[PIC] lm35 intercacing to pic18f4550

[vgavale]

the code is running but it is not displaying temperature value.


following is code

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Code C - [expand]
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/********************************************************************************/
/*This program demonstrates the interfacing of LCD to PIC18F4550 microcontroller*/
/********************************************************************************/
 
/*
LCD DATA port----PORT D
signal port------PORT E
    rs-------RE0
    rw-------RE1
    en-------RE2
*/
#include <p18f4550.h>
#include<stdlib.h>
 
 
//LCD data pins connected to PORTD and control pins connected to PORTE
#define LCD_DATA    PORTD               //LCD data port
#define ctrl        PORTE               //LCD signal port
#define en          PORTEbits.RE2      // enable signal
#define rw          PORTEbits.RE1      // read/write signal
#define rs          PORTEbits.RE0     // register select signal
#define BUSY        PORTDbits.RD7
#define Channel0 0b00000000
#define Channel1 0b00000100
 
void ADC_Init();
void Select_Channel(unsigned char Channel);
void Get_ADC_Result(void);
void Start_Conversion(void);
 
void myMsDelay (unsigned int time);
 
//LCD function definitions
void LCD_Busy(void);
void LCD_cmd(unsigned char cmd);
void init_LCD(void);
void LCD_write(unsigned char data);
void LCD_write_string( char *str);
//void LCD_itoa(unsigned float t,arr[5])
/*The following lines of code perform interrupt vector relocation to work with the USB bootloader. These must be
used with every application program to run as a USB application.*/
extern void _startup (void);
#pragma code _RESET_INTERRUPT_VECTOR = 0x1000
 
void _reset (void)
{
        _asm goto _startup _endasm
}
 
#pragma code
#pragma code _HIGH_INTERRUPT_VECTOR = 0x1008
void high_ISR (void)
{
}
 
#pragma code
#pragma code _LOW_INTERRUPT_VECTOR = 0x1018
void low_ISR (void)
{
}
#pragma code
//Function to generate delay
void myMsDelay (unsigned int time)
{
        unsigned int i, j;
        for (i = 0; i < time; i++)
                for (j = 0; j < 710; j++);/*Calibrated for a 1 ms delay in MPLAB*/
}
 
 
// Function to initialise the LCD
void init_LCD(void)
{
    LCD_cmd(0x38);      // initialization of 16X2 LCD in 8bit mode
    myMsDelay(15);
 
    LCD_cmd(0x01);      // clear LCD
    myMsDelay(15);
 
    LCD_cmd(0x0C);      // cursor off
    myMsDelay(15);
 
    LCD_cmd(0x80);      // ---8 go to first line and --0 is for 0th position
    myMsDelay(15);
  
 
          
}
//Function to pass command to the LCD
void LCD_cmd(unsigned char cmd)
{
    LCD_DATA = cmd;
    rs = 0;
    rw = 0;
    en = 1;
    myMsDelay(15);
    en = 0;
    myMsDelay(15);
    return;
}
 
//Function to write data to the LCD
void LCD_write(unsigned char data)
{
    LCD_DATA = data;
    rs = 1;
    rw = 0;
    en = 1;
    myMsDelay(15);
    en = 0;
    myMsDelay(15);
    return ;
}
//Function to split the string into individual characters and call the LCD_write function
void LCD_write_string( char *str)   //store address value of the string in pointer *str
{
    int i = 0;
    while (str[i] != 0)
    {
        LCD_write(str[i]);      // sending data on LCD byte by byte
        myMsDelay(15);
                i++;
    }
    return;
}
 
void ADC_Init()
{
 ADCON0=0b00000000; //A/D Module is OFF no channel selected
 ADCON1=0b00001110; // Reference as VDD & VSS, AN0 set as analog pins
 ADCON2=0b10001110; // Result is right Justified
                    //Acquisition Time 2TAD
                    //ADC Clk FOSC/64
 ADCON0bits.ADON=1; //Turn ON ADC module
}
 
void Select_Channel(unsigned char Channel)
{
 ADCON0=ADCON0 & 0b11000001;    
 ADCON0=ADCON0 | Channel;   //selecting channel no 0
}
 
void Start_Conversion()
{
 ADCON0bits.GO=1;
}
 
 
//If you do not wish to use adc conversion interrupt you can use this
//to do conversion manually. It assumes conversion format is right adjusted
void Get_ADC_Result()
{
unsigned float t;
char arr[5];
unsigned char val,pot0[6]; 
 unsigned int ADC_Result=0;
 while(ADCON0bits.GO);
 ADC_Result=ADRESL;
 ADC_Result|=((unsigned int)ADRESH) << 8;
 t=(ADRESH * 0.48876); //Convert to Degree Celcius - ADRES (16bit) is the output of ADC
 
}
 
 void main(void)
{
 
    unsigned float t;
unsigned int adc_val;
unsigned  char arr[5];
     char var1[] = "Temperature:";
     ADCON1 = 0x0F;        //Configuring the PORTE pins as digital I/O 
     TRISD = 0x00;         //Configuring PORTD as output
     TRISE = 0x00;         //Configuring PORTE as output    
    init_LCD();           // initialization of LCD
     myMsDelay(5);       // delay of 5 mili seconds
    LCD_write_string(var1);
Get_ADC_Result();
 LCD_cmd(0xC0);
 LCD_write_string('itoa(t,arr[5])');
LCD_write(0xDF);
* * * * LCD_write('C');
 
while(1)
{
Select_Channel(Channel0);  
Start_Conversion();
 Get_ADC_Result();
}     
   //LCD_cmd(0xC0);
 //LCD_write_string(var1);
 // Move cursor to line 2 position 1
 
** * //*LCD_write('t'); * * * * *// Display the temperature*
* * * *// LCD_write(0xDF);
* * * //* LCD_write('C');
 
 
 
}

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[paulfjujo]

hello

with 18F you must use LAT instead of PORT to do output commande
use LATbits.LATREx .. etc ..