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ADC using ... PIC18f2331

 
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sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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ADC using ... PIC18f2331
PostPosted: Tue Dec 20, 2005 1:18 am     Reply with quote
May I know how can I write a analog to digital conveter using PIC18F2331??


PortA 0 will be input for analog in....


and PortB 0 will be digital output for for the digitalised signal from PortA 0.



Thanks in advance...

Smile
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Dec 20, 2005 12:29 pm     Reply with quote
Quote:
May I knw how can I write a analog to digital conveter using PIC18F2331??
PortA 0 will be input for anlog in....
PortB 0 will be digital output for for the digitalised signal from port A 0.

Study these functions in the CCS manual and in the example files:

setup_adc_ports()
setup_adc()
read_adc()
set_adc_channel()
output_b()

Download the CCS manual here:
http://www.ccsinfo.com/ccscmanual.zip

The example files are in this folder:
c:\Program Files\PICC\Examples
sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Sat Jan 14, 2006 1:30 am     Reply with quote
Guys,,,I can make it works...thanks for help...

Code:

#include<16f877a.h>
#fuses HS,NOLVP,NOWDT,PUT
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)

void main() {
int i, value, min, max;

printf("Sampling:");

setup_adc_ports( RA0_ANALOG );
setup_adc( ADC_CLOCK_INTERNAL );
set_adc_channel( 0 );

do { //Takes 30 samples from pin A0
min = 255; //and displays the min and max
max = 0; //values for that 100ms period
for(i = 0; i <= 30; ++i) {
delay_ms(100);
value = read_adc();
if(value < min)
min = value;
if(value > max)
max = value;
}
printf("\n\rMin:%x MAX: %x", min, max);
} while (TRUE);
}

The above ADC sample show that it reads "Input" from Port A0, calculates max, min etc and display via RS232....

Smile
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