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ndi is offline ndi
2010-09-20 , 15:46
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#51
Originally Posted by ysss View Post
I remember the iPhone 3GS compass could drift if you rotate it slowly, just like an analog compass with a stuck needle. Then again, that's not how you would realistically use a compass.
It wasn't a 4, it was a 3, true, but if N900 would have one it would probably be a 3-like.

How do you realistically use a compass? I watch it as I go around, and it takes me 20 seconds to make a corner on foot, for a larger corner, not running. I feel this to be realistic enough. Also, in a car, you can leave it in place and turn. Minding pedestrians, it's still a few seconds, more if yielding. I feel this to be more realistic than shake before use.
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TiagoTiago is offline TiagoTiago
2010-09-20 , 16:00
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#52
an electronic magnetometer don't got inertia, it always "point" north no matter how you shake or spin it
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ysss is offline ysss
2010-09-20 , 16:06
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#53
Originally Posted by ndi View Post
It wasn't a 4, it was a 3, true, but if N900 would have one it would probably be a 3-like.

How do you realistically use a compass? I watch it as I go around, and it takes me 20 seconds to make a corner on foot, for a larger corner, not running. I feel this to be realistic enough. Also, in a car, you can leave it in place and turn. Minding pedestrians, it's still a few seconds, more if yielding. I feel this to be more realistic than shake before use.
Not to be sidetracked (again), I think it's best to answer your original remark:

Originally Posted by ndi View Post
I find this to be unusable. Better to use GPS, photos, a map, or ask a camel than to think you are going the right way and actually going 90 degrees to the west.
The current implementation of digital compass is VERY usable. I'd reckon they work even better than an analog compass. Certainly easier than to ask a camel.

-------------

Originally Posted by TiagoTiago View Post
an electronic magnetometer don't got inertia, it always "point" north no matter how you shake or spin it
The one on iPhone 3GS (I think) is prone to magnetic interference. I didn't use it too often (only when trying out AR apps) and never had much problem with mine, but I've heard sporadic negative reports of it.
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Last edited by ysss; 2010-09-20 at 16:09.
 
daperl's Avatar
daperl is offline daperl
2010-09-20 , 17:08
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#54
Quite frankly, there's just too much ignorance flying around this thread. Some of us could explain how GPS, 3D accelerometers, magnetometers and clocks work, but then we'd have to kill you.
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TiagoTiago is offline TiagoTiago
2010-09-20 , 18:56
Posts: 1,522 | Thanked: 392 times | Joined on Jul 2010 @ São Paulo, Brazil
#55
well, north could change locally, but the magnetometer points to it

i can't picture a way you would be able to shield a regular compass from a close magnet, EM radiation, sure, but not plain magnetic field, though if the magnetic field is always at an exact offset from the magnetometer, you can calibrate it to ignore it (that way you can get rid of issues with speaker magnets etc, but depending on the wiring, it might still go crazy when the bass go bumping)
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Wikiwide is offline Wikiwide
2010-09-20 , 23:56
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#56
Quick reply about holography...
Research into holographic displays has produced devices which are able to create a light field identical to that which would emanate from the original scene, with both horizontal and vertical parallax across a large range of viewing angles. The effect is similar to looking through a window at the scene being reproduced; this may make Computer-Generated Holography the most convincing of the 3D display technologies, but as yet the large amounts of calculation required to generate a detailed hologram largely prevent its application outside of the laboratory. Some companies do produce holographic imaging equipment commercially.

http://en.wikipedia.org/wiki/Zebra_imaging
http://www.zebraimaging.com/products/motion-displays
 
TiagoTiago is offline TiagoTiago
2010-09-21 , 00:31
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#57
lightfield displays (true displays, not "hardcopy" holograms) require lots of processing for anything not pre-recorded, and still quite a bit for prerecorded stuff, due to the simple fact there is so much more information to be displayed at once


btw, i don't have a link at hand, but there is research being done on tactile feedback from virtual 3d environments in free air, somthing about focused ultrasound i think


and on a slightly more fictional note, it was Sony i think, they have a patent for a method of stimulating arbitrary neurons with transcranial focused ultrasound pulses, it's only on paper though, no experiments nor anything have been done
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gsever is offline gsever
2010-09-21 , 21:05
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#58
Originally Posted by TiagoTiago View Post
In my experience the GPS never gets more precise than a few meters, so you would need to take several steps to get a reasonable aproximate bearing
Confirmed! I walked out testing your hypothesis GPS locked using GPSJinni's compass. It nicely provides directional guidance. More than enough for me. The only annoyance is it usually takes a while [5-10 min] to get a good lock.
 
Russianhaxor is offline Russianhaxor
2010-09-21 , 21:16
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#59
Originally Posted by windows7 View Post
Do you know of any upcoming commercial physical hardware limitations for the n900 devices that may limit it's life?

for example: digital compass for me is one such limitation

The reason i ask this is because, i just purchased an android phone for my wife, very good deal for £99, and found afterwords that this phone will not be able to support flash 10.1 due to physical limitation at the hardware level.
Same processor as the Droid which runs Android 2.2 and Flash 10.1
 
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ndi is offline ndi
2010-09-22 , 11:50
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#60
Originally Posted by gsever View Post
The only annoyance is it usually takes a while [5-10 min] to get a good lock.
I assume that's non-assisted?
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