/// <summary>
/// Read sensor data
/// </summary>
/// <returns>true on success, else false</returns>
public override bool Read()
{
if (Address != null && Address.Length == 8 && Address[0] == FAMILY_CODE)
{
//now write command and ROM at once
byte[] cmdAndData = new byte[9] {
0x55, //match ROM command
Address[0], Address[1], Address[2], Address[3], Address[4], Address[5], Address[6], Address[7] //do not convert to a for..loop
};
_oneWire.TouchReset();
foreach (var b in cmdAndData)
{
_oneWire.WriteByte(b);
}
//now read the scratchpad
var verify = _oneWire.WriteByte(READ_SCRATCHPAD);
//Now read the temperature
var tempLo = _oneWire.ReadByte();
var tempHi = _oneWire.ReadByte();
if (_oneWire.TouchReset())
{
float currentTemperature = ((tempHi << 8) | tempLo) / 16;
TemperatureInCelcius = (float)(Math.Floor(currentTemperature * Math.Pow(10, _scale)) / Math.Pow(10, _scale));
}
else
{
TemperatureInCelcius = ERROR_TEMPERATURE;
}
}
return(TemperatureInCelcius != ERROR_TEMPERATURE);
}
/// <summary>
/// Read sensor data
/// </summary>
/// <returns>true on success, else false</returns>
public bool Read()
{
SelectDevice();
//now read the scratchpad
var verify = _oneWire.WriteByte(READ_SCRATCHPAD);
//Now read the temperature
var tempLo = _oneWire.ReadByte();
var tempHi = _oneWire.ReadByte();
if (_oneWire.TouchReset())
{
var temp = ((tempHi << 8) | tempLo);
// Bits manipulation to represent negative values correctly.
if ((tempHi >> 7) == 1)
{
temp = (temp | unchecked ((int)0xffff0000));
}
TemperatureInCelcius = ((float)temp) / 16;
return(true);
}
else
{
TemperatureInCelcius = ERROR_TEMPERATURE;
return(false);
}
}