ON/OFF Switch for a Computer?
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Posted by Paul on March 30, 2008, 2:18 pm
Please log in for more thread options This may be a newbie question, but i'd like some schematics for the ON/OFF switch of your standard computer. In other words, a solid-state switch that will allow the computer to do a soft OFF procedure, where the computer boots down before turning off. Ideally, it would be 3-4 seconds push-to-hold to start the power-ON and boot-up sequence. And 3-4 seconds push-to-hold to bring up a "Do you really want to shutdown? YES/NO" prompt on the LCD screen, and after touching "YES" on the screen, the computer will boot down the OS, and shut down. However, if the boot down somehow hangs up, i'd like to retain the option of a "hard-turn-OFF", like almost all computers now have, where the ON/OFF button can be depressed for something like 5 seconds, and the computer will shut down immediately (no "soft" OFF boot down). If anyone out there has a schematic, that would be great. Thanks. | |||||||||||||||||||||||||||||||||||||||||||
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Posted by TT_Man on March 30, 2008, 2:33 pm
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Posted by Tam on March 30, 2008, 3:37 pm
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>
>> Hello,
>> >> This may be a newbie question, but i'd like >> some schematics for the ON/OFF switch of your >> standard computer. In other words, a solid-state >> switch that will allow the computer to do a soft >> OFF procedure, where the computer boots down >> before turning off. >> >> Ideally, it would be 3-4 seconds push-to-hold >> to start the power-ON and boot-up sequence. And >> 3-4 seconds push-to-hold to bring up a "Do you really >> want to shutdown? YES/NO" prompt on the LCD screen, >> and after touching "YES" on the screen, the computer >> will boot down the OS, and shut down. >> >> However, if the boot down somehow hangs up, >> i'd like to retain the option of a "hard-turn-OFF", like >> almost all computers now have, where the ON/OFF >> button can be depressed for something like 5 seconds, >> and the computer will shut down immediately (no >> "soft" OFF boot down). >> >> If anyone out there has a schematic, >> that would be great. Thanks. >> >> > It's all done in software....
I don't think the hard-OFF is. That has to work even if the CPU has stopped.
Probably a big RC or digital time constant that bypasses everything. Tam | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Paul on March 30, 2008, 9:14 pm
Please log in for more thread options >
> > > > > > >> Hello,
>
> >> =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BDThis may be a newbie q=
uestion, but i'd like
> >> some schematics for the ON/OFF switch of your
> >> standard computer. =EF=BF=BDIn other words, a solid-state > >> switch that will allow the computer to do a soft > >> OFF procedure, where the computer boots down > >> before turning off. >
> >> =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BD Ideally, it would be 3-4 second=
s push-to-hold
> >> to start the power-ON and boot-up sequence. =EF=BF=BDAnd
> >> 3-4 seconds push-to-hold to bring up a "Do you really > >> want to shutdown? YES/NO" prompt on the LCD screen, > >> and after touching "YES" on the screen, the computer > >> will boot down the OS, and shut down. >
> >> =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BD However, if the boot down someh=
ow hangs up,
> >> i'd like to retain the option of a "hard-turn-OFF", like
> >> almost all computers now have, where the ON/OFF > >> button can be depressed for something like 5 seconds, > >> and the computer will shut down immediately (no > >> "soft" OFF boot down). >
> >> =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BD If anyone out there has a schem=
atic,
> >> that would be great. =EF=BF=BDThanks.
>
> > It's all done in software....
>
d.
> I don't think the hard-OFF is. That has to work even if the CPU has stoppe= > Probably a big RC or digital time constant that bypasses everything.
> Tam- Hide quoted text - > > - Show quoted text - True. The hard-OFF is separate from the software, completely. | |||||||||||||||||||||||||||||||||||||||||||
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Posted by T on March 30, 2008, 5:20 pm
Please log in for more thread options Someone@ntlworld.com says...
>
> > Hello,
> > > > This may be a newbie question, but i'd like > > some schematics for the ON/OFF switch of your > > standard computer. In other words, a solid-state > > switch that will allow the computer to do a soft > > OFF procedure, where the computer boots down > > before turning off. > > > > Ideally, it would be 3-4 seconds push-to-hold > > to start the power-ON and boot-up sequence. And > > 3-4 seconds push-to-hold to bring up a "Do you really > > want to shutdown? YES/NO" prompt on the LCD screen, > > and after touching "YES" on the screen, the computer > > will boot down the OS, and shut down. > > > > However, if the boot down somehow hangs up, > > i'd like to retain the option of a "hard-turn-OFF", like > > almost all computers now have, where the ON/OFF > > button can be depressed for something like 5 seconds, > > and the computer will shut down immediately (no > > "soft" OFF boot down). > > > > If anyone out there has a schematic, > > that would be great. Thanks. > > > > > It's all done in software....
> > > Indeed it is. On my laptop sometimes the power button doesn't do anything because as you said it's software controlled, and rather buggy software under Windows. This necessitates the occasional pulling of the power cord and yanking out the battery in order to perform a true cold boot. | |||||||||||||||||||||||||||||||||||||||||||
>
> This may be a newbie question, but i'd like
> some schematics for the ON/OFF switch of your
> standard computer. In other words, a solid-state
> switch that will allow the computer to do a soft
> OFF procedure, where the computer boots down
> before turning off.
>
> Ideally, it would be 3-4 seconds push-to-hold
> to start the power-ON and boot-up sequence. And
> 3-4 seconds push-to-hold to bring up a "Do you really
> want to shutdown? YES/NO" prompt on the LCD screen,
> and after touching "YES" on the screen, the computer
> will boot down the OS, and shut down.
>
> However, if the boot down somehow hangs up,
> i'd like to retain the option of a "hard-turn-OFF", like
> almost all computers now have, where the ON/OFF
> button can be depressed for something like 5 seconds,
> and the computer will shut down immediately (no
> "soft" OFF boot down).
>
> If anyone out there has a schematic,
> that would be great. Thanks.
>
>