Sensor TileBox Pro: How is the temperature value calculated?

Dear St

Now that I can read the data correctly, 

 private static double ReadTemperatureDataFiles(string[] files, double Delta, StreamWriter sw)
 {
 double timeValue = 0;
 Console.WriteLine("\n\r Reading the Temperature data files from the ST Sensor Tile Box..." +
 "\n\r\n\r Byte Offset Byte Value Temperature" +
 "\n\r [16] [4] C \n\r");

 byte[] fileBytes = File.ReadAllBytes(files[2]);
 byte[] byteArray1A = new byte[16];
 var len = (int)fileBytes.Length;
 int num = fileBytes.Length / 16;

 for (int it = 0; it < len; it += 16)
 {
 byte[] byteT = [fileBytes[it + 4], fileBytes[it + 5], fileBytes[it + 6], fileBytes[it + 7]]; // Example byte array
 float resultT = BitConverter.ToSingle(byteT); // Converts 4 bytes starting at index 0
 timeValue = Convert.ToDouble(resultT); // Convert to seconds
 Console.WriteLine(" " + it.ToString("000") + " " + byteT[0].ToString("000") + " " + byteT[1].ToString("000") + " " + byteT[2].ToString("000") + " " + byteT[3].ToString("000") + " " + timeValue.ToString("0.00"));
 }
 return timeValue;
 }

Clearly the JSON file tells me what to do, but my education is clearly lacking in translating decimal to floats,  I know I should have known that, the tyranny of knowledge is a bad thing.  

It still does not tell my why a NIST calibrated unit is off by about 10 C.  

I understand that I will not get an answer, but that is ok, I will get the other units one day and test them.  

Hello Federica:

I understand how to decode all of your data files from the Sensor Tile Box Pro. But the problem is the temperature may be because the device is heating up or it my be defective.  My old physics professor would expect me to work out how to determine the correct temperature allowing for the instrument.  

So why is the temperature important in structural engineering.  If we have a block, this could be any block, so it could be from the Medici building, that Professor Benedetti asked for help on in Firenze.  It was a temperature constant day in July, it was hot and the floors were X Hz and the walls Y Hz.  Professor Benedetti, who is a great guy to work with and drink with expected those answers.  

He wanted an instantaneous answer, the building was old and the decay rate was slow.  

Your temperature gauge, so I take a brick a cheap brick that is poorly made from a hardware company, there are no hardware companies that I found in the old city in Bologna, but just off the side of the big square that is in front of the church is the absolute best cafe in the world.  Across the square over the old Roman road is a good place to have dinner.  So you put the brick in a controlled environment with no noise, reasonably constant temperature and little human traffic, I had the choice of a noisy lab or a study. Always pick the study.  So this picture is a very bad FE model of the brick, but it is the start. The brick is held constant at the four corners of the red support material and the Sensor Tile Box Pro sits on the top of the overhang, you are looking at the bottom.  

End of Chapter One.  

Chapter 4

So the end of the short story.  

The final analysis looks at the change in frequency with time and temperature assuming, as we know it is, that it is linear or close enough.  We have about ten years of continuous data from a superb machine, sadly not made by ST.  Nor could I use an ST device as it is not evaluation.  

So for 232.4 Hz average in the vertical direction looking at a band width of 1 Hz, the loss rate is -11.5 milli Hz per day.  Now the critical feature I have been watching for days is the t Stat essentially it has to be greater than abs(2), it had not been up until now, it was trending but not there.  t Stat is the most important number in civil engineering. 

The change in the brick properties is large from temperature but temp has a limited numerical range, so once one gets to about 90 days the time is always dominant,  the brick is degrading quite quickly because it was poorly made and sold in mass.  It might last 20 years if we are lucky. The math to do that analysis is much more challenging and interesting.  And not something we share.  

An acceptable number below 30 Hz is 15 micro Hz per day, there is a thousand fold difference.  

There are 111 bricks per cubic meter at 3 USD each so 333 USD per cubic meter, wet concrete at normal strength is 200 USD per cubic metre, so to make money we take out the cement. The poor buying public have no idea  it looks good and we are a throw away society, 

So Federica the temperature is important and I still have to check that the device is accurate even if it has an offset.  

Warm regards

John

PS Bologna is the best city in the world and the University is good. Aside from the 1930's buildings.