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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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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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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Jun 9, 2009
Reading the sensor API (http://developer.android.com/reference/android/ hardware/SensorManager.html) The section about ACCURACY speak about calibration:
"calibration with the environment is needed"
How do it calibrate?! Is this software calibration? Phone specific calibration??
I don't see any methods to calibrate.
Using the HTC Magic the compass often give me crazy values like if I was on the magnetic pole. I feel pretty scared and hide under a tinfoil hat just in case...
So any url, doc or explanation!
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Dec 26, 2009
I've noticed that I get a slightly different reading from the compass depending on how I hold the phone. If I hold it vertically, its different than when I hold it horizontal (ie parallel to a table or floor). Does anyone know the most accurate way to hold the phone for the compass?
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Mar 11, 2010
Which permission needs my application to get access to the location of the user on Android?
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Jun 28, 2010
Are there any 3rd party apps out there that rotate the screen 180 degrees? I can't seem to find any.Most times, I find it easier to use my Cliq if it is upside down (such as listening to music and charging.)
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Jul 22, 2010
Is there a way to include the small circular degrees symbol to a Text View? This would be for temperature readings, as in degrees Celsius or Fahrenheit. I'm finding this an awkward question to Google, and wondering if anyone has done this program apically before.
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Dec 12, 2009
I'm working on an application that will randomly point an arrow in a direction, and have that arrow maintain it's direction if the device is moved. All I want to do it get the magnetic field readings as degrees and I can do it from there. The problem I'm having is getting the magnetic field readings. I can't find any tutorials on it and the API demo on google's dev site uses deprecated code (figures, google's sample code is never n00b friendly).
At this point I've got this together but I don't know what I'm missing, all the examples I can find are using SensorListener which has onSensorChanged(int sensor, float[] values) but SensorEventListener does not support "float[] values"
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Oct 5, 2010
I would like to display some UI Elements on a android xml layout file. I try to make an application, where two players can sit at each end of the mobile device, and play against each other.
So need to show some Button 180 degrees rotateted.
Is this possible? I tried android:gravity, but this did not work.
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Jun 8, 2010
How to rotate control (checkbox) in 180 or 90 degrees ?
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Oct 26, 2010
I have a database with coordinates in Degrees Minutes Seconds format, is there any way to change them to decimal coordinates using Android built in function or is there any simpler way to show such coordinates in a mapview ?
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Jun 16, 2010
My eve was running at 56 degrees celsius in my house earlier today. Wtf? I found out with juice plotter.The phone was at idle and i picked up to send out a text and and it was really warm to the touch.I took out the battery for an hour or so. It's been back on for a few hours now and its at thirty six celsius.Any suggestions ?
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Nov 8, 2010
Please link me to any website from where I can see the 360 Degrees View of Samsung Vibrant?
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Aug 3, 2010
When I turn it upside down it stays the same?
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Jun 22, 2010
I thought this thing had an accelerometer in it? It only goes from portrait to landscape instead of 360 degrees depending on when you turn it like my Pre? When holding the phone in your right hand and it is connected to the charger and on the net the damn cord gets in the way. Am i missing something here? You have got to be kidding me if there is no way to change this?
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Apr 6, 2010
Cyanogen 5.0.5.6 with bekit 1ghz running at 40 degrees. Is this a bad combination? I'm constantly at 40 degrees. If not there, usually upper 30s. I'm hearing people are often in low 20s with their ROMs. What's the deal? I don't even play games that much, nor do I browse intense websites. Would you suggest a different kernel?
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Jun 2, 2013
My g-sensor is working but is shifted for 90 degrees. So when my tablet is in landscape, screen is in portrait and vice cersa.How to calibrate it? I am having JB 4.2.2.
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Jul 27, 2010
For some reason it shows 103 degrees no matter the time or location. The city changes and the low/high temps change but not the current temperature. Any else ran into this?
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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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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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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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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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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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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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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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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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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:
Sin(R)=Ax/Gxz
Cos(R)=Az/Gxz
Tan(R)=Ax/Az
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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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?
CODE:..............
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Oct 13, 2010
i dont have an android phone write now.But in my application i need to use accelerometer values..so i need an a simulator capable of it.
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