#include <xc.h>
#define _XTAL_FREQ 4000000
 
// PIC Configuration Bits
#pragma config FOSC = HS
#pragma config WDTE = OFF
#pragma config PWRTE = OFF
#pragma config BOREN = OFF
#pragma config LVP = OFF
#pragma config CPD = OFF
#pragma config WRT = OFF
#pragma config CP = OFF
 
// LCD Functions
void lcd_cmd(unsigned char cmd);
void lcd_data(unsigned char data);
void lcd_init();
void lcd_print(char *str);
 
void main() {
    // ADC and Ports setup
    ADCON1 = 0x80;   // Configure AN0 as analog, rest digital
    TRISA = 0x01;    // RA0 input (LM35)
    TRISB = 0x00;    // PORTB output (LCD)
 
    lcd_init();
    lcd_print("Temperature:");
 
    while(1) {
        // Start ADC on AN0
        ADCON0 = 0x41;   // ADC on, channel 0
        __delay_ms(2);
        GO_nDONE = 1;
        while(GO_nDONE);
 
        int adc = (ADRESH << 8) + ADRESL;
        float temp = adc * 0.488; // LM35 conversion
 
        // Display temperature on LCD
        lcd_cmd(0xC0);   // Second line
        lcd_data((int)temp/10 + '0');  // Tens
        lcd_data((int)temp%10 + '0');  // Ones
        lcd_data(223);    // Degree symbol
        lcd_data('C');
 
        __delay_ms(500);
    }
}
 
// Implement LCD functions here (4-bit mode)
void lcd_cmd(unsigned char cmd){
    PORTB = (cmd & 0xF0);  // Upper nibble
    RB1 = 1; RB0 = 0; __delay_ms(2); RB1 = 0; 
    PORTB = (cmd << 4);    // Lower nibble
    RB1 = 1; RB0 = 0; __delay_ms(2); RB1 = 0;
}
 
void lcd_data(unsigned char data){
    PORTB = (data & 0xF0); // Upper nibble
    RB1 = 1; RB0 = 1; __delay_ms(2); RB1 = 0;
    PORTB = (data << 4);   // Lower nibble
    RB1 = 1; RB0 = 1; __delay_ms(2); RB1 = 0;
}
 
void lcd_init(){
    __delay_ms(20);
    lcd_cmd(0x02); // Initialize LCD
    lcd_cmd(0x28); // 4-bit, 2 lines
    lcd_cmd(0x0C); // Display ON
    lcd_cmd(0x06); // Entry mode
}
 
void lcd_print(char *str){
    while(*str) lcd_data(*str++);
}
 

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