May 22, 2017 This class allows you to easily port to B4i a B4A app that uses the B4A PhoneSensors object with types TYPE_ACCELEROMETER, TYPE_MAGNETIC_FIELD and TYPE_GYROSCOPE. "Out of the box" the Motion object of the iPhone library supplies: Uncalibrated magnetometer (GetMagnetometer) - this is not the same as the B4A TYPE_MAGNETIC_FIELD which is calibrated (i.e. corrected for device bias) - these calibration corrections can be large. User acceleration (GetUserAcceleration) - this is not the same as B4A TYPE_ACCELEROMETER which is user acceleration + gravity. This class corrects these deficiencies and adds: Gyroscope. Calibrated magnetometer calibration accuracy - in this class this property can be 0 (unreliable/uncalibrated) , 1 (low), 2 (medium) or 3 (high). It is essential that this be 3 (high) before reliance is put on the calibrated magnetometer values. The class is supplied encapsulated in an example app which shows as follows: Line 1: current total acceleration readings along device X Y Z axes Line 2: max total acceleration Line 3: min total acceleration Line 4: current gyroscope readings about device X Y Z axes Line 5: calibrated magnetometer calibration accuracy (if not 3, wave device around in a figure 8 pattern while slowly turning through 360 deg) Line 6: current calibrated magnetometer readings along device X Y Z axes Line 7: current magnetometer total intensity (should remain fairly constant regardless of device orientation) References: Gravity comes from this post: https://www.b4x.com/android/forum/t...eration-with-motion-object.49305/#post-452290 from which I was able to work out how to get gyroscope. Calibrated magnetometer comes from this post: https://www.b4x.com/android/forum/threads/calibrated-magnetometer-data.79794/#post-505290 from which I was able to work out how to get calibrated magnetometer calibration accuracy. Attachments MotionAsPerB4A.zip MotionAsPerB4A.zip 6.7 KB · Views: 31 Last edited: May 22, 2017 Click to expand...
This class allows you to easily port to B4i a B4A app that uses the B4A PhoneSensors object with types TYPE_ACCELEROMETER, TYPE_MAGNETIC_FIELD and TYPE_GYROSCOPE. "Out of the box" the Motion object of the iPhone library supplies: Uncalibrated magnetometer (GetMagnetometer) - this is not the same as the B4A TYPE_MAGNETIC_FIELD which is calibrated (i.e. corrected for device bias) - these calibration corrections can be large. User acceleration (GetUserAcceleration) - this is not the same as B4A TYPE_ACCELEROMETER which is user acceleration + gravity. This class corrects these deficiencies and adds: Gyroscope. Calibrated magnetometer calibration accuracy - in this class this property can be 0 (unreliable/uncalibrated) , 1 (low), 2 (medium) or 3 (high). It is essential that this be 3 (high) before reliance is put on the calibrated magnetometer values. The class is supplied encapsulated in an example app which shows as follows: Line 1: current total acceleration readings along device X Y Z axes Line 2: max total acceleration Line 3: min total acceleration Line 4: current gyroscope readings about device X Y Z axes Line 5: calibrated magnetometer calibration accuracy (if not 3, wave device around in a figure 8 pattern while slowly turning through 360 deg) Line 6: current calibrated magnetometer readings along device X Y Z axes Line 7: current magnetometer total intensity (should remain fairly constant regardless of device orientation) References: Gravity comes from this post: https://www.b4x.com/android/forum/t...eration-with-motion-object.49305/#post-452290 from which I was able to work out how to get gyroscope. Calibrated magnetometer comes from this post: https://www.b4x.com/android/forum/threads/calibrated-magnetometer-data.79794/#post-505290 from which I was able to work out how to get calibrated magnetometer calibration accuracy.
