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'[EE]: What's this connector?'
2002\11\11@011536 by PicDude

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I need to interface some switches to a motherboard, and the keyboard
interface seems easy and cheap ($9), so my plan is to rip up this kbd,
steal the electronics and wire it up to my switches, but I need to
solder onto these connectors/pads...
   http://www.narwani.org/neil/stuff/kbd-interface.jpg

Anyone know what this solid black (carbon-like) material is? It contacts
the metal traces on the transparency when assembled, but I'm not sure I
can solder to it, and wanted to ask before destroy it.

(Other plan would be run the switches to a PIC which would emulate
the std AT keyboard signals, but I'd like to avoid the extra coding
for this one-off).

Cheers,
-Neil.

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2002\11\11@013528 by Dave Gomez

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> Anyone know what this solid black (carbon-like) material is? It contacts
> the metal traces on the transparency when assembled, but I'm not sure I
> can solder to it, and wanted to ask before destroy it.

Best bet on that black dot is it's a packageless chip, and the black goo is
the package substitute.  Saves on space and cost, which is why kbd's can be
had for 9 bucks.  the function of the chip, especially if you ran across no
other's, is probably the communication with the computer via the serial
connection, ie it translates the keys to serial port transactions, and also
accepts some serial port transactions to turn on things like led's and such.

dave gomez

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2002\11\11@015851 by PicDude

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Well, I know about the packageless chip, but I was referring to
the 27 black connectors at the bottom edge of the PCB (pointed
to by the arrow).  I've mapped out the keys to the connectors
and can bridge the connectors to get the appropriate keycodes
to the MB, but just need to know if they're solderable, or how
else I can securely connect to them.

Cheers,
-Neil.



Dave Gomez wrote:

{Quote hidden}

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2002\11\11@022134 by Quentin

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I haven't tried to solder on the "carbon" stuff, but this is what I
would do in your case:
Clean of the mask above the connector and solder the wires directly to
the tracks. It also looks like a single sided board so you can also
drill small holes next to each track and run the wires trough the other
side so to take the strain off the tracks.
This way you won't destroy the connector.
OTOH, it looks like a standard pitch connector. I think you might just
find an edge connector socket that will fit. You might have to either
cut slots into the board for the sides or cut back the sides on the socket.
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2002\11\11@025325 by PicDude

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Socket, huh?  This is why I ask, cause it's an elegant and
simple solution.

Thanks,
-Neil.


Quentin wrote:

> ...
> OTOH, it looks like a standard pitch connector. I think you might just
> find an edge connector socket that will fit. You might have to either
> cut slots into the board for the sides or cut back the sides on
> the socket.
> ...

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2002\11\11@120806 by Josh Koffman

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Hey Neil,
I don't know how to connect to that, but I'm sure the socket suggestion
is likely the easiest. Just for future reference, if you only need a few
buttons (up to 16 I think), there is PIC code out there to emulate a PC
keyboard. I don't remember if it's on the PICList website, or what it's
licencing scheme is, but it seemed good last time I looked at it.

Hope that helps out someday.

Josh
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PicDude wrote:
> I need to interface some switches to a motherboard, and the keyboard
> interface seems easy and cheap ($9), so my plan is to rip up this kbd,
> steal the electronics and wire it up to my switches, but I need to
> solder onto these connectors/pads...
>     http://www.narwani.org/neil/stuff/kbd-interface.jpg

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2002\11\11@142255 by Peter L. Peres

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On Mon, 11 Nov 2002, PicDude wrote:

*>Well, I know about the packageless chip, but I was referring to
*>the 27 black connectors at the bottom edge of the PCB (pointed
*>to by the arrow).  I've mapped out the keys to the connectors
*>and can bridge the connectors to get the appropriate keycodes
*>to the MB, but just need to know if they're solderable, or how
*>else I can securely connect to them.

Use conductive paint/epoxy. No soldering.

Peter

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