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void OneWireOutByte (int Pin, byte d) // output byte d (least sig bit first).
{
byte n;

for (n=8; n!=0; n--)
{
if ((d & 0x01) == 1) // test least sig bit
{
digitalWrite (Pin, LOW);
pinMode (Pin, OUTPUT);
delayMicroseconds (5);
pinMode (Pin, INPUT);
delayMicroseconds (60);
}
else
{
digitalWrite (Pin, LOW);
pinMode (Pin, OUTPUT);
delayMicroseconds (60);
pinMode (Pin, INPUT);
}

d = d>>1; // now the next bit is in the least sig bit position.
}
}


byte OneWireInByte (int Pin) // read byte, least sig byte first
{
byte d, n, b;

for (n=0; n<8; n++)
{
digitalWrite (Pin, LOW);
pinMode (Pin, OUTPUT);
delayMicroseconds (5);
pinMode (Pin, INPUT);
delayMicroseconds (5);
b = digitalRead (Pin);
delayMicroseconds (50);
d = (d >> 1) | (b7); // shift d to right and insert b in most sig bit position
}
return (d);
}


void getCurrentTemp (char *temp)
{
int HighByte, LowByte, TReading, Tc_100, sign, whole, fract;

OneWireReset (REF_PIN);
OneWireOutByte (REF_PIN, 0xcc);
OneWireOutByte (REF_PIN, 0x44); // perform temperature conversion, strong pullup for one sec

OneWireReset (REF_PIN);
OneWireOutByte (REF_PIN, 0xcc);
OneWireOutByte (REF_PIN, 0xbe);

LowByte = OneWireInByte (REF_PIN);
HighByte = OneWireInByte (REF_PIN);
TReading = (HighByte 8) + LowByte;
sign = TReading & 0x8000; // test most sig bit
if (sign) // 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 (sign) {
temp[0] = '-';
} else {
temp[0] = '+';
}

if (whole/100 == 0) {
temp[1] = ' ';
} else {
temp[1] = whole/100+'0';
}

temp[2] = (whole-(whole/100)*100)/10 +'0' ;
temp[3] = whole-(whole/10)*10 +'0';
temp[4] = '.';
temp[5] = fract/10 +'0';
temp[6] = fract-(fract/10)*10 +'0';
temp[7] = '\0';
}