Database Users

Camera...with strange bars

Hi,
some time when I take a movie, expecially with few light, some hateful horizontal bars come up on the screen. Once I had to SoftReset to have my camera working back. Did it happen to someone else? Should I go to an assistence service point?

You may try to play with "flicker adjustment" option in camera. Try to set it to 50 or 60 hz.

I've had this before, and it's usually because another program is running and using too much CPU.
Once I had to SoftReset to have my camera working back
Click to expand...
Click to collapse
Nothing wrong with a soft-reset, this will clear out any running programs, or you can use settings->memory->running programs->Stop all.

andyclap said:
I've had this before, and it's usually because another program is running and using too much CPU.
Once I had to SoftReset to have my camera working back
Click to expand...
Click to collapse
Nothing wrong with a soft-reset, this will clear out any running programs, or you can use settings->memory->running programs->Stop all.
Click to expand...
Click to collapse
thanx for your answer,
I supposed that it could depend on CPU. Infact, the first time I had this problem, XCPUu Scaler was running, and I thought that incostant level of CPU could bring noise to the cam function. But the last time I incurred into the same problem, I had uninstalled it yet, and probably, as you said, there should be some other app running that brang CPU to a lower level.

Well
I get this too, but it's generally when the radio has a particularly weak signal and is trying to find the operator. If you turn the radio off it generally goes away, same as if you're in an area where you get strong/full signal you probably/shouldn't get it.
Ant

Re: Well
requiem said:
I get this too, but it's generally when the radio has a particularly weak signal and is trying to find the operator. If you turn the radio off it generally goes away, same as if you're in an area where you get strong/full signal you probably/shouldn't get it.
Ant
Click to expand...
Click to collapse
Thanx for your answer...so it should be some like an interference...mmm interesting hypothesis... :idea:

exactly the same happens to my device when there is some activity on GPRS connections.

I have this when my gsm connection is being established and when a location update is being performed or am in a bad singal area (coming in and out of range of a cell). If you had the camera on during a call I can say 99% sure that you'll get the same interference.

Well, at least I am not alone with this problem... :?

8525 at 300mz normal??

I've recently upgraded to 8525 from 8125 and installed Battery status hack. I'm only getting a reading of 300mz on the today screen and the 8525 is supposed to be operating at 400mz. Is this normal because there's no activity while on today screen or should it show 400mz?
Thanks for any help

You might want to move this to the hermes forum...

i moved this thread to the hermes board, which is what the 8525 is..

walturbo said:
...and installed Battery status hack.
Click to expand...
Click to collapse
What's the battery status hack?

battery status is a today plugin that will show battery meter, your carrier, cpu freq, call time minutes, sms count, signal strength, storage, phone temp, etc.. cool little plugin
http://forum.xda-developers.com/showthread.php?t=270751

walturbo said:
I've recently upgraded to 8525 from 8125 and installed Battery status hack. I'm only getting a reading of 300mz on the today screen and the 8525 is supposed to be operating at 400mz. Is this normal because there's no activity while on today screen or should it show 400mz?
Thanks for any help
Click to expand...
Click to collapse
If your device is not a pre-production model then it's a 400MHz device.
However!!:
http://forum.xda-developers.com/showthread.php?t=283639&highlight=300mhz
Mike

and i didnt post it earlier but i was busy.. i spoke to ikarus about this issue and he stated:
ikarus said:
hm.. i don't know how to retrieve cpuspeed for samsung-cpus
300MHz is what windows mobile returns.
If you know how to do that, let me know.
Click to expand...
Click to collapse

GPS problems numerous. Sticky?

