SENSOR SUHU LM35 SEBAGAI PENGONTROL NYALA KIPAS

A. Rangkaian Simulasi





B. Program
#include mega16.h
#include stdlib.h
#include lcd.h
#include delay.h
#define kurangi_suhu_kipas    PIND.6
#define tambah_suhu_kipas   PIND.7

// Alphanumeric LCD Module functions
#asm
   .equ __lcd_port=0x15 ;PORTC
#endasm
int SUHU;
char temp[8];
float suhu_celcius;
unsigned char suhu_kipas,simpan;
eeprom unsigned char p_eeprom;
void tulis_eeprom()
{
        p_eeprom=simpan;
}

void baca_eeprom()
{
        simpan=p_eeprom;
}

#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)
{
PORTB=0xFF;
DDRB=0xFF;

PORTD=0xFF;
DDRD=0xFF;
suhu_kipas=24;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// ADC initialization
// ADC Clock frequency: 750.000 kHz
// ADC Voltage Reference: AVCC pin
// ADC Auto Trigger Source: None
ADMUX=ADC_VREF_TYPE & 0xff;
ADCSRA=0x84;

// LCD module initialization
lcd_init(16);
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("ALAT PENGONTROL");
lcd_gotoxy(0,1);
lcd_putsf("KIPAS DENGAN");
delay_ms(50);
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("SENSOR SUHU LM35");
delay_ms(50);

while (1)
    {
    lcd_clear( );
    SUHU = read_adc(3);
    suhu_celcius = (float)SUHU*425/1023;//rumus untuk mengubah kedalam derajat celcius  
    lcd_gotoxy(0,0);
    lcd_putsf("SUHU RUANG");
    ftoa(suhu_celcius,0,temp);//float to array, mengubah tipedata float k tipe data array yg kan ditampilkan di LCD
    lcd_gotoxy(12,0); 
    lcd_puts(temp);
   
    lcd_gotoxy(14,0);
    lcd_putchar(0x89);//menampilkan karakter derajat
    lcd_putsf("C");
   
    lcd_gotoxy(0,1);
    lcd_putsf("KPS ON SH >");
    ftoa(simpan,0,temp);
    lcd_gotoxy(12,1); 
    lcd_puts(temp);
    lcd_gotoxy(14,1);
    lcd_putchar(0x89);//menampilkan karakter derajat
    lcd_putsf("C");
    if(kurangi_suhu_kipas==0){suhu_kipas--;delay_ms(300);simpan=suhu_kipas;tulis_eeprom();}
    if(tambah_suhu_kipas==0){suhu_kipas++;delay_ms(300);simpan=suhu_kipas;tulis_eeprom();}
    baca_eeprom();
    //if(kurangi_suhu_kipas==0){suhu_kipas--;delay_ms(300);}
    //if(tambah_suhu_kipas==0){suhu_kipas++;delay_ms(300);}
    if(suhu_celcius>simpan){PORTB.0=1;}
    else PORTB.0=0;                                                
    delay_ms(5);
    };
}


C. Rangkaian Implementasi

rangkaian simulasi+program dapat di download disini