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/***************************************************************************

File : sht-11.c

Description : Main module

Project : SHT 11 Temperature & Humidity Sensor

Version : 2.0.1

Author : nashrul@nashrul.co.cc

Date : 2010

***************************************************************************/

#include

#include

#include

#include

#asm

.equ __lcd_port=0×15 ;PORTC

#endasm

#define io DDRB.1

#define sda_out PORTB.1

#define sda_in PINB.1

#define sck PORTB.0

#define temp 0b00000011

#define humi 0b00000101

#define read_reg 0b00000111

#define write_reg 0b00000110

union data_int{unsigned char c[sizeof unsigned int];unsigned int t;}sht;

unsigned char lcd[20],msbt,lsbt,msbh,lsbh,value;

unsigned int temperatur,humidity;

void initial()

{

io=1;

sda_out=1; //Initial state

sck=0;

delay_us(2);

sck=1;

delay_us(2);

sda_out=0;

delay_us(3);

sck=0;

delay_us(5);

sck=1;

delay_us(2);

sda_out=1;

delay_us(3);

sck=0;

}

//———————————————————————————-

void start()

//———————————————————————————-

// generates a transmission start

// _____ ________

// DATA: |_______|

// ___ ___

// SCK : ___| |___| |______

{unsigned char i;

io=1;

sda_out=1;

for (i = 0 ; i < 9 ; i++)

{

sck=1;

delay_us(1);

sck=0;

delay_us(1);

}

initial();

}

void kirim_perintah(unsigned char dat)

{

unsigned char x;

for ( x = 128 ;  x > 0 ;  x /= 2)

{

sck=0;

delay_us(1);

if  (x & dat)  sda_out=1;

else  sda_out=0;

sck=1;

delay_us(1);

};

}

unsigned char terima_data()

{ unsigned char x;

value = 0;

for (x = 128 ; x > 0 ; x /= 2)

{

sck = 0;

delay_ms(1);

if  (sda_in)  value=(value | x);

sck=1;

delay_ms(1);

};

sck=0;

delay_ms(2);

io=1;

sck=1;

sda_out = 0;

delay_ms(1);

io = 0;

return value;

}

void baca_sht(unsigned char xxx)

{

start();

kirim_perintah(xxx);

io=0;

sck=0;

delay_us(1);

sck=1;

if  (sda_in == 1) {goto end;};

delay_us(1);

sck=0;

delay_us(11);

while (sda_in==1);

sht.c[1]=terima_data();

sht.c[0]=terima_data();

end:

io=1;

sda_out=1;

}

void main(void)

{

PORTA=0×00;

DDRA=0×00;

PORTB=0×02;

DDRB=0×01;

PORTC=0×08;

DDRC=0×08;

PORTD=0×00;

DDRD=0×00;

ACSR=0×80;

SFIOR=0×00;

lcd_init(20);

while (1)

{

baca_sht(temp);

msbt=sht.c[1];

lsbt=sht.c[0];

temperatur=sht.t;

baca_sht(humi);

msbh=sht.c[1];

lsbh=sht.c[0];

humidity=sht.t;

// status_reg();

sprintf(lcd,”%3d %3d%8d”,msbt,lsbt,temperatur);

lcd_gotoxy(0,0); lcd_puts(lcd);

sprintf(lcd,”%3d %3d%8d”,msbh,lsbh,humidity);

lcd_gotoxy(0,1); lcd_puts(lcd);

// sprintf(lcd,”%3d %3d%8d”,value);

// lcd_gotoxy(0,2); lcd_puts(lcd);

};

}

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