accelerometer

What is the difference between gravity and acceleration sensors in Android? From my point of view the physical value is the same in both cases. Which one measures the force acting on unit mass inside the device? ADDITION The question is: what physical quantity is measured by these sensors? According to equivalence principle the acceleration and gravity are indistinguishable and the only way to measure both is by usual (but 3d) spring balance. Acceleration sensor gives you back the sum of all forces applied to your device, while Gravity sensor returns only the influence of gravity. If you want

I am well aware of the existence of this question but mine will differ. I also know that there could be significant errors with this approach but I want to understand the configuration also theoretically. I have some basic questions which I find hard to answer for myself clearly. There is a lot of information about accelerometers and gyroscopes but I still haven't found an explanation "from first principles" of some basic properties. So I have a plate sensor that contains an accelerometer and gyroscope. There is also a magnetometer which I skip for now. The accelerometer gives information in

I am developing an application for Android where I need to remove gravity from accelerometer readings. I have read multiple discussions on this problem, I have also found an algorithm here , but I didn't really understand it. I want to filter gravity from each axis, not from the total acceleration. Could you please help me out? My code should be something like: public void onSensorChanged(SensorEvent sensorEvent) { float vals[] = sensorEvent.values; float accelerationX = filterGravity(vals[0]); float accelerationY = filterGravity(vals[1]); float accelerationZ = filterGravity(vals[2]); } What

In get rotation matrix value it contains public static boolean getRotationMatrix (float[] R, float[] I, float[] gravity, float[] geomagnetic) Here how can i calculate the float[] gravity ? I found a sample of code where it calculate the orientation using both Accelerometer and Magnetic field boolean success = SensorManager.getRotationMatrix( matrixR, matrixI, valuesAccelerometer, valuesMagneticField); if(success){ SensorManager.getOrientation(matrixR, matrixValues); double azimuth = Math.toDegrees(matrixValues[0]); double pitch = Math.toDegrees(matrixValues[1]); double roll = Math.toDegrees

From the accelerometer, is it possible to get the angle of elevation? For those of you who don't know, the angle of elevation is: Is this possible with the accelerometer measurements? It is not really possible to get that "elevation angle" to the line of sight since you have no idea where the user is... What you can do though is assume that the user orients the screen of the device straight towards his eyes. With that assumption, you can use http://developer.android.com/reference/android/hardware/SensorManager.html#getRotationMatrix(float[], float[], float[], float[]) to get the orientation of

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. I want to create an app that **starts the Main activity whenever the device shakes, even when screen locked. Can anyone explain how to do that? I have an idea that it requires to create a service that runs in background, but I am struggling with actual coding and don't know how to do it. To create an app which is sensitive to shake event: A. In manifest - register a boot receiver. It will make sure your app will always

I am implementing a demo TIMER, with Vibration ( at a particular condition ), When I press start my timer starts running.. and when I stop it using stop button, it simply stops. Now I have to integrate a functionality, when the person shifts the device (while the Timer is running) , it should reset the timer. It is working pretty good, but the accelerometer functionality is not working absolutely accurate. It needs a fast jerk to reset the timer. Suggest me a good solution for the same. Here is my code public class SensorAccelerometer implements SensorEventListener { private Context context;

I have two time series of 3D accelerometer data that have different time bases (clocks started at different times, with some very slight creep during the sampling time), as well as containing many gaps of different size (due to delays associated with writing to separate flash devices). The accelerometers I'm using are the inexpensive GCDC X250-2 . I'm running the accelerometers at their highest gain, so the data has a significant noise floor. The time series each have about 2 million data points (over an hour at 512 samples/sec), and contain about 500 events of interest, where a typical event