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-   -   metal detector app for N900 (https://talk.maemo.org/showthread.php?t=66789)

abhideva 2010-12-09 10:15
metal detector app for N900
 
hi all .... I am amazed by the metal detector app on N8 .... I'd like to know if this app is available for N900 or would it be possible to make one ???

efekt 2010-12-09 10:38
Re: metal detector app for N900
 
Eh? :confused:

TiagoTiago 2010-12-09 10:41
Re: metal detector app for N900
 
Depends, how does the one on the N8 do it?

anapospastos 2010-12-09 10:43
Re: metal detector app for N900
 
No compass no metal detector. Its already has been discussed on another thread.

abhideva 2010-12-09 10:43
Re: metal detector app for N900
 
Quote:
Originally Posted by efekt (Post 893141)
Eh? :confused:
The app detects metal when kept near the N8 ...

abhideva 2010-12-09 10:47
Re: metal detector app for N900
 
Quote:
Originally Posted by TiagoTiago (Post 893143)
Depends, how does the one on the N8 do it?
No idea ... but i think it recognises the metal when kept near it's usb slot on it's left side ...

TiagoTiago 2010-12-09 10:59
Re: metal detector app for N900
 
Compass? I was imagining it would work by combining the FM transmitter and the receiver, emiting a signal and then analyzing how the echo gets distorted...

efekt 2010-12-09 13:32
Re: metal detector app for N900
 
Quote:
Originally Posted by abhideva (Post 893148)
No idea ... but i think it recognises the metal when kept near it's usb slot on it's left side ...
No its not...

icebox 2010-12-09 19:15
Re: metal detector app for N900
 
the n8 has a compass (magnetometer actually). the n900 doesn't. By the way I heard of a nice app for android - that is a tricorder (like the ones in startrek) using all the available sensors (luxmeter, sound, magnetometer if available, gps, and so on) to present every possible kind of data to the user. Do we have anything like that?

tele 2010-12-09 19:48
Re: metal detector app for N900
 
Lol!!!!!!!!

gamerakel 2010-12-09 19:55
Re: metal detector app for N900
 
the tricorder app sounds great! : D

theonelaw 2010-12-09 23:36
Re: metal detector app for N900
 
Quote:
Originally Posted by TiagoTiago (Post 893158)
Compass? I was imagining it would work by combining the FM transmitter and the receiver, emiting a signal and then analyzing how the echo gets distorted...
TriCorder yup sounds like a killer app to be sure.

We could even hack a compass into your fm transmitter-receiver
notion - I am quite busy with other things but this sounds like
it could be a game-changer for the n900 usage.

I have my spare disassembled and am looking for space to
put a coil for just such a hack - looks like the only site would be
near the stylus insertion hole, which suggests an idea.
If we replaced the stylus with a long air coil it might be
possible to wire that into the FM side and get some interesting
results from ambient fm noise (I do work on ambient noise
data acquisition techniques in geophysics so it fits right in)
Any compass app would need to integrated with accelerometer
data to provide an orientation basis.

All this might hinge on being able to (quickly) toggle FM
transmit and receive functions (which may be too slow for interaction detection):(
but a passive coil on receive only might at least be useful
for detecting metal as the induction change from nearby
ferro-magnetics might be detectable by noise attenuations.:)

luiscesjr 2010-12-09 23:52
Re: metal detector app for N900
 
I want a tricorder to be able to read minds, is it possible?

zimon 2010-12-09 23:58
Re: metal detector app for N900
 
I just want FM-radio to work without headphones plugged in.
Having stylus as a FM-radio antenna sounds interesting and patentable. Let's license it here and now with GPL3.

Edit:
How to trick by software N900 to think headphones are connected when they are not, but there in the 3.5 mm hole is just saliva moisted stylus working as a FM-antenna?

I used to have "empty" 3.5mm plug with N95 with me, so I could listen FM-radio without headphones if I wanted. Just touching the connector with a finger usually got good reception on many FM-stations.

woody14619 2010-12-10 00:00
Re: metal detector app for N900
 
Quote:
Originally Posted by theonelaw (Post 893624)
I have my spare disassembled and am looking for space to put a coil for just such a hack
While looking, could you also look for something for me? :)

I've been toying with the idea of using a mylar ribbon cable, and a micro USB male/female connector set to "move" the micro USB port on the N900. This would reduce the chance of the on-board connector separating, as it would protrude only about as much as a standard case (and thus with a case on would be flush).

The problem being, where to put the female connector in such a way that it's also flush with the surface. I really don't care where it comes out of the case, as the ribbon is quite flexible. It could run under a compartment, and preferably under the outer case to wherever there is space to embed the female port. The problem is the width/height/depth of the port. Finding a space that's at least 7.8mm x 2.8mm with at least 3.8mm depth into the device is tough.

