The first thing you need to do is decide on an algorithm. As far as I know there are roughly speaking three ways to detect steps using accelerometers that are described in the literature: Use the Pythagorean theorem to calculate the magnitude of the acceleration vector of each sample from the accelerometer. Low-pass filter the … Read more
This is most likely what you want: UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation]; You can then use system macros like: if (UIInterfaceOrientationIsPortrait(interfaceOrientation)) { } If you want the device orientation use: UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation]; This includes enumerations like UIDeviceOrientationFaceUp and UIDeviceOrientationFaceDown
The Android emulator doesn’t support it itself but OpenIntents’ SensorSimulator fills the void. Download and unpack the zip file, then start the standalone jar file: $ java -jar bin/sensorsimulator.jar Next, install SensorSimulatorSettings on the emulator using the adb tool which comes with the SDK: $ adb -s <emulator device> install bin/SensorSimulatorSettings.apk (run adb devices to find the … Read more
Actually, the accelerometer measures linear acceleration; but since force is equal to mass times acceleration, people can consider it as measuring force as well as long as it has a constant mass. Linear acceleration is the rate of change of linear velocity. A gyro on the other hand provides the angular rotational velocity measurement as … Read more
Thanks for asking this question! Battery is one of our top most concerns and we work hard to optimize Google Fit’s battery usage and provide a magical experience. Google Fit uses a mix of sensors(Accelerometer, Step counter, Significant Motion counter), Machine Learning and heuristics to get the data right. Our algorithm is pretty similar to … Read more
Basic calculus behind this problem is in the expression (and similar expressions for displacements in y and z) and basic geometry is the Pythagorean theorem So, once you have your accelerometer signals passed through a low-pass filter and binned in time with sampling interval dt, you can find the displacement in x as (pardon my … Read more
Basically, it is a problem with my phone. Other users have reported this also happens with their phones, from different brands but same Android version. Other persons have no problem at all – strongly indicating that this is not a problem with the stock version of android but from the implementations of each company for … Read more
Gyros and accelerometers are not enough. You get position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation by (Google Tech Talk) at 23:20. I highly recommend this video. As for indoor positioning, I have found these useful: RSSI-Based Indoor Localization and Tracking Using … Read more
You get position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation why (Google Tech Talk) at 23:20. I highly recommend this video. It is not the accelerometer noise that causes the problem but the gyro white noise, see subsection 6.2.3 Propagation of Errors. … Read more
There are currently three distinct events which may or may not be triggered when the client devices moves. Two of them are focused around orientation and the last on motion: ondeviceorientation is known to work on the desktop version of Chrome, and most Apple laptops seems to have the hardware required for this to work. … Read more