Accelerometer rate (bug in GT540?)

[Guest gspeed]

Hi - I came across an issue on my GT540 accelerometer sensor: it's rate - number of times per second you can get the sensor values- seems to be stuck to about 10Hz, i.e. each ~100ms or, said in other words just 10 values are gathered per second. :)

This is bad, since to play smoothly some games or to leverage on some applications -like speedometer, pedometers etc- an higher rate is needed, at least 40Hz.

FYI - the google android1.6 compatibility specs said accelerometer should be able to report at a frequency of 50Hz.

So... I'm wandering if it is just my phone that is buggy and I would really appreciate if anyone could verify on his GT540.

Example instruction:

1. install the free AccelerometerValues app from market

2. click Settings:

set Log interval (ms) to 50 or 10ms

flag "log values to file" and "file format cvs"

3. start the log for 2-3 secs

4. using Astro go to /sdcard/accelerometervalues and open the log file

you should see something like:

Time;X;Y;Z

80;1.253072;1.0215261;9.602345

173;0.9942854;0.7627395;10.528529

275;1.0623871;0.8036005;10.56939

378;0.9942854;0.8308412;10.147159

480;1.1032481;0.6810174;10.378705

583;1.0623871;0.6810174;10.56939

685;1.0215261;0.7218784;10.378705

788;1.0623871;0.7218784;10.2152605

941;1.0623871;0.6810174;10.446807

...

[/codebox]

The time is in ms (milli-seconds) and as you can see I got a row every ~100ms

THANKS!

PS: for programmers, it seems the SENSOR_DELAY_GAME or FASTEST or UI etc gets ignored and it always report data using a rate suitable fore SENSOR_DELAY_UI

[Guest gspeed]

Anyone willing to help? :)

Test takes just 5mins... I'd like to know if I should return my new android phone or not - I bought it 3 days ago.

Software version is "vanilla": GT540-V10b-AUG-11-2010

Not sure if an update would help...

[Guest agaith]

