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question on ex_rmsdb.c

 
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atabac_2000



Joined: 21 Apr 2004
Posts: 10

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question on ex_rmsdb.c
PostPosted: Wed Aug 08, 2007 6:20 am     Reply with quote
Hi,

Had anyone toyed around ex_rmsdb.c? There's a line of code that tells:

Code:
 

void main() {
   const long NUM_DATA_POINTS = 3000;
   long i;
   int value;
   float voltage;

   printf("Sampling:\r\n");

   setup_port_a( ALL_ANALOG );
   setup_adc( ADC_CLOCK_INTERNAL );
   set_adc_channel( 1 );

   while(TRUE)
   {
      voltage = 0;
      for(i=0; i<NUM_DATA_POINTS; ++i)
      {
         value = Read_ADC();
         voltage += (float)value*(float)value;
      }
      voltage /=2601.0;
      voltage = sqrt(voltage/(NUM_DATA_POINTS));
      printf("\r\nInput =  %f V     %f dB\r\n", voltage, 20*log10(voltage));
   }
}




I wonder what's the 2601.0 for?
Ttelmah
Guest
PostPosted: Wed Aug 08, 2007 7:12 am     Reply with quote
1/((5/255)^2)

It is in the comments in the file.

Best Wishes
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