accelerometer

I need to calculate Speed with which the user is moving . So we need two things to calculate speed which are GPS and Accelerometer . But both have their limitations. 1) GPS is not available all the time.While I getting the current location of user always I am getting from Network provider only and not from GPS . 2) Accelerometer is not accurate. So which approach should I go with? Shishir Shetty An implementation, based on the GPS, is available at this link Ali The most accurate results can be obtained by using both of them , through sensor fusion. See my previous answer to question Using

Can anyone help on removing the g factor from accelerometer readings? I am using SensorEventListener with onSensorChanged() method for getting Sensor.TYPE_ACCELEROMETER data. I need only pure acceleration values in all directions. So at any state if the device is stable (or in constant speed), it should give (0.0,0.0,0.0) roughly. Currently, depending on its pitch and roll, it gives me variable output depending on the g forces acting on each axis. I hope there is some formula to remove this, as I also get orientation values (pitch and roll) from Sensor.TYPE_ORIENTATION listener. I have used

I've searched for a tutorial/an answer on polling accelerometer faster with NDK but didnt find solver yet. just found an androiddevelopers documentation here . what i need is polling acceleration about 100 samples per second (100Hz), by default my device (Samsung Galaxy SL i9003 with gingerbread 2.3.5) with default SENSOR_DELAY_FASTEST can only get about 60 samples persecond (60Hz). Therefore i tried to access sensor via NativeActivity with NDK by generating .c files that i try to make based on sensor.h and looper.h: #include <jni.h> #include <string.h> #include <android/sensor.h> #include

The Google Fit app, when installed, measures the duration you are walking or running, and also the number of steps all the time . However, strangely, using it does not seem to drain the battery. Other apps like Moves which seems to record number of steps pretty accurately declares that it uses a lot of power because of it constantly monitoring the GPS and the accelerometer. I imagine several possibilities: Wakes up the phone every minute or so, then analyses the sensors for a few seconds and then sleeps again. However it seems that the records are pretty accurate to the minute, so the waking

I need some help using gyroscope on iPhone. I can't understand readings from CMAttitude regarding pitch, roll and yaw in a particular situation. This is my code - (void)handleDeviceMotion:(CMDeviceMotion*)motion { NSLog(@"Yaw %f ",attitude.yaw * 180 / M_PI); NSLog(@"Pitch %f ",attitude.pitch * 180 / M_PI); NSLog(@"Roll %f ",attitude.roll * 180 / M_PI); } Let's suppose that iPhone is laying down on a plane as in the following figure: pitch, roll and yaw are (almost) 0 degrees and any turn around an axis returns understandable readings. For example, turning the device right, the Yaw decreases

Now that iOS 4 is no longer NDA, I would like to know what Gyroscope has to offer over the Accelerometer for developers. Is there a difference in APIs? Other things? Yann Ramin A MEMs gyroscope is a rate of change device. As the device rotates in any its axis, you can see a change in rotation. An accelerometer only provides the force along the X,Y,and Z vectors, and cannot solve for "twist". By using both sensors, you can often implement what is referred to as a 6DOF (degrees of freedom) inertial system - or dead reckoning - allowing you to find the relative physical location of the device.