interfacing lm35 with pic18f4550

[Mohamad Atip]

help me please....
i want make project automatic shoe dryer...but i dont know how to interfacing with pic18f4550.



this is my program:

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Code C - [expand]
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#include <p18f4550.h>
#include "delays.h"
 
 
//  Configuration bits
//=============================================================================
#pragma config PLLDIV   = 5         // (20 MHz crystal), divide with 5 to get 4MHz and go through 96MHz PLL
#pragma config CPUDIV   = OSC1_PLL2 //CPU use 96MHZ/ 2 = 48MHz
#pragma config USBDIV   = 2         //USB clock at 96MHz / 2 = 48 MHz
#pragma config FOSC     = HSPLL_HS  //High Speed Oscillator, PLL enabled
#pragma config FCMEN    = OFF
#pragma config IESO     = OFF
#pragma config PWRT     = OFF
#pragma config BOR      = ON
#pragma config BORV     = 3
#pragma config VREGEN   = ON        //USB Voltage Regulator
#pragma config WDT      = OFF
#pragma config WDTPS    = 32768
#pragma config MCLRE    = ON
#pragma config LPT1OSC  = OFF
#pragma config PBADEN   = OFF   
#pragma config STVREN   = ON
#pragma config LVP      = OFF
#pragma config XINST    = OFF       // Extended Instruction Set
#pragma config CP0      = OFF
#pragma config CP1      = OFF
#pragma config CPB      = OFF
#pragma config WRT0     = OFF
#pragma config WRT1     = OFF
#pragma config WRTB     = OFF       // Boot Block Write Protection
#pragma config WRTC     = OFF
#pragma config EBTR0    = OFF
#pragma config EBTR1    = OFF
#pragma config EBTRB    = OFF
 
 
//  Definitions
#define LCD_DD7     LATDbits.LATD7  // LCD data pin 7
#define LCD_DD6     LATDbits.LATD6  // LCD data pin 6
#define LCD_DD5     LATDbits.LATD5  // LCD data pin 5
#define LCD_DD4     LATDbits.LATD4  // LCD data pin 4
#define LCD_DATA    LATD
#define LCD_RS      LATBbits.LATB4  // LCD Register Select SK40C
#define LCD_E       LATBbits.LATB5  // LCD Enable pin SK40C
 
# define Motor  PORTDbits.RD0   
# define Fan    PORTDbits.RD1 
# define Blower PORTDbits.RD2       
# define Lamp   PORTDbits.RD3
 
 
#define sw1         PORTBbits.RB0
 
 
 
//  Function Prototypes
//------LCD------------
void lcd_init(void);
void lcd_4bit_write(unsigned char data);
void lcd_config(unsigned char command);
void lcd_putchar(unsigned char data);
void lcd_putstr(rom const char *str);
void lcd_clear(void);
void lcd_home(void);
void lcd_set_cursor(unsigned char uc_column, unsigned char uc_row); // uc_column is 0 for first character, 
void lcdprint(unsigned char x,unsigned char *str) ;                                                                 // uc_row is 0 for 1st line
void lcd_goto(unsigned char address);                               // move cursor with the address according to datasheet of LCD
void lcd_e_clock(void);
void lcd_send_dec(unsigned long data,unsigned char num_of_digit);
 
//-----DELAY-----------
void delay_ms(unsigned int ui_data);                                // delay in millisecond, maximum value is 65,535; 0 will result in 65536 millisecond of delay
void delay_us(unsigned char uc_data);                               // delay in microsecond, maximum value is 255; 0 will result in 256 microsecond of delay
void delay (unsigned long i);
 
//-----PIN INITIALIZATION-----------
void init_io ( void ) ;
    
//-----GLOBAL VARIABLE-----
unsigned int result;
        
void main(void)
{   
    
 
    init_io();
    lcd_init();                         // Initialize LCD
    lcd_clear();
    delay(400);
    lcdprint(0x00+2,"AUTOMATIC");
    lcdprint(0x40+1,"SHOE DRYER");
    delay(50000);
//  lcd_clear();
//  delay(200);
 
    
    while(1)            //if button SW1 is pressed
            {   
                
                    if(sw1==0)
                    {
                    lcd_clear();
                    lcdprint(0x00+3,"PLEASE WAIT");
                    lcdprint(0x40+1," THANK YOU :)");
                    delay(50000);
 
    //          delay(2000);
 
