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'[EE]: ATX power on?'
2004\07\14@181737 by Marc

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Hi all...

Best I can make out, to trigger power-on on an ATX motherboard, you need
to pull to TTL low momentarily? Anyone vouch for this?

Is decoupling or anything else required on this signal path? My goal is
to control on/off of an ATX PC (and power supply) via a PIC and IR.

TIA,

-marc

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2004\07\14@185547 by Matthew Brush

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Just bust out your multimeter on the power button on your case and see
what it does.  I think it just brings that signal low for 4 seconds
(that setting is in BIOS).

If you wanted to really half-ass it, you could probably just replace the
mechanical button with a small relay switch driven by your PIC (with
Transistor & diode).

It would be really easy to make your PIC toggle your computer on and off
whenever you point ANY remote control at it and press ANY button.

Good luck, cheers.

Marc wrote:

{Quote hidden}

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2004\07\14@190755 by Jinx

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> Best I can make out, to trigger power-on on an ATX motherboard,
> you need to pull to TTL low momentarily? Anyone vouch for this?

There's a pullup to Vstandby in the I/O controller. Grounding will
boot the computer.

In a recent magazine article someone suggested the following -

Adding a series 100R on PWRBTN# and a 470uF across the
switch (!!!!! NOTE this is NOT for PCs that have mains on the
power switch !!!!!!!) performs an auto-boot when mains is turned
on at the wall. It's like pulling /MCLR momentarily low on a PIC
when Vcc is applied

> Is decoupling or anything else required on this signal path? My
> goal is to control on/off of an ATX PC (and power supply) via a
> PIC and IR

I'd make sure that ONLY a long-ish stream of IR pulses or coded
signal can get through to the switch, otherwise any old Tom Dick
or Harry glitch coming out of the IR receiver will cycle the PC

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2004\07\14@191002 by Alex Harford

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On Wed, 14 Jul 2004 18:15:26 -0400, Marc <EraseMEmarcspam_OUTspamTakeThisOuTgeekythings.com> wrote:
> My goal is
> to control on/off of an ATX PC (and power supply) via a PIC and IR.

What about using a Wake-On-(LAN/Ring).  Does your motherboard have a
header for that?

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2004\07\14@192249 by Marc

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On Wed, 14 Jul 2004, Alex Harford wrote:

> On Wed, 14 Jul 2004 18:15:26 -0400, Marc <@spam@marcKILLspamspamgeekythings.com> wrote:
>> My goal is
>> to control on/off of an ATX PC (and power supply) via a PIC and IR.
>
> What about using a Wake-On-(LAN/Ring).  Does your motherboard have a
> header for that?

Not an option for this application ;-)

-marc

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2004\07\14@221650 by hilip Stortz

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i wouldn't say that's half-ass at all, in fact it would be smart to use
a relay or some sort of isolation.  when i get my assorted machines all
setup and networked i'll be making a kvm, with a button to turn the
machines on, some will be macs, on the pc's i'll use an opto isolator on
the "wake on lan" connector, another possibility, assuming you want to
turn on a computer.  i suspect however that the poster just want's to
turn on the power supply to do something else useful with it since they
are relatively cheap and plentiful.

Matthew Brush wrote:
>
> Just bust out your multimeter on the power button on your case and see
> what it does.  I think it just brings that signal low for 4 seconds
> (that setting is in BIOS).
>
> If you wanted to really half-ass it, you could probably just replace the
> mechanical button with a small relay switch driven by your PIC (with
> Transistor & diode).
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2004\07\14@231419 by David P Harris

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I suspect the suggestion was to use the header to wake-up the
motherboard by supplying the appropriate signal from you logic, not that
you should use a LAN or modem.
David

Marc wrote:

{Quote hidden}

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2004\07\15@001808 by Alex Harford

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Exactly!

But maybe the mobo doesn't have those headers...

On Wed, 14 Jul 2004 20:13:08 -0700, David P Harris <dpharrisEraseMEspam.....telus.net> wrote:
{Quote hidden}

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