Android :: Example App That Uses Accelerometer Sensor?

Jan 23, 2009

Where can I find a simple example application that uses the Accelerometer Sensor?

I've seen the Open Intents applications, but I'd rather use the raw Android API, at least until I understand it a little better. I'm surprised at the lack of documentation.

Android :: Example app that uses Accelerometer Sensor?

Android :: Is Orientation Sensor A Physical Sensor Different From Accelerometer?

Oct 30, 2009

Or it's just some virtual sensor the uses the data provided by the accelerometer and the magnetic field sensor to calculate the orientation?

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Android :: Low Accuracy Of The Accelerometer Sensor?

Jul 9, 2009

We are writing an application that uses acceleration sensor data to plot phone's movement in 3D. We are finding gross inconsistencies in the actual data output by the sensor. Also, sampling rates vary greatly from 8 to 200 millis. (using System.currentTimeMillis())

Specifically, when we try to draw a circle with G1 flat on the table all the time (filtering out gravity accel 9.8), most of the time we would get a plot of phone's position that is not a circle at all. Lots of times, it would be close to a straight line. Sometimes, it would start drawing an arc, but would not close the circle shooting off in a random direction.

We tried to eliminate the time variable, by substituting a constant time sampling rate (10 millis) to calculate phones position, but the result was very close to what we had before (shapewise). Also, the acceleration in Z direction when the phone is displaced lying flat on a table (XY plane) varies too by +/- 2 units which is a lot.

I do not think it is an error in our code, as we have checked it many times. If there were an error indeed and the accelerometer worked properly, we would see a consistently wrong depiction of the phone's movement. Unfortunately, repeating the same movement (circle) would produce sometimes wildly differently shaped plots.

It all comes down to us wanting to know if that is indeed the case that the G1 accelerometer is very unreliable and inconsistent device when used for more or less precise measurements? Is there some documentation/facts paper that would tell us just how reliable accelerometer is?

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Android :: How To Stop Accelerometer Sensor Running In Background?

Feb 4, 2010

I have an app where the accelerometer runs in the background and continues to read values from the sensor even after the activity exits.

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Android :: Rotate Screen By Program Code But Not Accelerometer Sensor?

Sep 17, 2010

There are some shortcoming for system's rotate screen function:

1. It is too sensitive to result in many unwanted rotating actions.

2. Accelerometer consumed power greatly. I want disable it and control screen orientation by my own program. Is it possible?

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Android :: Sounds + Accelerometer - Weird Accelerometer Values - BUG?

Jun 9, 2009

I am developing a game. In which the user controls movement using the accelerometer. Sounds effects can also be enabled. However when laying the phone flat down and playing the game without the accelerometer gives nice 0,0,0 values. However when play WITH SOUNDS on, i get a buch of weird values: while the phone is NOT moving.

This is really a big bug that makes life hard for Game Developers. I tried to take an avarge of the last 5 values from the sensor.. but this is not enough.. The harder the sounds plays: the higher the weird sensor values. When using the headphones: almost no weird values. Seems that sounds interferes with the accelerometer sensor.

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Android :: No Light Sensor / Proximity Sensor Detected On Hero?

Feb 8, 2010

I have a HTC Hero here, and when I tried to get the list of available sensors on the device by calling ((SensorManager) getSystemService (Context.SENSOR_SERVICE)) .getSensorList(Sensor.TYPE_ALL); I get only the following sensors: D/SensorManager( 6302): found sensor: BMA150 3-axis Accelerometer, handle=0 D/SensorManager( 6302): found sensor: AK8973 3-axis Magnetic field sensor, handle=1 D/SensorManager( 6302): found sensor: AK8973 Orientation sensor, handle=2 D/SensorManager( 6302): found sensor: AK8973 Temperature sensor, handle=3 According to the specs, there should be a light and a proximity sensor on the Hero, and I've seen it in action (the automatic screen brightness adjustment) - so at least the ambient light sensor is definitely there. My question is then, why doesn't the getSensorList return for me the light and the proximity sensors?

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Android :: Difference Between Orientation Sensor / Magnetic Field Sensor

Nov 2, 2010

Does anyone know the difference between the orientation sensor and magnetic field sensor on Android?Since I've read that magnetometer is synonymous with digital compass I'm a little bit confused. What are they really?

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Android :: Add New Sensor Support In Sensor Framework

Nov 18, 2009

Can some one point towards any documentation/resources/ threads that can explain how a new sensor support can be added in android sensor framework?