Here are some values

Time;X;Y;Z

614;0.14982383;7.3822284;5.706926

706;0.44947147;7.2324047;6.0882955

808;0.7218784;7.1506824;5.3936577

911;1.9477097;6.932757;5.7750273

1013;2.4108016;6.9599977;5.8567495

1116;2.4108016;7.082581;6.3198414

1220;1.334794;6.810174;5.9248514

1322;-0.6810174;7.3822284;5.9248514

1424;-1.1441092;7.84532;5.5162406

1527;-0.06810174;7.504812;5.7341666

1629;1.6344417;7.000859;5.5434813

1734;2.4516625;7.3822284;5.7750273

1835;1.1032481;6.9599977;6.0474343

1938;-0.8036005;7.3141265;5.9248514

2040;-1.56634;7.84532;5.012288

2143;1.3756552;6.537767;6.66035

2247;2.9419951;6.932757;6.428804

2348;-0.3405087;6.578628;5.1212506

2451;-0.61291564;7.9679036;6.0882955

2553;3.255263;6.347082;6.2789803

2657;1.3756552;6.006573;5.5434813

2758;-2.7104492;8.567199;6.428804

2861;2.6014864;5.9248514;6.510526

2963;2.6014864;7.2324047;5.8158884

3066;-2.901134;8.308413;6.1563973

3170;-0.10896278;10.256122;4.276789

3272;0.95342433;6.428804;-5.6252036

3375;0.8308412;2.6423476;3.636633

3478;3.0645783;0.29964766;12.93933

3580;2.3699405;2.8602731;10.7192135

3683;1.6753027;5.5434813;3.2825038

3786;1.1032481;8.458236;2.0975335

3889;-0.8308412;8.22669;2.9419951

3991;-4.3585114;9.41166;4.508335

4094;-0.53119355;7.1234417;5.8976107

4197;3.0237172;5.706926;6.0474343

4300;2.3290794;4.167826;9.575105

4403;-4.399372;3.445948;7.572913

4506;-6.891896;5.5843425;5.5843425

4608;-1.4165162;5.1212506;7.1234417

4713;0.29964766;4.903325;7.273266

4814;-2.7513103;9.343558;3.3642259

4917;1.6753027;8.22669;6.891896

5019;2.901134;7.6137743;2.9419951

5123;-0.40861043;8.22669;2.7921712

5225;-2.0294318;9.384419;4.4810944

5329;2.4789033;7.6546354;4.780742

5431;-0.5720546;7.4639506;3.7864566

5534;-3.0645783;6.347082;8.499097

5637;2.5606253;3.255263;9.071152

5740;-0.8308412;3.9771416;6.851035

5843;-6.742072;4.0588636;8.730643

5946;1.293933;0.3405087;10.2152605

6048;2.8330324;2.0294318;7.9270425

6153;-4.5491962;8.648921;5.053149

6255;-1.1441092;7.9679036;5.965712

6358;2.4516625;7.4639506;0.3405087

6461;0.44947147;8.417375;0.5720546

6563;1.6753027;8.989429;3.091819

6668;3.636633;8.22669;0.6401563

6769;3.6774938;8.689782;2.4108016

6872;1.1849703;7.6137743;5.053149

6974;5.47538;7.572913;7.504812

7077;4.671779;6.66035;1.525479

7181;-0.44947147;6.810174;3.5549107

7283;-4.671779;5.284695;8.185829

7385;-0.3405087;2.7104492;6.66035

7488;-0.44947147;4.0861044;8.648921

7591;0.44947147;3.0645783;9.724928

7705;0.0;4.3176503;7.5456724

7796;-0.38136974;4.508335;8.308413

7899;-4.971427;3.0237172;8.839605

8002;-1.7978859;1.253072;9.152874

8104;3.0645783;0.9942854;9.302697

8209;6.932757;3.13268;9.493382

8310;4.5491962;5.3527966;6.238119

8413;1.0623871;6.891896;1.484618

8516;-3.3233647;8.771504;1.56634

8619;-5.7341666;7.04172;3.9771416

8723;-6.1291566;0.6810174;7.04172

8824;-1.7978859;-1.1441092;9.602345

8927;3.255263;-1.525479;9.956474

9030;6.006573;0.25878662;10.065437

9133;6.3198414;3.3642259;7.082581

9237;3.5140498;7.6954966;3.13268

9339;0.87170225;7.572913;1.525479

9441;-2.4516625;8.771504;1.1441092

9544;-6.3879433;6.469665;3.8681788

9650;-5.3936577;-0.25878662;8.880466

9750;-0.95342433;-2.982856;8.880466

9853;3.636633;-2.9419951;10.56939

9955;4.671779;-0.7627395;9.220976

10059;5.3527966;2.2473574;8.076866

10161;2.4108016;7.6137743;4.739881

10266;-0.21792556;7.5456724;2.2473574

10425;-2.7513103;8.267551;2.2473574

10470;-5.284695;5.3527966;5.3119354

10573;-5.7341666;-0.10896278;7.6546354

10676;-3.2825038;-2.6423476;8.798744

10779;0.87170225;-3.9362805;8.567199

10881;5.3119354;-1.4437568;11.563675

10984;5.1621118;0.06810174;9.833891

11087;3.091819;7.000859;4.4810944

11192;0.9942854;7.082581;3.214402

11293;-0.19068487;8.349273;3.4731886

11396;-1.334794;8.648921;2.9419951

11498;-1.0623871;8.567199;3.9771416

11601;-0.38136974;7.6137743;6.3198414

11703;-0.38136974;7.763598;5.5434813

11806;-0.3405087;7.763598;5.5162406

11908;-0.06810174;7.3822284;5.7750273

12011;0.0;7.4639506;5.965712

[Guest gspeed]

Here are some values

Time;X;Y;Z

614;0.14982383;7.3822284;5.706926

706;0.44947147;7.2324047;6.0882955

808;0.7218784;7.1506824;5.3936577

911;1.9477097;6.932757;5.7750273

1013;2.4108016;6.9599977;5.8567495

1116;2.4108016;7.082581;6.3198414

....

Thanks agaith! So it seems you are getting values each 100ms as well :) , could you confirm you set the "Log interval" to 10 or 50ms? If yes... well this seems a problem...

[Guest agaith]

Thanks agaith! So it seems you are getting values each 100ms as well :) , could you confirm you set the "Log interval" to 10 or 50ms? If yes... well this seems a problem...

Confirmed, log interval set to 10ms.

[Guest gspeed]

atch... so this seems a defect of the phone! :)

The next step would be to understand if the latest firmware or the upgrade to 2.1 is going to fix this...

;) Anyone who did upgrade to 2.1 or apply latest firmware from LG is experiencing the same issue?

Thanks

[Guest AerospaceMango]

atch... so this seems a defect of the phone! :)

The next step would be to understand if the latest firmware or the upgrade to 2.1 is going to fix this...

;) Anyone who did upgrade to 2.1 or apply latest firmware from LG is experiencing the same issue?

