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rheve's Avatar
Posts: 108 | Thanked: 6 times | Joined on Feb 2007 @ France
#1
Their is a small button on the microphone. Does anybody knows what it is used for? Take an incoming call I suspect.

It would be great to be able to use it also for other purposes like "switch to next track" when you are using the N800 as a music player.
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N800
"Bois la Mondeuse, pète la dameuse. Qui bois la gnôle, casse la bagnole"
 
Posts: 34 | Thanked: 6 times | Joined on May 2006
#2
I think that's just because they've reused their normal phone headset and just added a new minijack connector. I would be very surprised if any input through the headset connector is accepted. When using a nokia headset connector (used for phones) there are more wires, one of which, I'm sure is for this button.

Good idea though. Another idea - inspired by recent reports on this forum would be to use your (Sony-Ericsson?) phone to remote control your N800. It seems it works right out of the box like on a normal PC. Great concept - I wish Nokia built this into their phones as well

// Kny
 
Posts: 227 | Thanked: 51 times | Joined on Feb 2006
#3
I believe there are no "extra connectors", otherwise plain headsets would not work in this jack. I think Nokia uses a resistor inside the headset to tell the 770 whether one of the audio channels is an input (microphone) or output (second audio channel.)

The button is a answer / terminate signal for calls that momentarily shorts one of the connectors.

I'm not 100% positive of this, but I believe that is the story.
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johsua's Avatar
Posts: 449 | Thanked: 18 times | Joined on Apr 2006 @ Eureka, CA
#4
I thought it was a mute button.
 
Posts: 4 | Thanked: 0 times | Joined on Dec 2007
#5
it;s a standart headset , in my Nokia N95 i have 7 buttons ot headset and 4 conector jack to phone but inside in the headset is MCU , i think there is no multy IO in jack for N800 this mus be inplemnted by hardware

sorry for my bad english, REGARDS FROM BULGARIA
 
Posts: 72 | Thanked: 12 times | Joined on Dec 2008
#6
"The dial button in the headset answers and disconnects the call. This is implemented by connecting the microphone to the ground."
"Basic headset (headphones + microphone + optional button): 2.5-mm or 3.5-mm, 4-pole connector, left-right-mic-ground, stereo headphones and microphone; optional button that connects the microphone line to the ground (used for call answering, call termination, and voice dialing).. "
http://www.forum.nokia.com/Resources...onnector.xhtml

I've read somewhere in the forum that you can use the button to answer skype calls.
 

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#7
Ernia hit the main points, HW-side; the 4-pole connectors work fine with 3-pole cables, the mic input is just shorted to ground that way.

SW-side, it does work in Skype. There's been a couple of solutions rigged to use BT headset's button as some sort of media control, and I believe one of them worked with (or has been adapted to work with) the wired headset's button as well.
 

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Posts: 72 | Thanked: 12 times | Joined on Dec 2008
#8
i think that the start for a developer to implement media control trough the 3.5 av jack (remember, i'm a newbie, have mercy ...) is this pdf
http://sw.nokia.com/id/81ba2105-f16d...on_v1_0_en.pdf
I was just trying to understand if it were possible to control media player (or mpd) trough an adapter like the nokia ad-54. i think it's really out of my reach.
if something has already been implemented i would like to know, if you can remember it. if not i will search the forum as soon i can get an ad-hoc connection with mer
 

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Posts: 22 | Thanked: 3 times | Joined on Mar 2009
#9
Yes; the Nokia 3.5mm 4-conductor has a second ring for the mic circuit, normalled to the sleeve as the left and right (tip and first ring, I *think*) circuits are.
 
OVK's Avatar
Posts: 559 | Thanked: 1,017 times | Joined on May 2008 @ Finland
#10
Originally Posted by ernia View Post
I was just trying to understand if it were possible to control media player (or mpd) trough an adapter like the nokia ad-54. i think it's really out of my reach.
if something has already been implemented i would like to know, if you can remember it.
This is something that I am also interested in. Did you find any useful information about this?
 
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