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?

Android :: Is Orientation Sensor a Physical Sensor Different from Accelerometer?


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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 :: 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.

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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 :: 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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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 :: 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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Android :: Using Orientation Sensor To Get 360 Orientation

Jul 17, 2009

I have a problem with working with the ORIENTATION values of the SensorManager. I would like to have some kind of 360-value which directly shows me if the phone is in normal portrait (0), landscape, portrait turned around (180) or anything in between. So I could have, for example, an arrow that points to the floor (like gravity would do with a plummet) all the time, no matter how I tilt (sidewards) the phone. I thought this would be easy, but I'm pretty confused at the moment.

First of all, the X value of the orientation-array seems to correspondent with how I turn the phone, BUT: if it's completely uprightly standing, this value is about 60 ... why not 0 (or 90, 180, 270), as I would expect?

Second: The value resets if I turn the phone and Android automatically changes screen orientation. So both in Portrait and in Landscape mode it will be sth. like 60 when the phone is in a 0 angel in real world. I set "android:screenOrientation" to "landscape" but this doesn't help anything :/

I want the app NOT to change orientation when I turn the phone, but I want it to get a continuous orientation value when I tilt the phone.

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Android :: Portrait Vs Landscape Orientation Using Sensor

Dec 18, 2009

I'm trying to detect landscape vs portrait orientation with the following:

public void onSensorChanged(SensorEvent event) { float pitch = event.values[2];
if (pitch <= 45 && pitch >= -45) { // portrait }
else if (pitch < -45) { // landscape }
else if (pitch > 45) { // landscape } }

Anyone have something more robust? It works pretty well, except if the phone is in a landscape orientation and the user starts to 'flatten' it out, starts thinking it's in the portrait orientation again.

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Android :: Enhanced Sensor API

Jun 2, 2009

I had a discussion with a few of the Android team member at Google IO, and I'd like to throw the idea out here for general brainstorming with the community. My view is that it is not a good approach to create "sensor-specific" APIs with iterative releases of the Android platform and SDK's. By this, I mean that instead of adding a "location API", and an "accelerometer API", and whatever comes next, we should create a "generic" sensor API that can work with a broad range of sensor types, including sensor configuration, demand read/write/configuration, event notifications, and other functions. In this way, 3rd parties could also add innovative sensing capabilities (or external sensors) to their Android devices which would be "instantly" supported by the platform. Well-known sensor such as collocation and acceleration could have agreed-to sensor names/namespaces, with full extensibility for additional sensor types. As an example, collocation as a 2D longitude/latitude is fine for some apps, but for "inside the building" applications or for other apps involving the need to accurate location of people or resources in 3 dimensions, it doesn't cut it. Additionally, one can easily envision inclusion of RFID, environmental, and other sensors in devices that could dramatically enhance the capabilities of Android applications.

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Android :: How Can I Find My GPS Location With GPS Sensor?

Aug 20, 2009

I am currently working with a HTC G1 and I am trying to retrieve my GPS position. But I can not understand very well the documentation. I wrote those lines, but they didn't work.It already write "provider == null" so I guess that "mgr.getBestProvider(new Criteria(), true);" returns null.

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Android :: Video Motion Sensor App?

Sep 9, 2010

I just got an android, and I love it. But I was wondering if there is an app where it records video, but it automatically starts recording when there is motion, and stops when the motion goes away. I believe its possible, just wondering if is been done.

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Android :: How Do I Get Sensor Data On Mapoverlay?

Sep 14, 2010

since map overlay is not activity, how do i get the sensor data so that i can draw on the map overlay? like the direction arrow.

