About Sensor Data: Sensor Data was initially created to help in my application testing. I needed a single place where I could get all of the information the iPhone and iPod have to offer in real time. Nothing like this was available so I built the app according to my personal need. Of course, then I realized that it would be a great offering for everyone else as well!
FAQ:
Question: Why do the acceleration readings never stop changing?
Answer: No measuring device is perfect, and the accelerometers within the iPod and iPhone are no exception. My personal belief is that they were never designed for high-accuracy readings, but instead for large movements that could easily identify device orientation for rotations and such. If I had to guess, I would say the values are accurate to no better than 0.1 G.
Question: What do all the acceleration numbers mean?
Answer: The numbers to the right of "Now" are the real time data that each of the three accelerometers returns. The "Min" section shows the minimum reading that each accelerometer has taken, and the "Max" section shows the maximum reading. The "Avg" section is simply an average of every acceleration reading that has been taken since the app was launched or the clear avg button was pressed.
Question: Why is the orientation sometimes "Not Sure"?
Answer: If you hold the device at angle where it could really go either way, the device cannot say with certainty that it is a certain orientation.
Question: Why does the altitude value have no decimal fraction?
Answer: Beats me, but that is what the sensor reading is.
Question: Does my location get sent to you?
Answer: Absolutely not. Your location is only used within Sensor Data and is never sent to the developer.