Membuat termometer digital dengan LM35 dan mikrokontroller ATmega8535

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Untuk programnya menggunakan Code Vision AVR;

berikut programnya:





/*****************************************************
This program was produced by the
CodeWizardAVR V2.03.9 Standard
Automatic Program Generator
© Copyright 1998-2008 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project : Termometer digital
Version : 1.0
Date    : 12/13/2012
Author  : Bayu Sasongko
Company : Teknik Elektro UNILA
Comments: Sipp dah


Chip type               : ATmega8535
Program type            : Application
AVR Core Clock frequency: 12.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 128
*****************************************************/

#include <mega8535.h>
#include <stdio.h>

#asm
   .equ __lcd_port=0x15 ;
#endasm
#include <lcd.h>
#include <delay.h>
#include <stdlib.h>


unsigned char kata[16];
int data_suhu,x;
float suhu_celcius;

#define ADC_VREF_TYPE 0x40

// Read the AD conversion result
unsigned int read_adc(unsigned char adc_input)
{
ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCW;
}

void main(void)
{
ADMUX=ADC_VREF_TYPE & 0xff;
ADCSRA=0x84;
SFIOR&=0xEF;

lcd_init(16);

for(x=0;x<=2;x++)
{
lcd_gotoxy(5,0);
lcd_putsf("-ETEKNO-");
delay_ms(100);
lcd_clear();
delay_ms(100);
}

while (1)
      {   
         data_suhu = read_adc(0);
         suhu_celcius = ((float)data_suhu*500/1023);   //Rubah kecelcius              
         ftoa(suhu_celcius,2,kata); 
         
         lcd_gotoxy(2,0);
         lcd_putsf("SUHU SAAT INI");
         
         lcd_gotoxy(4,1);  
         lcd_puts(kata); 
         
         lcd_gotoxy(9,1);
         lcd_putchar(0xdf);//menampilkan karakter derajat
         lcd_putsf("C");  
         
         delay_ms(100);         
                 
      };
}

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