#MA PIC ADC Interfacing

//Main.c

// INTEGER

#include <P18f4520.h>

#include<stdio.h>

#include<stdlib.h>

#include "lcd.h"

#pragma config OSC=HS

#pragma config PWRT=OFF

#pragma config WDT=OFF

#pragma config DEBUG=OFF, LVP=OFF

unsigned char text1[]={" ADC Expt. "};

unsigned char text2[]={"ADC IN="};

unsigned char L,H,RD,reference[20];

unsigned long adcout;

void main()

{

TRISD = 0x00;

TRISB=0x00;

TRISAbits.TRISA0=1; //ADC channel 0

CMCON=0x07;

ADCON1 = 0X0C; //AN0 as analog iput

ADCON2=0x86; //Right justified,Fosc/64

lcdinit();

lcddisplay(1,text1);

lcddisplay(2,text2);

while(1)

{

ADCON0 = 0X01; //Channel 0 selected

ADCON0bits.GO = 1; //start  convergen

while(ADCON0bits.DONE ==1); //wait for convergen end

L=ADRESL;

H=ADRESH;

L>>=2;

L &=0x3F;

H<<=6;

H &=0xC0;

adcout=L |H;

RD=adcout*5/254;

sprintf(reference,"%d Volt",RD);

lcddisplayvalue(1,reference);

}

}

//---------------------------------------------------------------------------------------

//lcd.h

void delay(unsigned int value);

void lcdcmd(unsigned char value);

void lcddata(unsigned char value);

void lcdinit(void);

void lcddisplayvalue(int row,unsigned char *str);

void lcddisplay(int row, unsigned char *str);

#define ldata PORTD

#define rs PORTBbits.RB3

#define rw PORTBbits.RB4

#define en PORTBbits.RB5

void lcddisplayvalue(int row,unsigned char *str)

{

int k;

if (row==1)

lcdcmd(0xC7);

else lcdcmd(0xC9);

for(k=0;k<16;k++)

{

if(str[k] !=0)

lcddata(str[k]);

else  break;

}

while((k<16)){

lcddata('     ');

k++;

}

}

void lcddisplay(int row,unsigned char *str)

{

int k;

if (row==1)

lcdcmd(0x80);

else lcdcmd(0xC0);

for(k=0;k<16;k++)

{

if(str[k] !=0)

lcddata(str[k]);

else  break;

}

while((k<16)){

lcddata('     ');

k++;

}

}

void delay(unsigned int value)

{

int i,j;

for(i=0;i<=value;i++)

for(j=0;j<=5;j++);

}

 void lcdcmd (unsigned char value)

{

ldata=value;

rs=0;

rw=0;

en=1;

delay(1);

en=0;

}

 void lcddata (unsigned char value)

{

ldata=value;

rs=1;

rw=0;

en=1;

delay(1);

en=0;

}

void lcdinit(void)

{

lcdcmd(0x38);

// delay(1);

lcdcmd(0x0E);

// delay(1);

lcdcmd(0x01);

// delay(1);

lcdcmd(0x06);

// delay(1);

}