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HTC Droid Eris :: My Home Sensor Is Not As Responsive As My Back Sensor

Feb 18, 2010

My home icon is way less responsive than the back icon which seems to be perfectly normal. Sometimes I have to "press" the home icon twice to get the "buzz" and have it move the screen. However the back icon works 99% of the time on the first press. IS there any adjustment I can make or should I bring the phone back. I have had it now for 2 weeks.

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Android :: Accelerometer For Gaming

Jul 10, 2009

I'm designing a game for Android and I would like to use the accelerometer for some aspects of control. Has anyone come across a tutorial or example for something like this?

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Android :: How Do I Readjust Accelerometer?

Jan 15, 2010

My accelerometer is not reading the angle of the phone right. When I play Teeter I have to keep the phone on a sharpe angle to keep the ball still, and I feel I have to rotate it extra to go into landscape mode. Now the question is... how do I readjust the accelerometer?

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Android :: How To Use Accelerometer Detection

May 20, 2010

I want to know how to calculate the accelerometer movement.When i place the mobile horizontally in idle state and similarly when i place the mobile in hands,So there accelerometer value change when it is place horizontally or while it is in hand vertically.How To Identify them,Any Sample Codes will be useful.

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Android :: Get A Single Accelerometer Value?

Aug 23, 2010

I'm working on adding a calibration feature to an accelerometer-driven game. For the calibration, I need a single value from the accelerometer. Should I register a listener, get the first value it gives me, and unregister it, or is there a better way to get just one value?

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Android :: Accelerometer Direction Of Shake?

Apr 8, 2010

I've been playing with the data given by the accelerometer,trying to work out how I can gauge a shake from front to back or side to side. This all seems straightforward enough.But I'd love to know the direction of the shake. So, if the user is shaking backwards and forwards, I want to know if the device is moving away from the user, or back towards him/her. I can't find any way of telling this.

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Android :: Building Speedometer Using Accelerometer

Oct 17, 2010

I'm tinkering around with trying to build a speedometer using only the accelerometer for use when I go snowboarding. I can read values from the accelerometer but I'm not sure how I would derive the velocity. I was thinking of taking the square root of (X^2 + Y^2 + Z^2) where X, Y, and Z are the values reported by the accelerometer in each axis but that only would only give me the amplitude of acceleration at any given instant. I could multiple that by the sampling frequency to get my instantaneous velocity but this approach fails when I'm moving at a constant speed.

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Android :: How To Get Accelerometer Frequency Output?

Feb 11, 2009

I wanted to get the frequency of accelerometer output. How many readings can I get per second? And to what precision do I get?

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Android :: Accelerometer Gravity Components

Jun 7, 2010

I know this question is definitely solved somewhere many times already, please enlighten me if you know of their existence,

Quick rundown:
I want to compute from a 3 axis accelerometer the gravity component on each of these 3 axes.
I have used 2 axes free body diagrams to work out the accelerometer's gravity component in the world X-Z, Y-Z and X-Y axes. But the solution seems slightly off, it's acceptable for extreme cases when only 1 accelerometer axis is exposed to gravity, but for a pitch and roll of both 45 degrees, the combined total magnitude is greater than gravity (obtained by Xa^2+Ya^2+Za^2=g^2; Xa, Ya and Za are accelerometer readings in its X, Y and Z axis).

More detail:
The device is a Nexus One, and have a magnetic field sensor for azimuth, pitch and roll in addition to the 3-axis accelerometer.In the world's axis (with Z in the same direction as gravity, and either X or Y points to the north pole, don't think this matters much?), I assumed my device has a pitch (P) on the Y-Z axis, and a roll (R) on the X-Z axis. With that I used simple trig to get:
There is another set for pitch, P.Now I defined gravity to have 3 components in the world's axis, a Gxz that is measurable only in the X-Z axis, a Gyz for Y-Z, and a Gxy for X-Y axis.Gxz^2+Gyz^2+Gxy^2=2*G^2 the 2G is because gravity is effectively included twice in this definition. Oh and the X-Y axis produce something more exotic I'll explain if required later.From these equations I obtained a formula for Az, and removed the tan operations because I don't know how to handle tan90 calculations (it's infinity?).So my question is, anyone know whether I did this right/wrong or able to point me to the right direction?