I propose that one of these GPS problem threads be made sticky since we cannot simply search "GPS" here and the GPS problems seem to be accumulating.
With that said, I would have to say that my GPS performance is pretty terrible. At first, it felt like doing the QuickGPS thing and/or deleting the xtra.bin file helped. For the most part, though, getting a lock has proven quite sporadic. What should the expectation here be? Should I expect the GPS to work reliably indoors? What about if I am near a window? Why would it work in some buildings near a window and not in others?
My personal opinion is that the GPS should work within 15-20 feet of a window. Using Chartcross GPS Test, even when the GPS is locked, I am getting mostly yellow bars. I am not exactly sure what a good reading looks like on Chartcross, but there appears to be a 25%, 50%, 75%, and 100% bar. Maybe the 25% bar is 100%? In any event, I rarely have a satellite that is getting above what I suspect to be 30%.
Is there a thread somewhere that details what the various fields mean and/or should read in Chartcross or a similar utility? I am coming up on my 30 days to return the phone, so if someone thinks that my device may be defective please speak up!
Thanks as always XDA-ers!

GPS signals are not strong, you have to be near a window (e.g. less than 50cm) or outside to get it to work properly. Inside I get 8 sats with too little to lock, outside I can get up to 11 locked. I use modified GPS settings to improve the lock. I've created a CAB for you.
http://rapidshare.com/files/179766394/X1_GPS_Enhancements.cab.html
Try them and then tell me how it works.

No you cant use it inside, but this has nothing to do with windows. Think of it this way:
To use the GPS, you need a line of sight to the sky, small barriers it will work through (like car roofs). So even a "line of sight" to a window, wont help you because of the thikness of the house roof. To be able to use GPS inside, you need something else, like a big antenna
Anyways, the GPS is for outside/car use only.

CantoX1i said:
No you cant use it inside, but this has nothing to do with windows. Think of it this way:
To use the GPS, you need a line of sight to the sky, small barriers it will work through (like car roofs). So even a "line of sight" to a window, wont help you because of the thikness of the house roof. To be able to use GPS inside, you need something else, like a big antenna
Anyways, the GPS is for outside/car use only.
Click to expand...
Click to collapse
That is partially true. The signal can "reflect" off surfaces as well, though - as with light - weaker. And it does have to do with windows simply because a window has a lot (lot!) less density than say, a brick wall. Less density means easier path for the signal. Being near a window does indeed increase the chance of signal lock.

Angelusz said:
That is partially true. The signal can "reflect" off surfaces as well, though - as with light - weaker. And it does have to do with windows simply because a window has a lot (lot!) less density than say, a brick wall. Less density means easier path for the signal. Being near a window does indeed increase the chance of signal lock.
Click to expand...
Click to collapse
hah, I did not know that! Thanks for informing me

I have a lock when I am inside all the time, usually about 5 satellites or so... out side that jumps considerably, in fact I was very impressed with the speed and sensitivity when compared to my Kaiser/TyTN II/MDA Vario III and I havent used quick gps yet... of course now I said that its going to be sods luck and it will [email protected] out on me...

Shadowdh said:
I have a lock when I am inside all the time, usually about 5 satellites or so... out side that jumps considerably, in fact I was very impressed with the speed and sensitivity when compared to my Kaiser/TyTN II/MDA Vario III and I havent used quick gps yet... of course now I said that its going to be sods luck and it will [email protected] out on me...
Click to expand...
Click to collapse
Well, it depends on several factors. If your home is made of wood instead of brick, that'll make a difference. If you live higher above sea level, it might make a difference. If you live on the countryside, that will definitely make a difference. I happen to live below sea level in a brick house in the middle of an average sized city. My reception won't be something to write home about

Angelusz said:
Well, it depends on several factors. If your home is made of wood instead of brick, that'll make a difference. If you live higher above sea level, it might make a difference. If you live on the countryside, that will definitely make a difference. I happen to live below sea level in a brick house in the middle of an average sized city. My reception won't be something to write home about
Click to expand...
Click to collapse
Ah see, I live on a hill in the country in a house made of straw... well not straw, its brick but still in the clear when it comes to being surrounded by other houses... this probably makes the diff... cheers

I've only had signal ONCE so far with my X1
It was at my living room window.
After that, no signal, ever. Not even out doors.
Im in NYC, plenty of buildings, but cmon somethings gotta be wrong. I even tried a hard reset to get it to work again. Nope... Bastard GPS ):

Nippero said:
I've only had signal ONCE so far with my X1
It was at my living room window.
After that, no signal, ever. Not even out doors.
Im in NYC, plenty of buildings, but cmon somethings gotta be wrong. I even tried a hard reset to get it to work again. Nope... Bastard GPS ):
Click to expand...
Click to collapse
Run quickGPS and install my cab. Try again and let us know!

