interfacing LM35 to 89c51 microcontroller.

#include<avr/io.h>
#include<util/delay.h>

#include "uart.h"

void ADC_Init();
float read_adc();

unsigned char ADC_calculating();
unsigned char a;
unsigned char b;

void main()
{

	char temp;

	_delay_ms(50);

	UART_Init(25);
	UART_TransmitString("To Display the Temperature in Centigrade \r\n");

	ADC_Init();
	
	while(1)
	{		
		//convert calue to tempature

		temp = ADC_calculating();

		a = temp % 10;
		b = temp / 10;
	
		_delay_ms(100);
				
		UART_TransmitByte(a+48);
		UART_TransmitByte(b+48);
		UART_TransmitString("\r\n");				

		_delay_ms(100);
	}
}

void ADC_Init()
{
	ADMUX  = (1<<REFS0);
	ADCSRA = 0x85;
}

float read_adc()
{
    //select the ADC channel  
	ADMUX |= _BV(0);
	
	//START THE ADC CONVERATION

	ADCSRA |= (1<<ADSC);

	//WAIT FOR CONVERATION TO COMPLETE

	while(!(ADCSRA) & (1<< ADIF));

	//CLEAR ADIF BY WRITING ONE TO IT

	ADCSRA |= (1<< ADIF);

	return(ADC);
}

unsigned char ADC_calculating()
{
	float ADC_VALUE = 0;
	float value=0; 

	ADC_VALUE = read_adc();

	value = ((ADC_VALUE)* 0.48876);
	
	return(value);
}

To	Display	the	Temperature	in	Centigrade
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