Problems about pic thermometer

If you are using the internal A2D already, what are you using the external A2D for? Double checking the PIC A2D?

Thank you for answering me. Firstly, the address of datasheet of ADC converter is

I never learned c language before, I feel difcult to work it out. What I want to know now is how to display the voltage value of the temp sensor on the LCD. After that, I know how to use the eqn. for temperature and voltage to show the temperature on the LCD.

The following was the code I have figure out. I could not going on and do not know whether they are right or wrong.

#include "p18f45k20.h" #include "delays.h" #include "lcd.h"

#pragma udata // declare statically allocated uinitialized variables

#pragma code // declare executable instructions

void main (void) { // set internal oscillator to 4MHz OSCCON =3D 0x50; // IRCFx =3D

lcd_init(); // initialise display = // write first screen lcd_goto(0x00); // goto 1st line position 3

lcd_puts ("PIC Thermometer"); // write string to display lcd_goto(0x44); // second line position 4 lcd_puts ("Runnin..."); // write second line

Delay10KTCYx(255); // delay approx 2.5 Seconds

lcd_clear(); // clear lcd lcd_goto(0); // 1st line position 1 lcd_puts("Temperature is:"); lcd_goto(0x40); lcd_puts ("lalalala.."); = // I just use lalalala to inst. temperature what I want.

Delay10KTCYx(255); // delay approx 2.5 Seconds while(1);

void Timer0_Init(void) { INTCONbits.TMR0IF =3D 0; // clear roll-over interrupt flag T0CON =3D 0b00000001; // prescale 1:4 - about 1 second maximum delay. TMR0H =3D 0; // clear timer - always write upper byte first TMR0L =3D 0; T0CONbits.TMR0ON =3D 1; // start timer

void ADC_Init(void) { ANSEL =3D 0; //turn off all other analog inputs ANSELH =3D 0; ANSELbits.ANS6 =3D 1; // turn on RE1 analog ADCON0 =3D 0b00011001;

unsigned char ADC_Convert(void) { // start an ADC conversion and return the 8 most-significant bits of the result ADCON0bits.GO_DONE =3D 1; // start conversion while (ADCON0bits.GO_DONE =3D=3D 1); // wait for it to complete return ADRESH; // return high byte of result

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So, how do you hook up the 14504BCP?