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Analog input

 
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switchblademaster
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Analog input
PostPosted: Sat Nov 07, 2009 11:17 am     Reply with quote
This is my code:
Code:

set_adc_channel( 0 );
delay_us(20);
RIGHT_2 = read_adc();
R2V = (3 * RIGHT_2);
printf("%lu voltage6 \n",R2V);
delay_ms(300);

I want to multiply my analog input by 3, however this does not happen. The analog value stays as what the ADC reads. Anybody can help me?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Nov 07, 2009 11:58 am     Reply with quote
Post a complete, compilable ADC test program, showing the variable
declarations. Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=32168&start=1
switchblademaster
Guest
PostPosted: Sat Nov 07, 2009 12:04 pm     Reply with quote
Code:
#include <18f4520.h>
#device ICD=TRUE
#fuses HS,NOLVP,NOWDT
#use delay (clock=20000000)
#use rs232 (DEBUGGER)

  int CENTER_L;
  int CENTER_R;
  int LEFT_1;
  int LEFT_2;
  int RIGHT_1;
  int RIGHT_2;
  int set_point=60;
  float sp = 2.5;
  int Kp = 7;
  float Kd = 0.8;
 
  int1 i;
  int MAX_PWM = 1023;
  int MIN_PWM = 50;
  int MAX = 1023;
  int MIN = 60;
  float average, error, total_error;
  float Perr,Derr, P, D;
  float Previous_error = 0;
  long L2V, L1V, R2V, R1V, LC, RC;
  float PWM,PDpwm;

void main()
{
long reading;
setup_adc_ports(AN0_to_AN1);
setup_adc( ADC_CLOCK_INTERNAL );


while(TRUE)
      {
   
        set_adc_channel( 0 );
         delay_us(20);
         RIGHT_2 = read_adc();
         R2V = (3 * RIGHT_2);
         printf("%lu voltage6 \n",R2V);
         delay_ms(300);
      }
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Nov 07, 2009 12:12 pm     Reply with quote
In CCS, an 'int' is an 8-bit unsigned integer. This applies to PCB, PCM
and PCH, but not to the PCD compiler. You can use 'int16' to declare
a 16-bit unsigned integer. To fix your problem, you need to change
some of your variable declarations.
switchblademaster
Guest
PostPosted: Sat Nov 07, 2009 12:36 pm     Reply with quote
WELL THAT MAKES SENSE LOL!!!!!!!

I now say I had the reading from the ADC as an int........my carelessness

Thanks again...........you r very helpful
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