Nippero:
you wont get any signal (or good accurate location) if you are in a big city.... your best bet is using google map w/ agps and let the cell tower locate where you are at
another thing I want to point out.... I tried using the gps on x1 when I was on the plane... while it was always able to lock on to a couple sats... it wasnt able to locate where I was at .... and the worst part is after I get back on the ground... the gps stop working and I had to hard reset my phone .... I tested it twice and both seems to be the case... so if you dont want to hard reset your phone.... I suggest you not to try it next time when you are on the plane

You guys must have really big houses to need GPS to work indoors

Angelusz said:
GPS signals are not strong, you have to be near a window (e.g. less than 50cm) or outside to get it to work properly. Inside I get 8 sats with too little to lock, outside I can get up to 11 locked. I use modified GPS settings to improve the lock. I've created a CAB for you.
http://rapidshare.com/files/179766394/X1_GPS_Enhancements.cab.html
Try them and then tell me how it works.
Click to expand...
Click to collapse
I really appreciate the quick reply and cab file. I will load it shortly. Is my understanding correct that A-GPS is turned off by default? If so, does this cab enable it? What improvement did you see with your cab file? Lastly, do you use Chartcross GPS test? I'm trying to figure out what the different fields/values mean in it.
Thanks!

Careful with changing the A-GPS to on by default. You can do this through Schapman's advanced configuration tool too, but I've had nothing but bad luck with it.
I use iGO8 and after I turned A-GPS on, the gps signal would drop every few seconds and would have a hard time finding satellites. Switching everything back to factory "defaults" and just using quickgps updates, I've had zero issues. Apart from the initial sat discovery, it's always fast to start and fast to pick back up (maybe 2-3 seconds) again.

jhoffa said:
Careful with changing the A-GPS to on by default. You can do this through Schapman's advanced configuration tool too, but I've had nothing but bad luck with it.
I use iGO8 and after I turned A-GPS on, the gps signal would drop every few seconds and would have a hard time finding satellites. Switching everything back to factory "defaults" and just using quickgps updates, I've had zero issues. Apart from the initial sat discovery, it's always fast to start and fast to pick back up (maybe 2-3 seconds) again.
Click to expand...
Click to collapse
Speaking of iGO8, does 8.1 work with the Xperia or only 8.3?

Dead link....
Hello everyone !
Can someone repost the cab file ? as it was uploaded to a limited RS account it is not downloadable anymore.....
Thanks a lot in advance !

Angelusz said:
GPS signals are not strong, you have to be near a window (e.g. less than 50cm) or outside to get it to work properly. Inside I get 8 sats with too little to lock, outside I can get up to 11 locked. I use modified GPS settings to improve the lock. I've created a CAB for you.
http://rapidshare.com/files/179766394/X1_GPS_Enhancements.cab.html
Try them and then tell me how it works.
Click to expand...
Click to collapse
Per RapidShare...
Error
This file is neither allocated to a Premium Account, or a Collector's Account, and can therefore only be downloaded 10 times.
This limit is reached.
To download this file, the uploader either needs to transfer this file into his/her Collector's Account, or upload the file again. The file can later be moved to a Collector's Account. The uploader just needs to click the delete link of the file to get further information.

