accelerometer

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I don't have an Android phone right now. But in my application I need to use the accelerometer values. How can I do this in a simulated environment? 回答1: 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

问题 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,

问题 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

问题 I am developing an Android app and I am need to detect user context (if walking or driving at minimal) I am using accelerometer and sum of all axes to detect the accleration vector. It is working pretty well in the way I can see some periodics values while walking. But I need to detect these poeriods programmatically. Please is there any kind of math function to detect period in set of values? I heard Fourier transformation is usable for that, but I really dont know how to implement it. It

问题 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

问题 I have to develop the same functionality as of this Pedometer App I have observed this Pedometer app in very high detail. It's not a perfect pedometer app. For example, if you stay/sit at one place and shake your hand, it also detects steps counts and distance. Ignore this ideal and gravity behavior, because in the instructions of this app it's already been mentioned that you should tie up your iPhone or you should place it in your pocket to count steps. This way, I have found this app

问题 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? 回答1: 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

问题 The Sensor Fusion video looks great, but there's no code: http://www.youtube.com/watch?v=C7JQ7Rpwn2k&feature=player_detailpage#t=1315s Here is my code which just uses accelerometer and compass. I also use a Kalman filter on the 3 orientation values, but that's too much code to show here. Ultimately, this works ok, but the result is either too jittery or too laggy depending on what I do with the results and how low I make the filtering factors. /** Just accelerometer and magnetic sensors */

问题 i want to know how to calculate steps taken using the Accelerometer. Actually i calculate acceleration and use this code to count step length = sqrt(x * x + y * y + z * z); if(length>=2){ stepcount+=1; } where length calculate acceleration using acceleration.x, acceleration.y,acceleration.z But my main problem at starting the application the stepcount gives correct step value but as time pass its value is not correct.Plz help me 回答1: Basically you're using sudden acceleration over a certain

问题 For my App I need to calculate the acceleration of my device in reference to true north. My idea was to calculate the device orientation to magnetic north and apply the declination to it to get the orientation to true north. Then I want to calculate the acceleration of the device and reference it to the orientation, but I do not know how I should do this. I would try to get the device orientation using SensorManager.getRotationMatrix() and SensorManager.getOrientation() . Then I get the