accelerometer - w3toppers.com

Acceleration from device’s coordinate system into absolute coordinate system

I finally managed to solve it! So to get acceleration vector in Earth’s coordinate system you need to: get rotation matrix (float[16] so it could be used later by android.opengl.Matrix class) from SensorManager.getRotationMatrix() (using SENSOR.TYPE_GRAVITY and SENSOR.TYPE_MAGNETIC_FIELD sensors values as parameters), use android.opengl.Matrix.invertM() on the rotation matrix to invert it (not transpose!), use Sensor.TYPE_LINEAR_ACCELERATION sensor … Read more

How to determine the direction of a iPhone shake

I developed a solution which gives me better feedback than the proposed solution (only for left and right shake). The way I did it here is quite sensitive (recognizes a small shake), but sensitivity can be adapted by changing tresholdFirstMove and tresholdBackMove (increase for lower sensitivity) In Swift : (in your viewController. And add “import … Read more

Accelerometer Low Pass Filtering

accelX = (acceleration.x * kFilteringFactor) + (accelX * (1.0 – kFilteringFactor)); Whats happening in this code you are multiplying the acceleration at the moment by the Filtering factor 0.1 and then adding it to the filtered acceleration of the last time an update was called by 0.9. This is pretty much getting the new value … Read more

Is there a way to retrieve multiple sensor data in Android

Can you try something like this: private SensorManager mSensorManager; private SensorEventListener mSensorListener; //// mSensorManager = (SensorManager) this .getSystemService(Context.SENSOR_SERVICE); mSensorListener = new SensorEventListener() { @Override public void onAccuracyChanged(Sensor arg0, int arg1) { } @Override public void onSensorChanged(SensorEvent event) { Sensor sensor = event.sensor; if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) { //TODO: get values }else if (sensor.getType() == Sensor.TYPE_ORIENTATION) … Read more

Transforming accelerometer’s data from device’s coordinates to real world coordinates

Oki, I have worked this out mathematically myself so please bear with me. If you want to translate an acceleration vector accelerationvalues into an acceleration vector trueacceleration expressed in real world’s coordinates, once you have azimuth,pitch and roll stored in a orientationvalues vector, just do the following: trueacceleration[0] =(float) (accelerometervalues[0]*(Math.cos(orientationvalues[2])*Math.cos(orientationvalues[0])+Math.sin(orientationvalues[2])*Math.sin(orientationvalues[1])*Math.sin(orientationvalues[0])) + accelerometervalues[1]*(Math.cos(orientationvalues[1])*Math.sin(orientationvalues[0])) + accelerometervalues[2]*(-Math.sin(orientationvalues[2])*Math.cos(orientationvalues[0])+Math.cos(orientationvalues[2])*Math.sin(orientationvalues[1])*Math.sin(orientationvalues[0]))); trueacceleration[1] … Read more

Using accelerometer, gyroscope and compass to calculate device’s movement in 3D world

The accelerometer gives you three directions (x, y, z). They are acceleration measurements which is harder to know what the position of the device is. But, remember acceleration is related to position through integration: a(t) = a[x] v(t) = a[x]t + c x(t) = a[x]t ^ 2 + ct + d Problem is you can’t … Read more

calculating distances using accelerometer

The short answer to your question is you can’t do it. The double integration method is really the only way to get the information you are looking for using only an accelerometer. You found the problem with this method. The error increases over time and generally doesn’t give the accuracy many are looking for. Kalman … Read more

Why is accelerometer:didAccelerate: deprecated in IOS5?

I did not yet use iOS 5, but already in 4.x UIAccelerometer and UIAccelerometerDelegate were replaced by the CoreMotion framework. It is more sophisticated, takes gyroscope signals into account and performs a sensor fusion i.e. does calibrating stuff like bias calculation for you. Basically the CMDeviceMotionHandler block callback is now the equivalent. It is called … Read more

Get frequency with highest amplitude from FFT

I suggest you step away from your code and first master ability to perform a fft call and make sense of the result returned from that call … either read in a sin curve of known freq or just write a function to populate an array with a floating point sin curve ( this is … Read more

Moving an image using Accelerometer of android

Use this code. You were never setting the location of the drawable after you intialized that class. You’ll have to do some calculations to set the balls location properly. The way you were doing it was getting values over 10000 which was drawing the oval off screen. import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; … Read more