float ds1820_read()
{
int8 busy=0, temp1, temp2;
signed int16 temp3;
float result;

onewire_reset();
onewire_write(0xCC);
onewire_write(0x44);

while (busy == 0)
   busy = onewire_read();

onewire_reset();
onewire_write(0xCC);
onewire_write(0xBE);
temp1 = onewire_read();
temp2 = onewire_read();
temp3 = make16(temp2, temp1);

result = (float) temp3 / 16.0;  //calculation pro DS18B20 with 0.1 deg C


   delay_ms(200);
   return(result);

}