odobo said:
another thing I want to point out.... I tried using the gps on x1 when I was on the plane... while it was always able to lock on to a couple sats... it wasnt able to locate where I was at .... and the worst part is after I get back on the ground... the gps stop working and I had to hard reset my phone .... I tested it twice and both seems to be the case... so if you dont want to hard reset your phone.... I suggest you not to try it next time when you are on the plane
Click to expand...
Click to collapse
GPS is only able to keep a lock under a certain speed. Airplanes are fast, so you will lose the lock. Once on the ground you can get a lock again by running QuickGPS. As your location has changed tremendously (depends on how far you fly ofc), the sattelites aren't where your phone thinks they are.
ohiosux said:
I really appreciate the quick reply and cab file. I will load it shortly. Is my understanding correct that A-GPS is turned off by default? If so, does this cab enable it? What improvement did you see with your cab file? Lastly, do you use Chartcross GPS test? I'm trying to figure out what the different fields/values mean in it.
Thanks!
Click to expand...
Click to collapse
You're welcome. My CAB does not enable aGPS, as it sometimes causes problems like quoted below. It changes some registry settings that basically tell your phone to keep looking for a better lock, for a longer period of time.
jhoffa said:
Careful with changing the A-GPS to on by default. You can do this through Schapman's advanced configuration tool too, but I've had nothing but bad luck with it.
I use iGO8 and after I turned A-GPS on, the gps signal would drop every few seconds and would have a hard time finding satellites. Switching everything back to factory "defaults" and just using quickgps updates, I've had zero issues. Apart from the initial sat discovery, it's always fast to start and fast to pick back up (maybe 2-3 seconds) again.
Click to expand...
Click to collapse
Do not that your individual experience with aGPS doesn't generalize to everyone. I've personally tried aGPS here. It made 0 difference (as far as I could tell), so turned it off again.
If you wish to try aGPS, feel free to do so, as it can be disabled as easily as it can be enabled, a hard-reset should not be neccesary.
ragnascroutch said:
Hello everyone !
Can someone repost the cab file ? as it was uploaded to a limited RS account it is not downloadable anymore.....
Thanks a lot in advance !
Click to expand...
Click to collapse
Yet again: http://rapidshare.com/files/180048557/X1_GPS_Enhancements.cab.html
As I don't have a better rapidshare account, it's yet again a 10-DL limit CAB. If anyone can mirror it for me, that'd be nice.

My iGO works fabulous after installing Angelusz's cab. GPS connection is now very fast even in my apartment.
What did u do man....?

Many thanks !
Angelusz said:
Yet again: http://rapidshare.com/files/180048557X1_GPS_Enhancements.cab.html
As I don't have a better rapidshare account, it's yet again a 10-DL limit CAB. If anyone can mirror it for me, that'd be nice.
Click to expand...
Click to collapse
Thanks a lot for the upload mate, i'll share some feedback when i'll have some time to test...
Cheers.

Battery Problem Blackstone

Hi, I'm new in this forum, and I don't speack English well, so I want to excuse me!
I have the new Touch HD, at the beginning I changed immediately the original ROM with a new one, I installed a lot of programs, and everything woked very well for two weeks, but then I had a big problems with battery...a the first the battery was very good, -10/15% per day, but suddenly after two weeks the battery lose 1% of its charge every 2/5 mintes...if I disconnect the power when the battery is 100%, after one hour without use (and also without wifi, BT and GPS), I have 70% of charge!
I try to change the ROM, a friend suggested me a new upgrade for Radio, but I didn't resolve my problem!
Now I buy a new battery online in htcstore, but if I put my mobile in "Fly mode" the battery work very very good!
I want to say that here normally I have the signal indicator with 2/3 nicks, so the signal is good!
Someone can help me?...someone have my same problem?
Thank you so much fo everything!
Greetings, Eddy

the battery will be used up quickly if your fone is constantly searching in and out for a 3g signal, regardless of 2g signal strength
have you got wifi on?
bluetooth?
a gps app running?
what other apps do you have running in background? some really poll the cpu a lot and will lead to battery drain
other than a dodgy battery, it must be some software running that is using up the battery

Thank you for aswering!
In background normally I have SMS o Contacs, but also if I close every programs in background the battery doesn't work well!
No, Bluetooth is OFF, GPS and WI-FI are OFF, I use telephone just with gsm!
Also when I write message, normally I write a message so long (3/4 messages), after wirting, the battery lost 10%, and I didn't have this problems at the biginning!
I left my mobile on also during the night, and in the morning I had again 100% of charge...now 100% it's a far dream!

