Interfacing Atmega 16A with LM35 and LCD

[Rajib Saha]

hi frnds i am trying to interface Atmega16A with LM35 and LCD that is i am trying to see the temperature on Lcd..but some how my code is not working on hardware….pls help

my codes…

header for lcd

 

 

#ifndef LCD_H_

#define LCD_H_

 

 

#define rs PA7

#define rw PA6

#define en PA4

 

#define F_CPU 16000000UL

#include<avr/io.h>

#include<util/delay.h>

#include<inttypes.h>

 

void lcd_init();

void dis_cmd(char);

void dis_data(char);

void lcdcmd(char);

void lcddata(char);

void clrscr();

void gotoxy(char,char);

void LCD_write_string(const char *);

 

void LCD_write_string(const char *str) //store address value of the string in pointer *str

{

int i=0;

while(str!='') // loop will go on till the NULL character in the string

{

dis_data(str); // sending data on LCD byte by byte

i++;

}

return;

}

 

 

 

 

 

 

void lcd_init() // function for initialize

{

DDRA=0xFF;

dis_cmd(0x02); // to initialize LCD in 4-bit mode.

dis_cmd(0x28); //to initialize LCD in 2 lines, 5X7 dots and 4bit mode.

dis_cmd(0x0C);

dis_cmd(0x06);

 

dis_cmd(0x80); // 8– 1st line 0- 0TH position

}

 

void dis_cmd(char cmd_value)

{

char cmd_value1;

 

cmd_value1 = ((cmd_value>>4) & 0x0F); //shift 4-bit and mask

lcdcmd(cmd_value1); // send to LCD

 

cmd_value1 = cmd_value & 0x0F; //mask lower nibble because PA4-PA7 pins are used.

lcdcmd(cmd_value1); // send to LCD

}

 

 

void dis_data(char data_value)

{

char data_value1;

 

data_value1=((data_value>>4)&0x0F);

 

lcddata(data_value1);

 

data_value1=data_value&0x0F;

lcddata(data_value1);

}

 

void lcdcmd(char cmdout)

{

PORTA=cmdout;

PORTA&=~(1<<rs);

PORTA&=~(1<<rw);

PORTA|=(1<<en);

_delay_ms(1);

PORTA&=~(1<<en);

}

 

void lcddata(char dataout)

{

PORTA=dataout;

PORTA|=(1<<rs);

PORTA&=~(1<<rw);

PORTA|=(1<<en);

_delay_ms(1);

PORTA&=~(1<<en);

}

void clrscr()

{

_delay_ms(100);

dis_cmd(0x01);

_delay_ms(10);

}

void gotoxy(char a,char b)

{

 

if(a==0)  a=0b10000000;

else if(a==1) a=0b11000000;

 

dis_cmd(a|b); 

}

#endif

 

                                                                   The Main program

 

 

/*

 * temperature.c

 *

 * Created: 10-03-2015 23:07:08

 *  Author: rajib saha

 */ 

 

#define F_CPU 16000000UL

#include <avr/io.h>

#include <util/delay.h>

#include <stdlib.h>

#include "lcd.h"

void ADC_init(void);

unsigned int ADC_read(unsigned char);

int main(void)

{

//void adc_conv();

DDRA=0x00;

//DDRD=0x03;

//ADC_init(); // Initialization of ADC

// ch=0;

while(1)

{

  

   unsigned int value;

float farhen,celsius;

char buffer[10];

   value=ADC_read(0);

//PORTA=value;

        farhen = (value*9.0/5.0+32.0);

celsius = (value*0.49);

lcd_init();

LCD_write_string("Temperature is");

gotoxy(2,1);

itoa(farhen,buffer,10);

LCD_write_string(buffer);

LCD_write_string("C");

itoa(celsius,buffer,10);

gotoxy(2,4);

LCD_write_string(buffer);

LCD_write_string("F");

_delay_ms(500);

}

 //return(0);

}

void ADC_init(void) // Initialization of ADC

{

ADMUX=(1<<REFS0); // AVcc with external capacitor at AREF

ADCSRA=(1<<ADEN)|(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);// Enable ADC and set Prescaler division factor as 128

 

}

 

unsigned int ADC_read(unsigned char ch)

{

ch= ch & 0b00000111; // channel must be b/w 0 to 7

ADMUX |= ch; // selecting channel

 

ADCSRA|=(1<<ADSC); // start conversion

while(!(ADCSRA & (1<<ADIF))); // waiting for ADIF, conversion complete

ADCSRA|=(1<<ADIF); // clearing of ADIF, it is done by writing 1 to it

 

return (ADC);

}

 

 

 

[Ashutosh Bhatt]

where is ur itoa function?

i dont see any function that converts HEX value available from ADC into decimal and then into ASCII

[Author]

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