                    Motor = 1;      
                    Lamp = 1;
                    Blower =1;
                    delay(6000000);
                    }
 
                    else 
                    {
                        Motor = 0;
                        Lamp = 0;
                        Blower =1;
                    }   
            }
            
ADCON0 = 0b00000001;    // bit5-2 0000 select channel 0 conversion 
// bit1  A/D conversion status bit
//      1- GO to starts the conversion
//      0 - DONE when A/D is completed
// bit0   Set to 1 to power up A/D
 
ADCON1 = 0b00001100; // bit5   reference is VSS
// bit4   reference is VDD
// bit3-0 AN2 to AN0 Analog, the rest Digital
 
ADCON2 = 0b00010110; // bit7   : A/D Result Format. 0 Left, 1 Right justified ( Set it to 1, Right Justified)
// bit5-3 : 010 acquisition time = 4 TAD
// bit2-0 : 110 conversion clock = Tosc / 16
 
for(;;)
{
       unsigned int t; // variable for temperature
       
 
ADCON0bits.GO = 1; // This is bit2 of ADCON0, START CONVERSION NOW
       
while(ADCON0bits.GO == 1); // Waiting for DONE
 
        t=(ADRESH * 0.48876); //Convert to Degree Celcius - ADRES (16bit) is the output of ADC
}
 
 
}   
 
//-----------------------
//-----Functions-----
//-----------------------
 
// Initialize the I/O port direction.
void init_io () 
    {
    
    TRISA = 0b00000001;
    TRISB = 0b11001111;
    TRISC = 0b11111111;
    TRISD = 0b00000000;
    TRISE = 0b00000000;
 
    PORTA = 0b00000000;
    PORTB = 0b00000000;
    PORTC = 0b11111111;
    PORTD = 0b00000000;
    PORTE = 0b00000000;
 
    }
 
//-----LCD-------
//4-bit mode configuration 
void lcd_init()
{
    delay_ms(30);                               // wait for 30ms after power ON for LCD internal controller to initialize itself
    LCD_E = 1;
 
    //Set lcd to configuration mode
    LCD_RS = 0;                                 // Selected command register
    delay_us(5);                                // macro from HITECH compiler to generate code to delay for 1 microsecond base on _XTAL_FREQ value
    
    LCD_DATA = (LCD_DATA & 0x0F) | 0b00110000;  //make it in 8-bit mode first, for 3 times
    lcd_e_clock();
    delay_ms(2);
 
    LCD_DATA = (LCD_DATA & 0x0F) | 0b00110000;  //make it in 8-bit mode first, for 3 times
    lcd_e_clock();
    delay_ms(2);
 
    LCD_DATA = (LCD_DATA & 0x0F) | 0b00110000;  //make it in 8-bit mode first, for 3 times
    lcd_e_clock();
    delay_ms(2);
    
    LCD_DATA = (LCD_DATA & 0x0F) | 0b00100000;  //make it in 4-bit mode
    lcd_e_clock();
    delay_ms(2);            
        
    //start sending command in 4 bit mode
    //Function Set
    lcd_config(0b00101000);  // 0b 0 0 1 ID N F X X                             
                             // Interface Data Length, ID= 4-bit
                             // Number of line to display, N = 1 is 2 line display, N = 0 is 1 line display
                             // Display Font, F = 0 is 5x 8 dots, F = 1 is 5 x 11 dots
    
    //Command Entry Mode
    lcd_config(0b00000110);  // 0b 0 0 0 0 0 1 ID SH
                             // ID  = 1, cursor automatic move to right, increase by 1
                             // SH = 0,  shift of entire display is not perform                                 
        
    //Display Control
    lcd_config(0b00001110);  // 0b 0 0 0 0 1 D C B
                             // D  = 1, Display is ON
                             // C = 0,  Cursor is not display
                             // B = 0. Cursor does not blink                    
    
    lcd_clear();             // clear LCD and move the cursor back to home position
}
 
//Routine to send data to LCD via 2 nibbles in 4-bit mode
void lcd_4bit_write(unsigned char data)         
{                                       
    LCD_DATA = (LCD_DATA & 0x0F) | (data & 0xF0); // send out the Most Significant Nibble
    lcd_e_clock();
    
    LCD_DATA = (LCD_DATA & 0x0F) | (data << 4);   // send out the Least Significant Nibble
    lcd_e_clock();              
}
 
//Routine to send command to LCD
void lcd_config(unsigned char command)
{
    LCD_RS = 0;                 //Selected command register
    delay_us(5);
    lcd_4bit_write(command);    //Send command via 2 nibbles 
    delay_ms(1); 
}
 
