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ADC WITH 16F877

 
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YAMAKACHI
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ADC WITH 16F877
PostPosted: Thu Apr 16, 2009 7:05 am     Reply with quote
hello my friends
I want to send a positive SIGNAL alternative (0-5v) to the PIC 16F877 by PORT A (RA0) and send it to pc via rs232 to see what signal (interface to the signal with delphi or vb ....)
I wrote a program :
Code:
 #include "C:\Documents and Settings\youcef\Mes documents\fin.h"
int  adcValue;
float result;
void main()
{
   setup_adc_ports(AN0);
   setup_adc(ADC_CLOCK_DIV_8);
   set_adc_channel(0);
   delay_ms(20);
   while(true){
     adcValue=read_adc();
         result = (float)(adcValue)*5/255;
         printf("%f",result);
         delay_us(40);
        }
   
 

   // TODO: USER CODE!!

}

is what this program is sufficient to make this work and thank you
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Apr 16, 2009 1:29 pm     Reply with quote
Post the contents of this file:
Quote:
"C:\Documents and Settings\youcef\Mes documents\fin.h"

Then we can check the parameters used in your program.

Also post your compiler version.
sapy44



Joined: 01 Feb 2004
Posts: 19
Location: Cedar Rapids, IA

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int bit resolution
PostPosted: Thu Apr 16, 2009 3:17 pm     Reply with quote
With the 16F877 the ADC value is 10 bits. A simple int declaration will create an 8-bit variable. Try using int16 instead. You will all need to multiply by 1023 instead of 255.
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