Lm35 interfacing with PIC18F4680 and display on LCD

[jatin.chotaliya]

guys plz help me im beginner for pic n im unable to get output
code :

// LCD module connections
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
// End LCD module connections
unsigned int adc_rd;
#include <built_in.h>



char txt[11];
float temp;

//char txt1[] = "mikroElektronika";
//char txt2[] = "EasyPIC6";
//char txt3[] = "Lcd4bit";
//char txt4[] = "example";

char i;
void display()
{
TRISA = 0xFF ;
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF);
adc_rd =ADC_read(2);
temp = adc_rd/200;



FloatToStr(temp, txt); // Cursor off
Lcd_Out(1,1,txt);
} // Loop variable



void main(){
ANSEL = 0x04; // Configure AN pins as digital I/O
ANSELH = 0;
C1ON_bit = 0; // Disable comparators
C2ON_bit = 0;
ADCON1 |= 0x0C; // Set AN2 channel pin as analog
// TRISA2_bit |= 0x04;

// _ADC_Init();

Lcd_Init(); // Initialize LCD



while(1) { // Endless loop

display();
}
}

 

[xpress_embedo]

https://sites.google.com/site/coole...0/tutorial-list/temperature-monitoring-system

Have a look at the above link..
Very Good Tutorial, but for PIC18F4550..

I am reading your code and will try to find any solution..
Till then then have a look at the above link..

Hope this helps

---------- Post added at 22:23 ---------- Previous post was at 22:20 ----------

Also have a look at this code, written in mikroC for PIC16F877A micro-controller, to display the adc_data as it is on LCD,

// LCD module connections
sbit LCD_RS at RB2_bit;
sbit LCD_EN at RB3_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;

sbit LCD_RS_Direction at TRISB2_bit;
sbit LCD_EN_Direction at TRISB3_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connections

unsigned int adc_value;
unsigned char string[16];

void main()
{

 TRISB = 0x00;
 Lcd_Init();
 UART1_Init(9600);
 Delay_ms(100);
 Lcd_Cmd(_LCD_CLEAR);               // Clear display
 Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off
 Lcd_Out(1,1,"TESTING...");
 UART1_Write_Text("Arun Sharma");
 Delay_ms(1000);
 Lcd_Cmd(_LCD_CLEAR);
 TRISA = 0xFF;
 ADCON0 = 0x81;
//Fosc/64 is Selected
//Channel-0 is Selected
//Analog-to-Digital Converter Module is Powered Up
/*************************************************/
 ADCON1 = 0xCE;        //Only Channel One is Analog Channel while all others are Digital I/O
//A/D Result Format Select Bit Right Justified
//and AN0 Channel as Analog Channel
/***************************************************/
 ADC_Init();
 Delay_ms(100);
 Lcd_Out(1,1,"ADC OUTPUT");
 while(1)
 {
   adc_value = ADC_Read(0);
   IntToStr(adc_value,String);
   Lcd_Out(2,1,String);
   UART1_Write_Text("Arun Sharma");
   UART1_Write(10);
   UART1_Write(13);
   Delay_ms(1000);
 }
}

and in your code change these statement as follow :-

void display()
{
TRISA = 0xFF ;
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF);
adc_rd =ADC_read(2);

IntToStr(adc_rd, txt); // Cursor off
Lcd_Out(1,1,txt);
} // Loop variable

First Check whether your ADC is working or not then try to get the data which you want

Hope this helps