//Routine to send display data (single character) to LCD
void lcd_putchar(unsigned char data)
{
    LCD_RS = 1;                 //Selected data register
    delay_us(5);
    lcd_4bit_write(data);       //Send display via 2 nibbles
    delay_ms(1); 
}
 
//Routine to send string to LCD
void lcd_putstr(rom const char *str)
{
    while(*str != '\0')         //loop till string ends
    {
        lcd_putchar(*str++);    //send characters to LCD one by one                 
    }       
}
 
//Routine to clear the LCD
void lcd_clear(void)
{
    lcd_config(0x01);           //command to clear LCD
    delay_ms(1);
}
 
//function to move LCD cursor to home position
void lcd_home(void)
{
    lcd_config(0x02);           //command to move cursor to home position
    delay_ms(1);
}
 
//Rountine to set cursor to the desired position base on coordinate, column and row
/*Place a string in the specified row and column of the screen.
* +--+--+--+--+--+---------------------+
* |0 |1 |2 |3 |4 |5 ...etc             | <- row 0
* +--+--+--+--+--+---------------------+
* |0 |1 |2 |3 |4 |5 ...etc             | <- row 1
* +--+--+--+--+--+---------------------+
*/
 
void lcd_set_cursor(unsigned char uc_column, unsigned char uc_row)
{
    if(uc_row == 0) lcd_config(0x80 + uc_column);   //command to move cursor to first row/line with offset of column
    else if(uc_row ==1 ) lcd_config(0xC0 + uc_column);  //command to move cursor to 2nd row/line with offset of column
}
    
//Rountine to set cursor to the desired position base on LCD DDRAM address
/*Place a string in the specified row and column of the screen.
* +--+--+--+--+--+---------------------+
* |0x00 |0x01 |0x02 |0x03 |0x04 |0x05  ...etc          |0x0F| <- 1st line
* +--+--+--+--+--+---------------------+
* |0x40 |0x41 |0x42 |0x43 |0x44 |0x45 ...etc           |0x4F| <- 2nd line
* +--+--+--+--+--+---------------------+
*/
 
void lcd_goto(unsigned char address)
{
     lcd_config(0x80 + address);    //command to move cursor to desire position base on the LCD DDRAM address   
}
 
// function to output enable clock pulse to LCD
void lcd_e_clock(void)
{
    delay_us(10);   
    LCD_E = 0;                      // create a falling edge for Enable pin of LCD to process data
    delay_us(100);
    LCD_E = 1;                      // pull the Enable pin high again
    delay_us(100);  
}   
 
// Simple delay function
// delay in milli second, maximum value for ui_data is 65,535.
void delay_ms(unsigned int ui_data)
{
    for(;ui_data > 0; ui_data--) 
    {
        Delay10KTCYx(1);            // to obtain 1 millisecond, we require 12K cycle of instruction if CPU clock is 48MHz
        Delay1KTCYx(2);             // Delay macro from MCC18 Compiler
    }
}
 
// delay in milli second, maximum value for ui_data is 65,535.
void delay_us(unsigned char uc_data)
{
    for(;uc_data > 0; uc_data--) 
    {
        Delay10TCYx(1);             // to obtain 1 microsecond delay, we require 12 cycle of instruction if CPU clock is 48MHz      
    }
}
void delay (unsigned long i)
{
    for (; i>0; i-=1);
}
void lcd_send_dec(unsigned long data,unsigned char num_of_digit)
{
    if(num_of_digit>=7)
    {
        data=data%10000000;
        lcd_4bit_write(data/1000000+0x30);
    }   
    if(num_of_digit>=6)
    {
        data=data%100000;
        lcd_4bit_write(data/10000+0x30);
    }       
    if(num_of_digit>=5)
    {
        data=data%100000;
        lcd_4bit_write(data/10000+0x30);
    }   
    if(num_of_digit>=4)
    {
        data=data%10000;
        lcd_4bit_write(data/1000+0x30);
    }
    if(num_of_digit>=3)
    {
        data=data%1000;
        lcd_4bit_write(data/100+0x30);
    }
    if(num_of_digit>=2)
    {
        data=data%100;
        lcd_4bit_write(data/10+0x30);
    }
    if(num_of_digit>=1)
    {
        data=data%10;
        lcd_4bit_write(data+0x30);
    }
}
void lcdprint(unsigned char x,unsigned char *str) 
{ 
lcd_goto(x); 
lcd_putstr(str); 
}

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