I'm new to android development and I'm implementing a simple localization method to get used to the device. I've been reading some articles and I can't seem to figure out how the phone figures out sensor accuracy. My guess is that it decides this based on how long its been since it was last calibrated.
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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?
So a while back techcrunch produced a comparison of 4 different touchscreen accuracy.
The article is here: iPhone Beats Droid, Nexus One And Droid Eris In Touchscreen Performance (I'm not saying their results are correct or incorrect)
It seems to be an easy and accurate testing method of the touchscreen sensors' accuracy.
What I want:Please read that previous article in its entirety so you understand it. Reproduce the test using the Incredible. Post pictures of your results. Include any relevant info about your testing methods, the app you used, amount of practice you did before producing the results in the pictures you post, any strange results during the course of your testing, etc.
BONUS POINTS: include your other phones like the Droid, iPhone, Eris, Nexus One, etc. (ie. newer phones)
If you have an issue with the testing methods being proposed please explain IN-DEPTH what you take issue with AND WHY. If you are going to reference other threads PLEASE PROVIDE THE LINK.
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?
View 8 Replies View RelatedDoes 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?
View 1 Replies View RelatedMy 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.
View 9 Replies View RelatedOr it's just some virtual sensor the uses the data provided by the accelerometer and the magnetic field sensor to calculate the orientation?
View 7 Replies View RelatedCan some one point towards any documentation/resources/ threads that can explain how a new sensor support can be added in android sensor framework?
View 2 Replies View RelatedWas browsing eBay for some Android figures and I came across this site. They have what looks to be a model kit with our good friend Andy. I've considered buying, but I figured I'd ask around here to see if anyone had one and what they are like.
View 1 Replies View RelatedMy wife and i both have the EVO and for some reason she is always hanging up on people. is there any way to turn off the sensor so that when the phone is takin away from your face it doesnt light up the end call button?
View 4 Replies View RelatedI 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?
View 1 Replies View RelatedI'm interested in developing some software for the android OS using acceleration sensor and I would like to know how precise this technology is in mobile phones ? so I wont be waiting my time.If anyone know something please share!
View 3 Replies View RelatedI was dunking around with settings and got to the g-sensor level. I clicked calibrate, everything seemed fine. Now the phone won't go into landscape mode unless I shake it hard a few times. How the hell do I fix this?
View 9 Replies View RelatedWhich permission needs my application to get access to the location of the user on Android?
View 1 Replies View RelatedIs anyone having this issue? Friend of mine has the D2. Says the display does not turn off when next to her face and registers any touches.I don't have a D2, so I don't know what the phone options/settings might be.
View 3 Replies View RelatedJust wondering what people think of the accuracy of the screen. Coming from a WM phone and a resistive touch screen, I find it a lot harder to hit small places on the EVO. Little check boxes are hard to get. Also, I just feel like it doesn't always hit where I think it should.....
What are others thoughts on this? I have read in the past that resistive screens are more accurate but really just blew it off as people who were just defending their WM phone's but that statement really does seem to be true....
Still love the thing though and it finally feels like I got a totally new device! My last 4 WM phones just felt like the same thing over and over again with a little enhancement on each one....
I have been using my N1 for a few days now and the GPS accuracy is really wrong, about 500m out of the right position. I know GPS is not really precise, but 500m is far too much.
I am seeing this behaviour when on WI-FI, haven't test through 3G/edge yet though.
I haven't installed any ROM.
How much accurate are the coordinates received by the GPS antenna in the reality?I'm using the emulator but it doesn't work well with coordinates too much close is there nobody that have tested an application based on the package "Location" in a real device(I don't have a real one yet..) and knows how to answer me?
View 7 Replies View RelatedWith my location listener i get accuracy values about 30-100 m (being on an open field without annoying houses around me disturbing the gps signal). Why is that so bad? I thought you could get an accuracy about 3m with gps. And the Google maps applet for example has a much better accuracy. How can i improve the accuracy? I'm using the default gps provider. I saw you can create a Criteria object to get the best provider, but there are only the gps and the mobile phone net providers anyway - so it's some kind of senseless to get the location provider that way. is there no way to define the needed accuracy?
