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problem with using ADC channel 1-8

 
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pandu.ranganadh



Joined: 28 Apr 2008
Posts: 12
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problem with using ADC channel 1-8
PostPosted: Mon May 12, 2008 12:46 am     Reply with quote

Hi

I am using pic16f877 and microchip old version board.
My problem is i am unable to get ADC output through channels 1-8.

#include <16F877.H>
#device adc=10
//#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=16000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

#include "flex_lcd.c"

//============================
void main()
{
int16 adc_value;
float volts,a=10.25;

lcd_init();


setup_adc_ports(RA0_ANALOG);

//setup_adc_ports(ALL_ANALOG);

setup_adc(ADC_CLOCK_INTERNAL);

set_adc_channel(5);
//set_adc_channel(1);

delay_us(20);


while(1)
{
adc_value = read_adc();



volts = (float)(adc_value * 5)/1023.0; // This is the fixed formula

//lcd_putc("\f Output \n");

printf(lcd_putc,"\f %3.4f Volts\n",volts);


delay_ms(500);

}


}


My ccs c compiler version is 4.
Please help me to read ADC channels 1-8.

Bye
Thanking you,
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 12, 2008 1:03 am     Reply with quote

Please don't start another new topic on the same problem.
You already have four previous topics on it. Just add a new
question to one of the existing topics. Here are all your
previous threads -- all of them on the same topic !

Problem with Multiple ADC channels
http://www.ccsinfo.com/forum/viewtopic.php?t=34748

Problem with Multiple ADC channels
http://www.ccsinfo.com/forum/viewtopic.php?t=34718

Problem with Multiple ADC channels
http://www.ccsinfo.com/forum/viewtopic.php?t=34690

Problem with multiple ADC channels
http://www.ccsinfo.com/forum/viewtopic.php?t=34641

Quote:
My problem is i am unable to get ADC output through channels 1-8.

You have been told in previous answers that your version of the Picdem2
Plus board doesn't support A/D input on all those channels. Some of
the channels are hard-wired for use as normal i/o pins to drive the LCD
or are connected to a trimpot.

Quote:

Please help me to read ADC channels 1-8.

You can't ever use Channels 0, 1, 2, or 3 for general purpose A/D.
There is no channel 8 on the board. You can only use channels 4-7.

Please don't keep asking this question over and over again.
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