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Android :: Accelerometer False Detection

Oct 27, 2009

I have a code snippet to detect accelerometer movements. It works some times by properly detecting slight movements, but sometimes it detects movements when I kept my device idle too. Are there any problems with built-in accelerometer detection on Android?

I use an HTC G-1 device. My code snippet is below. How do I resolve it so I can detect small device movements but not detect anything when the device is idle?


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Android :: How Can I Simulate Accelerometer In Emulator?

Oct 13, 2010

i dont have an android phone write now.But in my application i need to use accelerometer i need an a simulator capable of it.

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Android :: Get Accelerometer Reading Every X Seconds?

Jul 23, 2010

To be able to do some accurate calculations that I want for my app, I need to be able to get an accelerometer reading every 100ms. I haven't found a way to do this on android, it seems like the only way to get accelerometer readings is to put a listener that can listen at different intervals. Basically, is there a way to get a reading at exact intervals?

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Android : Is It Possible To Use Accelerometer In A Background Service?

Sep 9, 2009

It seems trivial to use GPS in a background service, but how can you do the same with the accelerometer? Everything I've tried seems to require a context, but a background service doesn't have a context?

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Android :: Remap Accelerometer Coordinate System

May 30, 2010

the remapCoordinateSystem method remaps the axis for sensor readings, but I want to remap the coordinate system to any angle, for example: new coordinate system is say relative to earth's coordinate system, 20 degrees clockwise to earth's X axis, and 10 degrees to earth's Y axis, while Z is derived from X and Y axis.

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Android :: Screen Lock Turns Of Accelerometer

Apr 16, 2009

Currently it seems that locking the screen automatically turns off the accelerometer. I looked around for quite a while and didnt find any solution for that. Is that intentional? It would be really helpful to know if this is how it is or if I just didnt find the solution for that so far.thank you for any help on that (and as I said, even "doesnt work right now/on purpose/.

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Android :: Accelerometer Not Working When Screen Turns Off

Apr 13, 2010

As I understand it, there seems to have been a change in the OS that prevents the accelerometer from running when the screen turns off and the phone CPU goes into its power saving state.Can this be confirmed?I have gotten around this by using a wake lock, but this is a much less than ideal solution as it drains a lot of battery.If the accelerometer was disabled in low power mode to save the battery, it may very well have the opposite effect in many cases, such as mine.A partial wake lock seems to be required to keep it running, which is obviously much worse than if just the accelerometer were running without the need for the wake lock.Are there any other workarounds anyone knows of to getting accelerometer values while the phone is in low power mode?Also, are there any plans to change this in future versions of the OS?If there are no plans to change this, I would definitely like to petition for this to be changed.

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Android :: Removing G Factor From Accelerometer Readings?

Jul 31, 2010

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 had used some but didn't work.

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Android :: Map Accelerometer Values To Screen Coordinates?

Jun 8, 2009

I am developing a small application for learning purpose which will move image when accelerometer readings change. I want a mapping of accelerometer values to screen coordinates. I am using trial and error method rite now. But it seems that it will not help. Is there any algorithm??

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Android :: Using Accelerometer To Calculate Distance - Eleveation

Jun 28, 2010

Can it be determined that where a person is i.e is he walking ? is he in elevator ? or is he climbing up the stairs ? using android's accelerometer or is there any other way to calculate such in android ?

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Android :: Converting Accelerometer Readings To Degrees

Apr 20, 2009

Does anyone know how to convert the accelerometer readings from g's to degrees?For example, if I want to use the x-axis readings and measure the tilt of the phone, flat would be 0g = 0 degrees and a 90 degree tilt to the right would be 1g (9.80665 m/sec^2).I can't come up with a formula for say 20 degrees or 45 degrees. Any help would be greatly appreciated.

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Android :: Varied Accelerometer Sample Rate

Jul 9, 2009

Has anyone been able to get the accelerometer on the G1 to sample consistently for long periods of time? We been doing some testing of the G1 accelerometer on Android, and wanted to see if others have gotten the same result.Our test uses a partial wake lock to keep the CPU alive.It stores the xyz values and time to local storage and then writes them to a file on the SD card once a second.The code below produces a csv file.The xyz values we're getting are within the expected range, but the sample rate of the accelerometer varies greatly.To determine that using the file produced, for each sample, we found the difference between the samples timestamp (taken from the SensorEvent) and the timestamp from the previous sample.The test results showed the time between samples ranging from 30 milliseconds up to 4.6 second spikes.We're interested to know if other people are seeing similar behavior from their phones.If you have the time and means.

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