View 6 Replies View RelatedI made a quick video to demonstrate the vast difference in reported 4G speed between the Android speedtest.net app and the browser version of the speakeasy test. My results show great differences btw the two (2-3 Mbps). I don't know which one is correct; but I think the Speedtest app cannot correctly determine WiMax and WiFi speeds. In addition to what the video shows, when the EVO is connected to home Wifi the greatest speed Ive seen is 11 Mbps (even though the app dial stops at 10) when a laptop test done at the same time correctly shows 15+. Is anyone else seeing similar? I just think its flawed that many are using the app as the standard for network speeds on mobile devices.
View 21 Replies View RelatedMy app has an issue where many players get bounced all over kingdom come when using GPS to get a signal. I had this issue with my G1 on occasion but not on my Nexus One. I am talking hundreds of miles from their real location. I changed the code to throw out anything that was not at least 500 meters accurate. My question is, if the location placement is hundreds of miles off, how reliable will the accuracy reporting be? Does it realize that it could be hundreds of miles off?
I am asking the community because I cannot reproduce the scenario with what I currently have so I can't test if my fix is meaningful. Does GPS know when its readings are that far off?
wanted to know that the accuracy value returned by the getAccuracy() is of which type radial accuracy or horizontal accuracy.
View 8 Replies View RelatedIf I do Location.getAccuracy() I get a number of meters. Is that number a radius or a diameter? I thought it would be a radius, but Google's MyLocationOverlay uses that value as a diameter.
View 4 Replies View RelatedI'm writing a mapping application. In simple terms, it sends some info about the user's current location to a server when the user clicks on a button. I need the location to be absolutely correct, and when I first started to implement LocationListener, I found that it often wasn't. So I've used location.getAccuracy() to check the GPS accuracy, and warn the user - without submitting the data - if the location isn't accurate enough. Code...
View 3 Replies View RelatedYour "best" (lowest value) GPS Accuracy you have seen on your Captivate. This is to compile data to send to Samsung's technical support, hopefully to aid in trouble-shooting the issue. After voting in the poll, please post indicating which firmware you are running (pre or post update, or which custom ROM or leak). This poll is not concerned with time to lock, holding a lock, or any other GPS issue than accuracy, and is just to compile a data set to test one part of a hypothesis of mine. It seems my Captivate has a "best" (lowest) accuracy of ~16.2 ft (5m), much higher than say, an N1 or G1 (which max out around 6.6 ft).
If you are unsure how to check for accuracy to get a specific number, use either GPS Test or GPS Status (free, in the market) as they both will display accuracy of the lock in real-time. GEnerally the accuracy improves with the longer the lock holds, so for maximum effectiveness, let's set the official accuracy time at 5 minutes (leave the app open for 5 minutes, then record the accuracy) or the best value you have noticed. Also, if your value is not exactly one that is up here, please select the closest number to your value...
Im working on an app that use gps My testing devices are Nexus One and Htc Mytouch 3g Slide
So does anyone know how to improve the gps accuracy?
I am developing a website which used W3C GeoLocation API to obtain users' position. I try to run the website in Android Emulator and use DDMS / geo fix to send the coordinate to the device. However the coordinate received is inaccurate.
For example, (22.377127, 114.095535) will become (22.370335, 114.08523353). I try to run some Android GPS example from Internet, and the results is just the same. I can certainly say that this is not my program bug. From my observation, it seems like some rounding problem.
I'm having a weird problem with GPS accuracy. Basically, I check the GPS accuracy in a background thread after the user clicks a report button, and show the accuracy in a progress dialog, changing second by second. (Code is below.) The following strange thing happens:
1. If the user clicks more or less immediately on the button after taking the phone out, accuracy is unsurprisingly pretty poor to start off with, say more than 100m. But the accuracy never really improves very much while the user is running the background thread. There is some improvement, but it's slow and it never gets very accurate. 2. However, if the user gets the phone out and then waits for several seconds *without* clicking on the button and running the background thread, and *then* clicks on the button, the accuracy quickly improves and becomes very good. When they click on the button, the accuracy shows up as fine - within the same length of time............
I am curious about the accuracy of the motorola droid GPS, before installing a golf app. Can these units pinpoint to within a few yards or is the area fairly wide.
View 4 Replies View RelatedI had a question come up here at the office about the accuracy of the GPS on my EVO. I loaded the "GPS Status" app and went outside and found that I am getting 3 Meter accuracy which is as good as my Magellan GPS that I use while hiking. My question is this, while using Google maps I believe that location can also be derived via signal strength triangulation from cell towers. If this is so has anyone seen a position accuracy that is derived from both the GPS and the Towers.
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