nick /224 /temp

#include 

// DS18B20 Temperature chip i/o

OneWire ds(5);  // on pin 5

void setup(void) {
  // initialize inputs/outputs
  // start serial port
  Serial.begin(9600);
}

void loop(void) {
  int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;
  byte i;
  byte present = 0;
  byte data[12];
  byte addr[8];

  if ( !ds.search(addr)) {
      //Serial.print("No more addresses.\n");
      ds.reset_search();
      return;
  }

  //Serial.print("R=");
  //for( i = 0; i < 8; i++) {
    //Serial.print(addr[i], HEX);
    //Serial.print(" ");
  //}

  if ( OneWire::crc8( addr, 7) != addr[7]) {
      Serial.print("CRC is not valid!\n");
      return;
  }

  if ( addr[0] != 0x28) {
      Serial.print("Device is not a DS18S20 family device.\n");
      return;
  }

  ds.reset();
  ds.select(addr);
  ds.write(0x44,1);         // start conversion, with parasite power on at the end

  delay(1000);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.

  present = ds.reset();
  ds.select(addr);
  ds.write(0xBE);         // Read Scratchpad

  //Serial.print("P=");
  //Serial.print(present,HEX);
  //Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
    //Serial.print(data[i], HEX);
    //Serial.print(" ");
  }
  //Serial.print(" CRC=");
  //Serial.print( OneWire::crc8( data, 8), HEX);
  //Serial.println();

  int rawtemp = (data[1] << 8) + data[0];
  double tempc, tempf;
  tempc = (double)rawtemp / 2.0;
  tempf = (tempc * 1.8) + 32.0;

  //Serial.print("T=");
  //Serial.println(tempf,DEC);

  LowByte = data[0];
  HighByte = data[1];
  TReading = (HighByte << 8) + LowByte;
  SignBit = TReading & 0x8000;  // test most sig bit
  if (SignBit) // negative
  {
    TReading = (TReading ^ 0xffff) + 1; // 2's comp
  }
  Tc_100 = (6 * TReading) + TReading / 4;    // multiply by (100 * 0.0625) or 6.25

  Whole = Tc_100 / 100;  // separate off the whole and fractional portions
  Fract = Tc_100 % 100;


  if (SignBit) // If its negative
  {
     Serial.print("-");
  }
  Serial.print(Whole);
  Serial.print(".");
  if (Fract < 10)
  {
     Serial.print("0");
  }
  Serial.print(Fract);

  Serial.print("\n");
}