try turning off the autoadjust for the screen and setting it at a medium setting, also make sure the backlight turns off after a minute or less.
its a huge screen and will burn up power, although saying that i watched a full length film on my HD the other day and only used 20% in 1.5hrs
if no progs are running in the background and its not a display issue (how have you checked whats running btw? need more than just WM taskmanager, try mem maid or similar) and the problem is not there when in flight mode. then i can only assume its the rom you are using, try another with a different radio rom in it
i found roms with 1.10 radio to be better than 1.09. try this rom (mulitlanguage) works good for me
http://forum.xda-developers.com/showthread.php?t=465637
edit: have you got HDTweak installed? its good to configure the data to auto turnoff after 1 minute or so (even in gsm gprs could be running)

I tried to setup the new ROM but I didn't resolve the problem!
If I leave my mobile only with GSM on, without use it, without call and sms, the battery lost 2% in 30 minutes, and it's not normal!
If I use it, change settings, write message, the battery lose 5% in five minutes!
I don't know what I have to do...this mobilie now can't live without a power connection!

I want say also that at the beginning some application in my HTC wanted "HTCAPI.dll" because they didn't found into the mobile...so I found this dll online and I did copy/paste into the directory!
It can gave me problems with battery?....I don't know how it's possible, but I don't know!

Try to buy or borrow another HD battery and compare them. You should know the problem then.

Of course, I alredy bought it online, and I'm waiting to get the shipping!
But it's very strange that a battery stop to work suddenly, but I know that there are a lot of people who have my same problem!

If i were you, i would flash back the original rom and do a hard reset. Then, without installing anything on the device, see if the problem persists.

Thank you ardsar...I want to try....can you tell me, what I have to do to obtain the original product?...without hardspl and new rom?...like the first time that I turned on this HD! Thank you so much!
For example, I have your same SPL and ROM at the moment!

Hi Ardsar, I flashed my ROM and SPL (brand), and now my mobile is like the original but....do you know Teeter?...I played 2 minutes, I completed 3 levels, and from 85% the battery is now at 79%...

Hi guys...yesterday I did a lot ot tests, but without positive results, but I fund out new problems:
1)The bettery lose a lot of charge also if my Blackstone is offline, when I use it with TouchFLO, Teeter, SMS, Settings...everytime!
2)I have near to icon of signal, the simbol of GPRS, but sometimes it changes with the simbol H and with this new symbol, the signal falls and to resolve it, I have to wait a long ore reset the mobile.
Now I'm not sure that the "target" is the battery...I don't know, I changed also the Radio ROM with new last, but the problem is not over!
Before put it into garbage case, someone can suggest me something to try?
...I will never bring it to Assistence HTC, because I will have to wait some months, and I didn't pay 500€ to have it "under repairing"

Do you have SK Tools 4.4.6 or another battery monitor installed?
With SK Tools, you can see under the sys info the current battery use. My usage is in standby with lighted display -100mA. What's normal?
My battery is also very empty. Last evening i had 54%. This morning, the phone was off, no power any more.

No, now I will try this tool!
But I think that you also have problem with battery, becase the firsts days that I had my HD, I left my mobile on the whole night with 100% and in the morning I had 100%...I had 99% at lunch time!And a lot of friends that have this mobile have the battery so strong, like me at the beginning...so...I'm getting angry

i have this problem too. had my HD for 2 weeks coming to 3 now and my battery seems to deplect very fast, totally different when i had it. could be becoz of the wallpaper and 3rd party theme i had

For me, it seems it's a software or anything else that needs so much battery power, perhaps the hotfixes or something else.
Sadly, the whole battery monitor progs don't show the needed power per running process, only the current usage. Can anyone with a "good" battery life cann post his current usage? (For expample with SK Tools System Information/battery supply)
Is the backup battery always at 0%?