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Android :: Bad Compass And Sensor Data

Jul 22, 2009

Am researching a problem with compass and sensor values returned by the phone. I found this thread: http://groups.google.com/group/android-developers/browse_thread/threa. Which seems related, but it's old so I'm starting a new one. I'm getting stuck values from both the compass and orientation sensors. It was fine yesterday, but today, I'm only getting values in a limited range (e.g. compass headings from 240 - 290), no matter how I orient the device. What's even more odd is that the radians returned from the call to Sensor Manager.get Orientation(), which returns radians, is giving consistently out of range values. Anyone see this same behavior, and if so, any fixes? Here's some sample sensor data. Format is heading, pitch, roll. The first set contains raw values, the second set contains values after I've applied the orientation matrix generated by the Sensor Manager. The third set contains values after I've smoothed the data with my own algorithm.

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Android :: Sensor Not Being Notified When In Standby

May 28, 2009

I am listening events from accelerometer sensor and everything is going right. The problem occurs when phone gets in standby mode and I am not being notified by sensors anymore. Does Anyone know if it's possible to get sensor notifications, by implementing a listener, even if phone is in standby?

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Android :: Light Sensor On The Nexus One

May 20, 2010

I'm having some troubles with the light sensor on the Nexus One.

AFAIK, the proper way to read the measures of a sensor is registering a SensorListener through the SensorManager and then wait for the readings on the onSensorChanged method.

My main problem is that the light sensor don't seem very accurate (the readings jump a lot) and I don't get the first reading until the lighting conditions change. I have to change the phone orientation, go outdoors or hide the sensor with my fingers or otherwise I don't receive any value. Is there any way to increase the accuracy or, even more important, to force an initial reading?

BTW, I have tried with SensorManager.SENSOR_DELAY_FASTEST but I haven't noticed any change.

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Android :: Get Current Sensor State?

Feb 7, 2010

Yes, I can get sensor update events with SensorEventListener. But this approach has 2 drwwbacks:

1) For some sensors I have to wait for the state to update. For example, temperature may update after a minute!

2) In some cases I can get incorrect readings. For example, the phone lies on a flat surface and does not move. I receive first orientation update event after listener registration. When only a part of the orientation vector changes, other parts may be 0. And it is no way to determine, is it a true 0 degree azimuth or just an incomplete vector. If I move the phone a little, the correct non-zero azimuth appears.

To solve this problems it's possible to create a separate thread that constantly monitors sensors. After some time it will certainly contain true values. But I think that it is an overhead for such simple task.

Is it any other way to get current sensor data?

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Android :: How To Use Information From Sensor For Augmented Reality?

Jun 21, 2009

Could somebody (Mathias Agopian alias pixelflinger perhaps) please tell me how to use information from sensor for augmented reality stuff. Sorry am not much into graphics stuff but I did try my part to figure stuff out with help of documentation. Didn't miss the note: ""Note: It is preferable to use getRotationMatrix() in conjunction with remapCoordinateSystem() and getOrientation() to compute these values; while it may be more expensive, it is usually more accurate. Tried both. With the above method roll is always negative (in radians) of the roll returned by orientation sensor event. Not the real problem though as these are in the same +/-90 range but negative/opposite. One of these goes against the definition of roll in android documentation. I have the camera on landscape mode and did try with and without the suggestion: ""# Using the camera (Y axis along the camera's axis) for an augmented reality application where the rotation angles are needed : remapCoordinateSystem(inR, AXIS_X, AXIS_Z, outR); Yet no luck. Got a few lessons on quaternions etc. But am sure it is much easier than the mess am getting into. Say, orientation sensor event returns yaw, pitch & roll in say eO[] What are the next steps to get rotation matrix that I could use in opengl to rotate a augmented scene overlapping the camera preview?

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Android :: Getting Sensor Information From Native Code - C Or C++

Oct 12, 2010

Is this possible to access a sensor data form native code without using Java at all? I need to access to the sensor as fast as possible, but it seems like the "DELAY_FASTEST" parameter when registering an event change is not fast enough.

