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'[EE] Keyboard and monitor switch'
2005\06\17@143555 by Mauricio Jancic

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face
Hi,
       I want to make a switch for my keyboard and monitor at home, to
switch between server and client PC. I don't want to use electromechanical
relays, so what do you think I should use? Any ideas of what is comonly
used?

Best regards,

Mauricio

2005\06\17@144636 by Jan-Erik Soderholm

face picon face
Mauricio Jancic wrote :

> Hi,
> I want to make a switch for my
keyboard and
> monitor at home, to switch between server
> and client
PC...

I must ask, since these boxes ("KVM-switch")
can be found for
close to nothing "down town",
why build one yourself ?

Jan-Erik.



2005\06\17@144921 by olin piclist

face picon face
Mauricio Jancic wrote:
> I want to make a switch for my keyboard and monitor at home, to
> switch between server and client PC. I don't want to use
> electromechanical relays, so what do you think I should use? Any ideas
> of what is comonly used?

Why are you ruling out relays, like reed switches?  They seem like the best
solution.

2005\06\17@150359 by Mauricio Jancic

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face
> I must ask, since these boxes ("KVM-switch") can be found for
> close to nothing "down town", why build one yourself ?

... Just because I want to... :) want to make something that is controlled
by either PC, and that's not precisly cheap, nor easy to find here in
Argentina... But mostly, because I want to...

>> Why are you ruling out relays, like reed switches?  They seem like the
best solution.

I thougt there might be a better solution out there, less board space
mostly.

Does anyone knows if the standard units use relays or anything like that?

With the mouse and keyboard I can make an interface with a MCU, so it can
also "read" commands issued from the keyboard, but I have doubts about the
monitor, I don't have a clue on how its signals are, nor wich levels it
uses...

Regards,

Mauricio

2005\06\17@163201 by Herbert Graf

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On Fri, 2005-06-17 at 15:35 -0300, Mauricio Jancic wrote:
> Hi,
>        I want to make a switch for my keyboard and monitor at home, to
> switch between server and client PC. I don't want to use electromechanical
> relays, so what do you think I should use? Any ideas of what is comonly
> used?

While I'm all for making stuff, in this case I'd say just buy one. You
can get a solid state one in my area for around $30. Hit num lock twice
quickly to switch displays. Does keyboard and mouse as well.

I have two and they work flawlessly. Since they emulate a
keyboard/mouse/montior on the port that isn't active you can reboot a PC
and not worry about the mouse not being detected, or the monitor
starting up in some bad mode. TTYL

-----------------------------
Herbert's PIC Stuff:
http://repatch.dyndns.org:8383/pic_stuff/

2005\06\17@175151 by Mike Hord

picon face
>         I want to make a switch for my keyboard and monitor at home, to
> switch between server and client PC. I don't want to use electromechanical
> relays, so what do you think I should use? Any ideas of what is comonly
> used?

I'd like to ask you to reconsider purchasing.  The keyboard/mouse bit (for
PS/2, at least) probably isn't that tough, but I think switching the video
would tend to be a bit harder without adversely affecting image quality.

If nothing else, maybe you can get an old one and then build a nice
control mechanism with a PIC for it.

Mike H.

2005\06\17@180736 by Mauricio Jancic

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face
Yes... I know I should go and buy one. Perhaps I will and then built a
custom control to it, but still wonder how one might switch video
signals.... Any Ideas?

Mauricio Jancic
Janso Desarrollos - Microchip Consultants Program Member
spam_OUTinfoTakeThisOuTspamjanso.com.ar
http://www.janso.com.ar
(54) 11 - 4542 - 3519


> {Original Message removed}

2005\06\17@181858 by Mike Hord

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> Yes... I know I should go and buy one. Perhaps I will and then built a
> custom control to it, but still wonder how one might switch video
> signals.... Any Ideas?

Go to the website of your supplier of choice and search for
"video multiplexer".  Digikey yields MAX310CPE- 16DIP
8-to-1 video mux.  You'll need more than one, because
you need to multiplex several signals.  The MAX310 might
be a bit steep for that at ~$18 per, but a 2-to-1 or 4-to-1
will be much cheaper.

Ah.  LT1203.  2-to-1 for $3.30.  Something of this ilk should
be available locally for you.  I don't think a simple CMOS
analog switch will have the bandwidth, though.

Mike H.