Battlog
How about this. You can log your activities and see how much battery current (discharge) each application is using by the ma figure. It produces a .log file but if you change it to .txt you can open it up in a text editor.
Hope it helps.
EDIT: Just found out there is better info on it here on XDA Raphael forum. Credits to PalladiumTD for this app.

Today I tried a new battery, and also with a good battery, I have the same problem...so I think that I have to send my mobile to HTC service and ask for a new one, because it can be an internal problem, maybe of motherboard, radio, or I don't know...but it's sure that is hardware problem!

Did you a hard reset and installed nothing else?

Yes, I did...I alredy unpacked it and monday I will send it to HTC service....I hope that they will sed me a new one....a friend said to me that maybe this problem for them is called DOA (dead on arrived) and in this case they have just to change it!I hope so!....but I don't like...!
I know that I can reset it pushing the volume control ecc.....someone knows it exactly?Thank you!

Distance between two devices (with a high accuracy)

Hi,
i need a Tool to calculate the distance of two devices with an accuracy of about 1 meter by a distance of 0-3 meter.
GPS doesn't suite this needs, but i guess bluetooth signal-strength does.
I was looking up the android bluetooth api but can't find anything to read signal strength. Anyone any tips how to get on the strength of the bluetooth signal?
thanks, exec

Cool idea
That is a pretty cool idea. I'm not a developer but I like it.

Another way is to use sound along with a tcp/ip or bluetooth connection
1) keep track of each phone's clock (or difference between)
2) make the second phone chirp/beep and record
a)the time the second phone started the beep
b)the time the first phone heard the beep.
3) calculate the distance using the amount of time it took to hear the beep.
note: the speed of sound may differ slightly but should be within your accuracy range
see http://www.sengpielaudio.com/calculator-soundpath.htm for an example.

nice idea, i'll keep this in mind. But for the moment it doens't fit my needs, cause it can be a loud enviorment with a lot of phones where i have to find the nearest one

exec87 said:
nice idea, i'll keep this in mind. But for the moment it doens't fit my needs, cause it can be a loud enviorment with a lot of phones where i have to find the nearest one
Click to expand...
Click to collapse
A pure tone at an agreed upon frequency will be hard to miss. If you have the service installed on all the phones you can query each one in turn and then figure out which one is nearest.

do you know any example how to analyse the frequenze of the current recorded tone?

exec87 said:
do you know any example how to analyse the frequenze of the current recorded tone?
Click to expand...
Click to collapse
This looks promising
http://code.google.com/p/moonblink/wiki/Audalyzer

sry but if you want to measure distances of up to 3 metres with the help of sound speed, that wont work
sonic speed is 343m/s, that means it takes 0,002.9sec for one meter to pass.
or otherwise, it would pass the 3 meters in 0,008.7 sec for 3m
to compare it, a nexus one would do a clock cycle every 0,000.000.01 seconds, and in that time, the sound weave moves 0,000.000.343 metres.
So if you're optimistic and it takes "only" 100.000 to 500.000 cycles to sample the sound AND compare it to the clock, your diffrence of that two cases would be 3cm to 15cm, so you got a standard "uncorrectness" of about 12cm.
but thats if it takes 100.000 to 500.000 cyles, and it would be worse if it takes more time or if the clock is not 100% correct (this example is with a 100% exact clock)
if the clock is only correct for 1ms, you must add another 30cm of "uncorrectness"

arthofer said:
So if you're optimistic and it takes "only" 100.000 to 500.000 cycles to sample the sound AND compare it to the clock, your diffrence of that two cases would be 3cm to 15cm, so you got a standard "uncorrectness" of about 12cm.
but thats if it takes 100.000 to 500.000 cyles, and it would be worse if it takes more time or if the clock is not 100% correct (this example is with a 100% exact clock)
if the clock is only correct for 1ms, you must add another 30cm of "uncorrectness"
Click to expand...
Click to collapse
Dont think sampling and processing cpu-time matters so much as to make this method unusable.
a)The sample time does not matter. It will be:
system time when the recording started + time within the sample where the frequency is found (comparison is part of post-processing). The sample window can be fixed at 0.5 seconds (or less) as 343/2= 171.5m is huge.
The phone emitting the frequency can be triggered over wifi/radio and that will be very very quick (speed of light+message processing time)
b)the time taken for the comparison will not matter as its done after the event has occurred. (post-processing)
The 1ms clock problem can possibly be overcome by using System.nanoTime()