If you spot any area that looks large enough for that, I'd love a pointer to it. :)

johnel 2010-12-10 00:20
Re: metal detector app for N900
 
A tricorder app?

Cool!

All I need now is a salt/pepper pot and I can say:

"WeeaWeeaWeeaWeea.........He's dead Jim"

:)

theonelaw 2010-12-10 00:25
Re: metal detector app for N900
 
Quote:
Originally Posted by woody14619 (Post 893639)
While looking, could you also look for something for me? :)

I've been toying with the idea of using a mylar ribbon cable, and a micro USB male/female connector set to "move" the micro USB port on the N900. This would reduce the chance of the on-board connector separating, as it would protrude only about as much as a standard case (and thus with a case on would be flush).

The problem being, where to put the female connector in such a way that it's also flush with the surface. I really don't care where it comes out of the case, as the ribbon is quite flexible. It could run under a compartment, and preferably under the outer case to wherever there is space to embed the female port. The problem is the width/height/depth of the port. Finding a space that's at least 7.8mm x 2.8mm with at least 3.8mm depth into the device is tough.

If you spot any area that looks large enough for that, I'd love a pointer to it. :)
Looking now, just a moment....:D

tusharmax 2010-12-10 00:27
Re: metal detector app for N900
 
IR signals for detecting metal?.possible eh ?

luiscesjr 2010-12-10 00:57
Re: metal detector app for N900
 
Quote:
Originally Posted by tusharmax (Post 893652)
IR signals for detecting metal?.possible eh ?
But the IR of N900 can't receive signals, am I wrong? I guess it's just send.

Ele-Mental 2010-12-10 01:03
Re: metal detector app for N900
 
I want video to be recorded like a pic-in-pic skype call, where the person taking the video is also being recorded on the secondary cam. Is that possible?

theonelaw 2010-12-10 01:31
Re: metal detector app for N900
 
1 Attachment(s)
Quote:
Originally Posted by woody14619 (Post 893639)
While looking, could you also look for something for me? :)

I've been toying with the idea of using a mylar ribbon cable, and a micro USB male/female connector set to "move" the micro USB port on the N900. This would reduce the chance of the on-board connector separating, as it would protrude only about as much as a standard case (and thus with a case on would be flush).

The problem being, where to put the female connector in such a way that it's also flush with the surface. I really don't care where it comes out of the case, as the ribbon is quite flexible. It could run under a compartment, and preferably under the outer case to wherever there is space to embed the female port. The problem is the width/height/depth of the port. Finding a space that's at least 7.8mm x 2.8mm with at least 3.8mm depth into the device is tough.

If you spot any area that looks large enough for that, I'd love a pointer to it. :)
Ok - just carefully grind away next to the end of the stylus
and come through the adjacent edge near where it is now.
Looks like you would get about 5-6mm depth, tightly. ;)

The recessed-slider switch was another place of interest,
but it looks difficult to re-engineer the mechanism.
(I originally thought I had found a good spot but it goes through the (GSM?) antenna panel -oops) :o

TiagoTiago 2010-12-10 20:24
Re: metal detector app for N900
 
Quote:
Originally Posted by theonelaw (Post 893624)
TriCorder yup sounds like a killer app to be sure.

We could even hack a compass into your fm transmitter-receiver
notion - I am quite busy with other things but this sounds like
it could be a game-changer for the n900 usage.

I have my spare disassembled and am looking for space to
put a coil for just such a hack - looks like the only site would be
near the stylus insertion hole, which suggests an idea.
If we replaced the stylus with a long air coil it might be
possible to wire that into the FM side and get some interesting
results from ambient fm noise (I do work on ambient noise
data acquisition techniques in geophysics so it fits right in)
Any compass app would need to integrated with accelerometer
data to provide an orientation basis.

All this might hinge on being able to (quickly) toggle FM
transmit and receive functions (which may be too slow for interaction detection):(
but a passive coil on receive only might at least be useful
for detecting metal as the induction change from nearby
ferro-magnetics might be detectable by noise attenuations.:)
How about somthing a tad more complex mounted on the battery cover and interfacing with the SD card slot?

zimon 2010-12-15 22:19
Re: metal detector app for N900
 
Quote:
Originally Posted by zimon (Post 893638)
I just want FM-radio to work without headphones plugged in.
Having stylus as a FM-radio antenna sounds interesting and patentable. Let's license it here and now with GPL3.

.
Of course, there is already a patent about that - it is way too obvious to miss for anyone having stylus integrated to PDA's case.

TiagoTiago 2010-12-15 23:41
Re: metal detector app for N900
 
Btw, what about that big metal plate behind the screen, could you use that as an antenna?


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