Thanks

12:58:18 x=1.1849703 y=6.66035 z=6.810174

12:58:18 x=0.95342433 y=6.469665 z=7.3549876

12:58:18 x=0.87170225 y=6.578628 z=7.2324047

12:58:19 x=1.2258313 y=6.428804 z=7.273266

12:58:19 x=0.9125633 y=6.510526 z=7.000859

12:58:19 x=0.9125633 y=6.578628 z=7.1915436

12:58:19 x=0.9125633 y=6.469665 z=7.3141265

12:58:19 x=0.7218784 y=6.469665 z=7.3822284

12:58:19 x=0.6810174 y=6.537767 z=7.3549876

12:58:19 x=0.8308412 y=6.2789803 z=7.4230895

12:58:19 x=0.8036005 y=6.347082 z=7.4639506

12:58:19 x=0.7218784 y=6.428804 z=7.3141265

12:58:20 x=0.8036005 y=6.347082 z=7.4639506

12:58:20 x=0.6401563 y=6.428804 z=7.3141265

12:58:20 x=0.7218784 y=6.428804 z=7.3822284

12:58:20 x=0.7218784 y=6.428804 z=7.4230895

12:58:20 x=0.7218784 y=6.428804 z=7.3141265

12:58:20 x=0.7627395 y=6.469665 z=7.3549876

12:58:20 x=0.8036005 y=6.469665 z=7.3549876

12:58:20 x=0.6401563 y=6.510526 z=7.2324047

12:58:20 x=0.6810174 y=6.510526 z=7.3549876

12:58:20 x=0.8036005 y=6.3879433 z=7.3549876

12:58:21 x=0.7627395 y=6.469665 z=7.3141265

12:58:21 x=0.7627395 y=6.469665 z=7.2324047

12:58:21 x=0.61291564 y=6.537767 z=7.3141265

12:58:21 x=0.7627395 y=6.469665 z=7.273266

12:58:21 x=0.7218784 y=6.469665 z=7.3549876

12:58:21 x=0.6810174 y=6.537767 z=7.3822284

12:58:21 x=0.7218784 y=6.510526 z=7.273266

12:58:21 x=0.7218784 y=6.428804 z=7.3549876

12:58:21 x=0.7627395 y=6.510526 z=7.504812

12:58:21 x=0.7218784 y=6.428804 z=7.1506824

12:58:22 x=0.7627395 y=6.428804 z=7.3822284

12:58:22 x=0.8036005 y=6.469665 z=7.1506824

12:58:22 x=0.7627395 y=6.537767 z=7.504812

12:58:22 x=0.7218784 y=6.66035 z=7.1915436

12:58:22 x=0.4903325 y=7.2324047 z=7.6954966

12:58:22 x=2.669588 y=6.742072 z=5.5162406

12:58:22 x=2.5606253 y=6.197258 z=7.082581

12:58:22 x=0.9125633 y=7.000859 z=7.6954966

12:58:22 x=-1.6344417 y=6.769313 z=6.891896

12:58:22 x=-1.1032481 y=2.1383946 z=7.4230895

12:58:23 x=2.901134 y=3.8273177 z=8.158588

12:58:23 x=5.6660647 y=2.2201166 z=7.763598

12:58:23 x=7.1915436 y=0.7627395 z=7.3549876

12:58:23 x=8.3765135 y=0.7218784 z=6.810174

12:58:23 x=8.3765135 y=-0.21792556 z=6.578628

12:58:23 x=8.3765135 y=-0.7627395 z=6.578628

12:58:23 x=8.417375 y=-0.6401563 z=6.347082

12:58:23 x=8.349273 y=-0.6810174 z=6.578628

12:58:23 x=8.308413 y=-0.61291564 z=6.537767

12:58:24 x=8.349273 y=-0.53119355 z=6.510526

12:58:24 x=8.267551 y=-0.6401563 z=6.537767

12:58:24 x=8.267551 y=-0.6401563 z=6.578628

12:58:24 x=8.308413 y=-0.53119355 z=6.578628

12:58:24 x=8.349273 y=-0.4903325 z=6.578628

12:58:24 x=8.308413 y=-0.6810174 z=6.619489

12:58:24 x=8.267551 y=-0.61291564 z=6.66035

12:58:24 x=8.267551 y=-0.44947147 z=6.578628

12:58:24 x=8.349273 y=-0.4903325 z=6.578628

12:58:24 x=8.308413 y=-0.5720546 z=6.537767

12:58:25 x=8.349273 y=-0.5720546 z=6.537767

12:58:25 x=8.458236 y=-0.4903325 z=6.469665

12:58:25 x=8.417375 y=-0.5720546 z=6.469665

12:58:25 x=8.417375 y=-0.6401563 z=6.347082

12:58:25 x=8.499097 y=-0.53119355 z=6.2789803

12:58:25 x=8.539958 y=-0.6401563 z=6.347082

12:58:25 x=8.539958 y=-0.61291564 z=6.2789803

12:58:25 x=8.539958 y=-0.7218784 z=6.347082

12:58:25 x=7.3822284 y=-0.38136974 z=7.9270425

12:58:25 x=4.671779 y=1.293933 z=9.874752

12:58:26 x=3.2825038 y=1.7570249 z=8.308413

12:58:26 x=-0.6401563 y=1.6753027 z=8.458236

12:58:26 x=-0.9942854 y=3.5549107 z=9.874752

