zdravim machri. neviete niekto preco nechce slapat DS18s20 s MEGA8? kod je odniekial z webu, priposobeny pre moje porty. celkom chapem co to ma robit, ale nechapem preco to nerobi 
#include "avr\io.h"
#include "util\delay.h"
#include "avr\iom8.h"
#include "util\lcd.c"
#include "avr\interrupt.h"
#include "avr/pgmspace.h"
#include "inttypes.h"
#include "stdlib.h"
#define THERM_DECIMAL_STEPS_12BIT 625 //.0625
#define THERM_CMD_CONVERTTEMP 0x44
#define THERM_CMD_RSCRATCHPAD 0xbe
#define THERM_CMD_WSCRATCHPAD 0x4e
#define THERM_CMD_CPYSCRATCHPAD 0x48
#define THERM_CMD_RECEEPROM 0xb8
#define THERM_CMD_RPWRSUPPLY 0xb4
#define THERM_CMD_SEARCHROM 0xf0
#define THERM_CMD_READROM 0x33
#define THERM_CMD_MATCHROM 0x55
#define THERM_CMD_SKIPROM 0xcc
#define THERM_CMD_ALARMSEARCH 0xec
#define THERM_PORT PORTB
#define THERM_DDR DDRB
#define THERM_PIN PINB
#define THERM_DQ PB0
#define THERM_INPUT_MODE() THERM_DDR&=~(1<<THERM_DQ)
#define THERM_OUTPUT_MODE() THERM_DDR|=(1<<THERM_DQ)
#define THERM_LOW() THERM_PORT&=~(1<<THERM_DQ)
#define THERM_HIGH() THERM_PORT|=(1<<THERM_DQ)
char buffer[16];
}
uint8_t therm_reset(void){
uint8_t i;
//Pull line low and wait for 480uS
THERM_LOW();
THERM_OUTPUT_MODE();
_delay_us(480);
//Release line and wait for 60uS
THERM_INPUT_MODE();
_delay_us(60);
//Store line value and wait until the completion of 480uS period
i=(THERM_PIN & (1<<THERM_DQ));
_delay_us(420);
//Return the value read from the presence pulse (0=OK, 1=WRONG)
return i;
}
void therm_write_bit(uint8_t bit){
//Pull line low for 1uS
THERM_LOW();
THERM_OUTPUT_MODE();
_delay_us(1);
//If we want to write 1, release the line (if not will keep low)
if(bit) THERM_INPUT_MODE();
//Wait for 60uS and release the line
_delay_us(60);
THERM_INPUT_MODE();
};
uint8_t therm_read_bit(void){
uint8_t bit=0;
//Pull line low for 1uS
THERM_LOW();
THERM_OUTPUT_MODE();
_delay_us(1);
//Release line and wait for 14uS
THERM_INPUT_MODE();
_delay_us(14);
//Read line value
if(THERM_PIN&(1<<THERM_DQ)) bit=1;
//Wait for 45uS to end and return read value
_delay_us(45);
return bit;
}
uint8_t therm_read_byte(void){
uint8_t i=8, n=0;
while(i--){
//Shift one position right and store read value
n>>=1;
n|=(therm_read_bit()<<7);
}
return n;
}
void therm_write_byte(uint8_t byte){
uint8_t i=8;
while(i--){
//Write actual bit and shift one position right to make the next bit ready
therm_write_bit(byte&1);
byte>>=1;
}
}
void therm_read_temperature(char *buffer){
// Buffer length must be at least 12bytes long! "+XXX.XXXX C"]
uint8_t temperature[2];
int8_t digit;
uint16_t decimal;
//Reset, skip ROM and start temperature conversion
therm_reset();
therm_write_byte(THERM_CMD_SKIPROM);
therm_write_byte(THERM_CMD_CONVERTTEMP);
//Wait until conversion is complete
while(!therm_read_bit());
//Reset, skip ROM and send command to read Scratchpad
therm_reset();
therm_write_byte(THERM_CMD_SKIPROM);
therm_write_byte(THERM_CMD_RSCRATCHPAD);
//Read Scratchpad (only 2 first bytes)
temperature[0]=therm_read_byte();
temperature[1]=therm_read_byte();
therm_reset();
//Store temperature integer digits and decimal digits
//digit=temperature[0]>>4;
//digit|&=temperature[1]&0x7;
//Store decimal digits
//decimal=temperature[0]&0xf;
//decimal*=THERM_DECIMAL_STEPS_12BIT;
//zmenil som prevod na decimalne hodnotym aby som videl ake byty a bity to posiela
itoa(temperature[0], buffer, 2);
lcd_gotoxy(0,0);
lcd_puts(buffer);
itoa(temperature[1], buffer, 2);
lcd_gotoxy(0,1);
lcd_puts(buffer);
}
int main(void)
{
lcd_init(LCD_DISP_ON) ;
lcd_command(LCD_FUNCTION_4BIT_2LINES);
lcd_clrscr();
while (1)
{
therm_read_temperature(buffer); //naco je tento parameter???
_delay_ms(100);
}
} vypisuje to len 6bitov z prveho bytu (a menia sa podla teploty), a iba jednu nulu z druheho bytu, nic viac. to je asi malo na prevod na teplotu v °C, ze? . Pozrite sa na to niekto, mozno len nevidim chybu v kode… ked z toho dostanem tie spravne bity, premenit ich uz budem vediet 
.
Vdaka. Riso