);
//!
//!}


set_tris_c(0);
//set_tris_a(1);

glcd_init(ON);                               // Must initialize the LCD
glcd_text57(1,1,init,1,ON);
delay_ms(1000);
set_adc_channel(0);
delay_ms(100);

while(1){
   i = read_adc();
   sprintf(rTemp,"%Ld   ",i);
   rTemp[5]="\0";
   
   glcd_text57(30,30,rTemp,1,ON);
   delay_ms(100);
}
}


This code always shows ADC value as 1023. Only when I short circuit ADC input to ground, it shows 20.

Can anybody please suggest something. Other pins on portA are driving a multiplxer.
akshaymathur39



Joined: 05 Aug 2008
Posts: 11

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PostPosted: Mon Apr 26, 2010 7:52 pm     Reply with quote
Dear Friends, I tried input through potentiometer and it works perfectly fine. I could see swiping through complete range (0-1023). But when I connect it to LM35, it shows 1023 always. Can anybody please suggest the possible cause and solution.

I tested LM35, and individually it works fine.
akshaymathur39



Joined: 05 Aug 2008
Posts: 11

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PostPosted: Tue Apr 27, 2010 9:51 am     Reply with quote
Awaiting replies friends...
Please help
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Apr 27, 2010 11:38 am     Reply with quote
You didn't post a full program. You have tons of commented out code.
You don't show the setup functions for the adc.

There are many posts on the LM35 in the forum archives.
Put LM35 into the search page, here:
http://www.ccsinfo.com/forum/search.php

I got over 40 hits. Here are two of them. I suggest you do the search
and read all the articles:
http://www.ccsinfo.com/forum/viewtopic.php?t=39363
http://www.ccsinfo.com/forum/viewtopic.php?t=31260
kongfu1



Joined: 26 Apr 2010
Posts: 56

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Which version of compiler you are using?
PostPosted: Tue Apr 27, 2010 11:38 am     Reply with quote
Which version of compiler you are using?

akshaymathur39 wrote:
Awaiting replies friends...
Please help
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