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  • Laptop Users - Shutdown Control

    I was wondering what people who use laptops do for shutdown control. The old laptop I was using has very little APM control so it may well be useless anyway. I was however thinking of starting on a little utility which waits for the computer to switch to battery power then start counting down. After x minutes on battery it would shutdown or suspend.

    Do you laptops users think this is worthwhile or are the newer laptops adept enough to do it for you?

    I think a "Don't shutdown I'm just stopping for has" option and so on would be natural extensions to this.

    The attached file just monitors for power / battery, nothing too exciting, just using it to test if the app can tell on a given laptop.

    Chris.
    Attached Files

  • #2
    you already have this option in the power settings, you can just set it to turn off / standby / hibernate after a set time when running on batterys. The main problem is pressing the power button to turn the unit on when you turn your key

    CdR
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    • #3
      Surely if you rewire the power button to a relay its possible to do direct from the ignition wiring.

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      • #4
        It seems most laptops rely on the battery running low to shutdown though, I want to shutdown after x minutes on battery as a way of getting by cranking etc. I don't think this would be a regular power setting as it isn't really how laptops are intended to be used. It can shutdown after being idel too, but if you use an idel timer then you may want to override it.

        I guess it all depends on just how much a particular laptop offers, and trying it for real to see how well it works out. Thanks for the comments.

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        • #5
          Originally posted by UK_MP3Car
          Surely if you rewire the power button to a relay its possible to do direct from the ignition wiring.
          Yeah this would work to power it on no probs.. the problem would be if that the laptop was already on, say when u stop for fuel and its still running on batterys, then when you start the car.. button presses, but its not a pulse, its a constant press > 4 sec's just turns the laptop off.
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          • #6
            Ahh right, yeah .... never thought of that!!!

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            • #7
              Originally posted by ukchris
              It seems most laptops rely on the battery running low to shutdown though, I want to shutdown after x minutes on battery as a way of getting by cranking etc. I don't think this would be a regular power setting as it isn't really how laptops are intended to be used. It can shutdown after being idel too, but if you use an idel timer then you may want to override it.

              I guess it all depends on just how much a particular laptop offers, and trying it for real to see how well it works out. Thanks for the comments.
              Well on the dell laptops, if you goto display properties, then screen saver you have a extra box.. monitor power here you can set your laptop to turn off / standby / hibernate after a set number of minutes once its running on batterys, this is of course if no keypress / screen tap is recieved, which if your outside your car it wont :-) I used it on my first carputer, and intend to use it on the next one

              Cheers

              CdR
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              • #8
                Thanks, good call, I think that would do it in most cases. The only exception might be a manual overide but you're right, that handles probably 95% of situations. We have some Dells with roken screens somewhere, will look in to it.

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                • #9
                  Here's how I'll be solving this problem: http://www.mpegbox.net/microsdc/
                  My install log
                  My "selling entire system" thread

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                  • #10
                    yeah all you would need is a simple circuit to send a press for 0.5 sec. If the laptop is turned off , then this would turn it on. You need to set xp up to ignore any button press, this is in power option in control panel. So if its turned on, a 0.5s button press wouldnt do anything. If someone could draw up a quick circuit that could send a 0.5 sec closed circuit then this would be great. I have already soldered wires to my power on button of my laptop, ready for a relay to close the circuit, I just aint bright enough to do the 0.5 press. maybe a cap will be needed and a couple of diodes, but thats about as far as my knowledge goes. Of course the power unit would be connected to power that turns off when you take the keys out. anyone draw up a quick diagram ?

                    CdR
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                    • #11
                      Originally posted by Hark
                      Here's how I'll be solving this problem: http://www.mpegbox.net/microsdc/
                      yeah this would do the job, but its alittle bit overboard for what I need. I only need a button press, I already have a psu unit that plugs into the 12v lighter socket, so dont need the power regulated and this power to this psu would be turned off when I take the keys out, so no chance of draining the battery. Just wish I listerned more in class as school.. but in them days the only thing I did was a multi-vibrator. hmm was that what it was called ?

                      CdR
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                      • #12
                        how about just relocating the pwr switch to your dash? Then setup in XP to prompt you for choices when that button is pressed.... it would be a perfect world if it just worked off of telpathy... lol
                        http://www.realcoatings.com/pictures/raspy2.jpg

                        For the BLING, gimme a RING

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                        • #13
                          Originally posted by CdRsKuLL
                          yeah all you would need is a simple circuit to send a press for 0.5 sec. If the laptop is turned off , then this would turn it on. You need to set xp up to ignore any button press, this is in power option in control panel. So if its turned on, a 0.5s button press wouldnt do anything. If someone could draw up a quick circuit that could send a 0.5 sec closed circuit then this would be great. I have already soldered wires to my power on button of my laptop, ready for a relay to close the circuit, I just aint bright enough to do the 0.5 press. maybe a cap will be needed and a couple of diodes, but thats about as far as my knowledge goes. Of course the power unit would be connected to power that turns off when you take the keys out. anyone draw up a quick diagram ?

                          CdR

                          It has been posted here in the past..

                          Anyway: something like this:



                          Note: i'm not sure if this is all required, it works, but additional diodes might be needed eg on the relay coil.

                          When powering on, the capacitor charges, and during charge, the relay switches on. When the capacitor is charged, the relay drops off. Depending on the used relay and capacitor the time can be adjusted. The 1k resistor on the capacitor is used to to decharge the capacitor.

                          Just search here, there is a topic about this, but I can't find it atm
                          My Opel Astra 1993 CarPC: http://www.djsmiley.com/projects/carpc/photos/

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                          • #14
                            ok.. kewl Yep Think I understand whats going on :-) wouldnt you need a diode inbetween r1 and k1 to stop it making a circuit with the relay ? Am I right in thinking that you would still have a flow of electric even with the cap full ?

                            CdR
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                            • #15
                              Originally posted by CdRsKuLL
                              Well on the dell laptops, if you goto display properties, then screen saver you have a extra box.. monitor power here you can set your laptop to turn off / standby / hibernate after a set number of minutes once its running on batterys, this is of course if no keypress / screen tap is recieved, which if your outside your car it wont :-) I used it on my first carputer, and intend to use it on the next one

                              Cheers

                              CdR

                              the problem with that is some front ends will prevent the screen saver from launching (ie FrodoPlayer). Therefore, if the laptop were to go to battery power, it would run till the battery discharged since the front end stops the screen saver from ever loading.
                              Mercedes Benz CLK 430

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