2005\06\17@212908 by John Ferrell

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This is not as trivial as it might seem. There are states to be preserved.
The cables can cost as much as the device. I have a Belkin SOHO 4 way that
works very well. I bought it a long time before the less expensive models
were available.
John Ferrell
http://DixieNC.US

{Original Message removed}

2005\06\17@234522 by Charles Craft

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Maxim has a sample program that's just about as good as Microchip's.
They're generous with parts and ship pretty quick.

I got some of the video switch chips for a home A/V setup but went with a multi-channel
video modulator instead.

{Original Message removed}

2005\06\18@025626 by Wouter van Ooijen

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> Maxim has a sample program that's just about as good as Microchip's.
> They're generous with parts and ship pretty quick.

What they lack is a buy-maxim site where you can acutally buy quantities
of the chips they so generously sample.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2005\06\18@072920 by Gerhard Fiedler

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Wouter van Ooijen wrote:

>> Maxim has a sample program that's just about as good as Microchip's.
>> They're generous with parts and ship pretty quick.
>
> What they lack is a buy-maxim site where you can acutally buy quantities
> of the chips they so generously sample.

Don't they have such a site? The only thing with it is that I regularly see
lead times of various months for the parts I would like... and then select
a part from a different vendor :)

Gerhard

2005\06\18@083153 by Wouter van Ooijen

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> > What they lack is a buy-maxim site where you can acutally
> buy quantities
> > of the chips they so generously sample.
>
> Don't they have such a site? The only thing with it is that I
> regularly see
> lead times of various months for the parts I would like...
> and then select
> a part from a different vendor :)

Lead times of months and/or minimum order quantities of several k IMO
disqualify the site as "a site where you can actually buy", like you can
on buy Microchip.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2005\06\18@090047 by Jan-Erik Soderholm

face picon face
> > Maxim has a sample program that's just about as good as
Microchip's.
> > They're generous with parts and ship pretty quick.
>
> What they lack is a buy-maxim site...

And non-SMD versions of their
devices... :-)

Jan-Erik.



2005\06\18@092431 by olin piclist

face picon face
Wouter van Ooijen wrote:
> What they lack is a buy-maxim site where you can acutally buy
> quantities of the chips they so generously sample.

I heard there are a couple guys in Malasia running a site like that.  The
availability is a little spotty, but the prices are real good  ;-)


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

2005\06\18@122204 by Peter

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On Fri, 17 Jun 2005, Jan-Erik Soderholm wrote:

> I must ask, since these boxes ("KVM-switch")
> can be found for
> close to nothing "down town",
> why build one yourself ?

You must implement a high frequency buffer/switch for xVGA and a sproper
PS/AT state machine for keyboard and mouse. If you don't both attached
systems may freeze when you switch over (f.ex. if the mouse moves a
little when you do this).

The very cheap boxes are just switches. Don't touch them.

Peter

2005\06\18@122326 by Peter

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> Mauricio Jancic wrote:
>> I want to make a switch for my keyboard and monitor at home, to
>> switch between server and client PC. I don't want to use
>> electromechanical relays, so what do you think I should use? Any ideas
>> of what is comonly used?
>
> Why are you ruling out relays, like reed switches?  They seem like the best
> solution.

The 'cheap' boxes use a multi-contact rotary switch. Since they do not
preserve the state of the PS/2 lines to the keyboard and mouse they have
a huge lockup potential and often cause ghosts in the picture at high
resolution.

Peter

2005\06\18@122517 by Peter

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On Fri, 17 Jun 2005, Mauricio Jancic wrote:

> monitor, I don't have a clue on how its signals are, nor wich levels it
> uses...

3 x RGB 1Vpp (0.7Vpp video w/o sync or 1Vpp sync on green) 75 Ohms 100MHz bandwidth
2 x sync 5Vpp ttl level
3 x VESA feature bits 5V ttl level

Peter

2005\06\18@123202 by Peter

picon face

On Fri, 17 Jun 2005, Mauricio Jancic wrote:

> Yes... I know I should go and buy one. Perhaps I will and then built a
> custom control to it, but still wonder how one might switch video
> signals.... Any Ideas?

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1250 -> MAX498

(watch out for the price). Also check Elantec and NJRC.

Peter

2005\06\20@055117 by Alan B. Pearce

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>> What they lack is a buy-maxim site where you can acutally buy
>> quantities of the chips they so generously sample.
>
>I heard there are a couple guys in Malasia running a site like
>that.  The availability is a little spotty, but the prices are
>real good  ;-)

<VBG> you just gotta find the truck they are using today ;))

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