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18F2525 ADC problem

 
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jun 07, 2010 11:21 am     Reply with quote
Try a more simple program that will display ADC values from 0 to 1023
based on the input voltage. Also, make sure you have a ground
connection between the device that supplies the ADC input voltage and
the PIC board's ground. You can't just have the input signal wire to
pin A0. There must also be a ground wire between the two devices,
connected to the ground on each device (or board).
Code:

#include <18F2525.h>
#device adc=10
#fuses INTRC_IO, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//============================
void main()
{
int16 adc_value;
 
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_DIV_4);
set_adc_channel(0);
delay_us(20);

while(1)
  {
   adc_value = read_adc();
   printf("%lu", adc_value);
   delay_ms(500);
  }
}
peterl



Joined: 09 Oct 2009
Posts: 13
Location: SF,BG

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re: PIC18F2525 ADC
PostPosted: Tue Jun 08, 2010 1:12 am     Reply with quote
The problem was here:
set_adc_channel(AN0); is not correct, correct is set_adc_channel(0);
10X Very Happy
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