12:58:26 x=-1.9885708 y=5.47538 z=9.220976

12:58:26 x=-0.8308412 y=6.2789803 z=7.763598

12:58:26 x=-0.10896278 y=6.1563973 z=7.2324047

12:58:26 x=0.0 y=6.1563973 z=7.3822284

12:58:26 x=-1.0623871 y=5.09401 z=6.1291566

12:58:26 x=-0.21792556 y=5.706926 z=8.308413

12:58:26 x=-0.6810174 y=4.69902 z=8.308413

12:58:27 x=0.53119355 y=4.2495484 z=8.730643

12:58:27 x=1.6753027 y=6.347082 z=6.347082

12:58:27 x=1.1849703 y=6.428804 z=7.9679036

12:58:27 x=0.9125633 y=6.469665 z=7.273266

12:58:27 x=1.0215261 y=6.469665 z=7.1506824

12:58:27 x=0.6810174 y=6.810174 z=6.769313

12:58:27 x=1.0623871 y=6.578628 z=6.891896

12:58:27 x=0.87170225 y=6.810174 z=6.810174

12:58:27 x=0.87170225 y=6.851035 z=6.9599977

12:58:28 x=0.87170225 y=6.851035 z=6.851035

12:58:28 x=0.8036005 y=6.9599977 z=6.769313

12:58:28 x=0.87170225 y=6.932757 z=6.891896

12:58:28 x=1.1032481 y=6.701211 z=6.742072

12:58:28 x=0.9942854 y=6.742072 z=7.1915436

12:58:28 x=1.0215261 y=6.742072 z=7.082581

12:58:28 x=1.6344417 y=6.769313 z=7.000859

Those are from my upgraded 2.1 540.....

Hope that helps!

[Guest gspeed]

thanks AerospaceMango - I suppose you where trying to log at 10ms or 50ms, right?

It seems you are getting about just 10 values per second, while you should get at least 20 with 50ms and much more at 10ms!!!

Atch... I bought this phone in order to play with the accelereometer for a project, according to google each android 1.6 device should comply with:

page 18 - http://source.android.com/compatibility/android-1.6-cdd.pdf :

8.10. Accelerometer

Device implementations MUST include a 3-axis accelerometer and MUST be able to deliver events at at

least 50 Hz. The coordinate system used by the accelerometer MUST comply with ....[/codebox]

Not sure what to do now... shall I contact LG or return the phone? :)

[Guest AerospaceMango]

thanks AerospaceMango - I suppose you where trying to log at 10ms or 50ms, right?

Absolutely! I think if you're unhappy, you should contact LG and see what they say before sending the phone back.

But that's just a personal thought!!!

[Guest gspeed]

ok, thanks for your tests again.

Just written to LG support (in Italy), let's see....

___

Dear support, I bought a GT540 with Android 1.6 SO with the purpose to develop applications leveraging the accelerometer. I found the data rate provided by the sensor does not comply with the minimum specs (see Android CCD doc attached, page 18). Max achievable rate is just 10Hz instead of 50Hz. By discussing with other people with the very same model, I found the issue is not affecting just my device. I'd like to know if you are aware of the problem and if a firmware upgrade exists to resolve it. I understand the request is really specific, but the same goes with the expected features to claim a phone certified with Android.

Pls. let me know if you need more details, feel free to have the tech support to contact me directly.

Thanks.

____

[Guest gspeed]

After one week, no reply at all from LG :) -I wrote them again, I expected at least an automatic reply stating that the question has been received, but nothing...

I wonder what else this might be affecting, for example, playing games should not be as smooth as it should be, applications like pedometer or speedometer should not work well- however it seems to me noone is complaining :)