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Android :: Disable Light Sensor During Call

Nov 24, 2010

When you talk on the phone in Android the light sensor is working. If you cover the top left corner of the screen, the display turns black and you can't see anything. I would like to cancel that feature and I tried working with Android Sensors and the Light Sensor but it is not working. This is my code:

senMgrLight=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
senMgrLight.registerListener(onSensorListener,
senMgrLight.getDefaultSensor(Sensor.TYPE_LIGHT),
SensorManager.SENSOR_DELAY_FASTEST);

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Android :: Sensor Listeners - Threads And Responsiveness

Jun 24, 2010

I have two questions about sensor listeners

1. from which thread are sensor values updated and should this be synchronized? can sensor's listener callback be a good place to call custom's view onDraw method? as this should be done from different thread. I cant find anything about it. In another words my problem is that I want to listen to sensors change and draw something on view surface but I dont know which thread (the main thread of the application?) is updating sensor's state

2. If I register sensor listener with SENSOR_DELAY_FASTEST my application is not responsive at all! Raw application with TextView only is not reacting to go back or home button! How should I deal with this or am I doing something wrong?

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Android :: Sensor Manager API Measures Steps?

May 26, 2010

Is it the SensorManager API that i have to use to measure steps? Any sample code or tutorial?

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Android :: Is It Possible To Get Sensor Data At Regular Intervals?

Aug 2, 2010

Just joined the Android group. I'm having problems with the acceleration and orientation sensors.I would like to obtain sensor data (acceleration and orientation values) at regular intervals (10 milliseconds). However, the SensorEventListener doesn't allow you to do that. Does anyone have an idea of how to work around this issue? This is important as I need it to collect data for an app I'm working on.

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Android :: Sensor Data Poll Mechanism

Jun 3, 2010

Per the current implementation in Sensor Manager, the SensorThread is polling data per below code, final int sensor = sensors_data_poll(values, status, timestamp); it then checks the sensor type if it is registered and processes the data further. For an application which has registered for only one sensor, still to get that particular sensor data, SensorThread has to execute for atleast N-1 loop most of the time. Can anybody provide the insight as to, why SensorThread is waiting to check the sensor type to be returned by the HAL instead of sending sensor information which is currently registered by that application. Wouldn't that increase the performance?

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Android :: Latency When Getting Sensor Data From Phone?

Mar 9, 2010

I am working on a project using HTC magic which requires the data from the electronic compass, including both the accelerometer and magnetic sensor. But I find that there is a significant latency between the move of the phone and the trigger of the sensorChanged event. In other word, the acceleration and magnetic data obtained from sensor are updated about half of a second after my motion. And I have several questions about the problem as follow. Are the orientation data computed by the acceleration and magnetic data? Or are there a physical sensor for orientation? Does the latency result from the android API (using the event) or the physical limitation of the electronic compass? It is said that the model of the electronic compass is AK8976A from Asahi Kasei. Does anybody have the datasheet or know the frequency of the sampling? Any idea to improve the real-time experience?

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Android :: Want To Add My Sensor / To Reduce Develop My Application

Jul 9, 2009

I know the Android SDK provides many Sensor class to use to get data or do something. I already verified my driver of sensor to get data successfully under linux kernel-2.6.29 I use I2C protocol to communication with my device, so I put sensor code under drivers/i2c/chips NOW I want to add my sensor into Android and I hope to link Android Sensor class with my device to reduce develop my application. How to do for this goal? Could I need to modify application framework or Libraries or another driver type for new device? I big your help

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Android :: How To Turn On / Off Screen Using Proximity Sensor?

Sep 21, 2009

I have an application that needs to turn on/off the screen using the proximity sensor like what most dialer applications do when a user is making a phone call. I cannot seem to find a way to turn on/off the screen at will.

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Android :: Light Sensor Value And Battery Level

Feb 15, 2010

I am writing a program and I am able to get the light sensor value and current battery level, but only the light value changes and when the battery level changes. Is there a way to get these two values anytime? Like when a user runs my program, I would like to grab the current values right away instead of having to wait for them to change.

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