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  • carnetix and laptop

    I recently aquired a compaq e500 laptop, and have decided to use it in the car. After searching, I am pretty sure how to power it in car with the carnetix p1900, but just want to confirm my ideas here.

    In order for it to work, I just need to get a tip that fits into the laptop power supply splice that into the wires off the carnetix, and then select the correct voltage for the laptop, correct? Or am I way off base here?

  • #2
    that's the begining, but then you need to have a way to tell the carnetix that the pc is on, & you need to acess the pwr switch of the laptop, so the carnetix can start & shut it down...
    MY NEWEST INSTALL:modded infiniti fx with big screen

    first windows carpc install........my liquid cooled LVDS screen :D

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    • #3
      You also need to make sure the laptop power connector is just a ground and voltage...a lot of new ones have a third (or more) pins that tell the laptop if you're using a original power brick and won't charge if you aren't.

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      • #4
        yeah, newer dells are bad with that... some compaqs too I think, if theres 3 connections instead of 2, you may have an issue there...
        MY NEWEST INSTALL:modded infiniti fx with big screen

        first windows carpc install........my liquid cooled LVDS screen :D

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        • #5
          Actually, if you are connecting the Carnetix PS to a laptop, you should be able to configure the Power Management properties of Windows to hibernate when external power is removed. (You would then be powering off the batteries of the laptop for the duration of the shutdown period.) Of course, the laptop wouldn't come back on automatically when power is restored, unless you have some sort of ACPI function in your BIOS to 'Turn on when power is restored'. This would be much easier than trying to connect an ACPI interface from the PSU to your laptop.

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          • #6
            not to threadjack, but if he has one of those newer disctiminating power plugs, how does one get around that hurdle?
            Current Rig
            ----------
            Inspiron 5100 Laptop
            *2.2 Ghz CPU
            *368 MB Ram
            *32meg OnBoard Vid
            Carnetix 1900 PSU
            BU-353 GPS Antenna
            iGuidence Nav Software / Mappoint for POI's
            Linksys USB WiFi
            D-Link USB Bluetooth 2.0
            Xenarc 700IDT
            Eclipse CD4000 HU

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            • #7
              best way really is to use a car adaptor made for the laptop, like a lind or something... it's not that no car adaptor works, they do have one that will work with it, just has to be the right one...

              I did a dell once... they use 3 pins... one ground, one 12v & one 19v, all from the same supply, but the laptop runs on the 19v alone no problem, just doesn't charge the battery.... I never tried giving it both voltages, but assumed it would work, but complicate it... I don't use batteries most times anyway, & if everything is wired correctly, you don't need the battery at all...

              as far as setting up windows to hibernate as power is lost, that defeats the purpose of using a startup/shutdown controller in the first place... not only that, but for the power supply to even work, it does need to know weather the computer is on or of, otherwise it'll keep sending out a pulse to attempt to start it for the whole duration it's on!!.... it's not hard to do this interface at all... I did a thread once, it was an opus, but same thing really...
              MY NEWEST INSTALL:modded infiniti fx with big screen

              first windows carpc install........my liquid cooled LVDS screen :D

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              • #8
                Does the P1900 have a startup/shutdown controller? I was thinking it was just a regulated PS with no fancy features. I have a dell inspiron 2200 and I plan on getting a motorized touchscreen and was going to power them from a P1900.

                I was thinking it would work just as the original poster suggested. Now I'm kind of worried.
                My carputer project

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                • #9
                  it does have a startup/shutdown controller. the biggest problem could be charging the battery I guess... do your research really, check for 3 connections or 2... the third is hard to notice but it's sometimes the inner part of the outer hole...
                  MY NEWEST INSTALL:modded infiniti fx with big screen

                  first windows carpc install........my liquid cooled LVDS screen :D

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                  • #10
                    As far as I can find out, it is a 2 pin connection for the laptop, so I should be good to go.

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                    • #11
                      Originally posted by turbocad6 View Post
                      that's the begining, but then you need to have a way to tell the carnetix that the pc is on, & you need to acess the pwr switch of the laptop, so the carnetix can start & shut it down...
                      Other than soldering the power switch, how do you get the Carnetix to talk to the laptop? Do you have to open the laptop up and solder?
                      Hardware: [-------- ]30%
                      Software: [----- ]20%
                      Install:[------- ]70%
                      2005 Subaru WRX - New 1.83 GHz Mac Mini - OSX/parallels is my front end - K301 InDash monitor

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                      • #12
                        check the thread I linked in post 7... it explains the 2 things necissary... the power switch & the necissary circuit for telling the power supply when the pc is on...
                        MY NEWEST INSTALL:modded infiniti fx with big screen

                        first windows carpc install........my liquid cooled LVDS screen :D

                        Comment

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