exec87 said:
Hi,
i need a Tool to calculate the distance of two devices with an accuracy of about 1 meter by a distance of 0-3 meter.
GPS doesn't suite this needs, but i guess bluetooth signal-strength does.
I was looking up the android bluetooth api but can't find anything to read signal strength. Anyone any tips how to get on the strength of the bluetooth signal?
thanks, exec
Click to expand...
Click to collapse
Maybe use a ruler?
Sorry that I can't stop myself doing this after reading your question
ok, to a more serious side, if bluetooth don't work, then maybe use wi-fi. don't know if they have the api for wi-fi to measure signal strength neither.

What if you had one phone act as a Wi-fi hot spot, then the other connect to it. Then someone write an app that will use GPS to determine the distance between the two. IDK, just a shot in the dark. I really dont have a lot of knowledge about that stuff.

You could use a PRF (pulse repitition frequency) but I have no idea what these would be for bluetooth or even the radios. Honestly I think using the GPS coordinates and distance equation would be the easiest.

Unfortunately our consumer gps's rarely go down to 1m, and that the max... And it will likely not work indoors

britoso is right... i'll keep the hint with wlan strength in mind, but atm i'm working at the audio idea... it's a little bit hard, and first tests show that an accuracy of 1-2 meters is possible... i'll reply if i'm done.
however i'm thankful for EVERY input
edit: i think i will give up... the delay of analyzing the sound is between 150ms and 250ms... and i can't see in code where this 100ms difference come from... i think i need a kind of realtime system to build this...

exec87 said:
britoso is right... i'll keep the hint with wlan strength in mind, but atm i'm working at the audio idea... it's a little bit hard, and first tests show that an accuracy of 1-2 meters is possible... i'll reply if i'm done.
Click to expand...
Click to collapse
however i'm thankful for EVERY input

exec87 said:
edit: i think i will give up... the delay of analyzing the sound is between 150ms and 250ms... and i can't see in code where this 100ms difference come from... i think i need a kind of realtime system to build this...
Click to expand...
Click to collapse
If you can PM me the code I can take a look.
I didn't want to start coding this because
a) I only have one phone
b) havent used the bluetooth API.
I'm comfortable using tcp/ip though

i don't know if this is impossible.. but i think its worth the try.. i'm horrible at development nor i have taken any advanced math courses... so heres the concept:
how about getting two people hold a phone facing each other.... they both have to hold the phone upright and straight...(using Spirit Leveler)
with one of the phones... the app takes a picture of the other phone... and asks you to point out the phone's height in the picture...
and given the real height of the phone (this should be a dropdown box for known phone types.. and custom if you want to use a credit card... or anything else u find) it should tell you the height..
possible?

oh and one more thing.. u can have the phone's screen facing the camera with white background and black DOT... if that helps to do live tracking of the phone's size...??

britoso said:
If you can PM me the code I can take a look.
I didn't want to start coding this because
a) I only have one phone
b) havent used the bluetooth API.
I'm comfortable using tcp/ip though
Click to expand...
Click to collapse
This is what i first thought of when i saw this thread. Why not establish an ad-hoc network and send over a series of pings, each one send over one packet of info from phone A to phone B. have phone B process the information and show its good then send it back to A and have it verify it also. Then based of this data(and experiments to see hwo long it takes to process the information. you the time from a-b-a to calculate the distance.
This is all hoping that the speed of travel of the packet is not to fast to calculate the distance lol.

Any results?
This is the exact answer I'm looking for, which method produce better accuracy, is it the sound (measuring time difference) or the signal strength test (measuring the RSSI)