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Thread: Laptop OR Desktop?

  1. #16
    FLAC djmickyg's Avatar
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    here is a pic
    hope the attachment works

  2. #17
    FLAC djmickyg's Avatar
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    EDIT : sorry me agian.. just thinking about the diagram i just posted.. have the power wire trigger the 2nd relay wouldnt work.. that relay would have to be triggered by another power wire in the Latop..
    something like the power wire to the flopy disk drive.. something that isnt really used but has power going to it when the laptop is switched on.

  3. #18
    FreeDrive Creator CdRsKuLL's Avatar
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    unsure how much power we would be talking about, but say you got a 3v or 4v relay. It wouldnt have to be much at all, as its only going to be used to open / close a switch.. this could be powered off a usb port. This would then solve the problem..



    What do you think ?

    using two relays, one 12v the other 5v like these

    I dont know two much about electronics, what would the effect be of sticking the 5v relay across the + and - on the usb ?

  4. #19
    FreeDrive Creator CdRsKuLL's Avatar
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    the more I think about it, the better it sounds, been reading up on hibernation.. it seems a laptop is good for about 2 weeks. The boot time is less than 10 seconds on this dell latitude I have here. Also you could set it to turn off into hibernation after say 30 mins when running on battery. This would solve the short stops issue. :-) Also for most laptops you can by a 12v light adapter, this would then be DC-DC and would solve any noise generated by a inverter. As i'm running a wifi lan, when the car is outside, I could alter the running on battery to around 2 hours, this would then enable me to remote in and do anywork needed without have to keep the keys in the car.

    As no screen would be needed the battery life would be good.. The only thing that does concern me, is the charge time on the laptop.. the charge time would have to be less than the discharge time. Otherwise you would find the computer not lasting 30 mins before hybernation.. you can set it up so when your battery is very low it auto puts it into hibernation anyway. This would have to be a trial thing really. A long drive would charge it up, but if your just nipping round to the shops this wouldnt be enough..

    On the older dell laptops theres only 1 usb port, but you can pick up small docking stations cheap on ebay, and at local computer fairs, these contain 2 usb ports at the back and also a power button to turn it on, this would then save you opening the laptop. These are also powered by the standard laptop psu. I will do some more research on this, might even build the relay power thing and test it out.

  5. #20
    FLAC djmickyg's Avatar
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    Quote Originally Posted by CdRsKuLL
    I dont know two much about electronics, what would the effect be of sticking the 5v relay across the + and - on the usb ?
    i been thinking about where to trigger the other realy from.. from the usb would be alright but i dont think i would be touching that wire.. most older laptops only have one usb and if u short it out then u aint got no usb at all..

    i was thinking of using the wires that power up the led on light..
    having a power wire with just the realy on it could cause problems as u would have to put in a resistor to pull some extra load, and thats hi tech stuff

    putting the relay on a circuit that already has things connected in it seem better.. (im no expet, i'm just guessing) the realy would only pull a few extra mA from b4 the LED wich only will pull 300mA..


    EDIT: whats about if u wana shut down the pc while the car is on? would it allow u?
    if the power insde the laptop stops when u shut it down then relay 2 will switch and trigger relay 1 agian and the laptop will switch back on? i think?

  6. #21
    FLAC djmickyg's Avatar
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    Quote Originally Posted by CdRsKuLL
    The only thing that does concern me, is the charge time on the laptop.. the charge time would have to be less than the discharge time. Otherwise you would find the computer not lasting 30 mins before hybernation.. you can set it up so when your battery is very low it auto puts it into hibernation anyway..
    this could be a problem..
    i drive 1/2 hour to work and 1/2 hour from work every day so i think that would be amples of power to charge the battery,, even for the w/e short trips.. but if u were doing short trips all day u might have to fully shut down the laptop and not have it suckin juice in hibernation mode?
    but like u say.. its all trial and error.. who knows whats gonna happen

  7. #22
    FreeDrive Creator CdRsKuLL's Avatar
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    yeah your right, it would turn back on. you would need to put a switch in relay 1 to stop it turning back on. But I would of thought this not allowing to turn off would only be a good thing. I'm going to get some bits tomorrow to make the relay power thing.. going to try usb first... its a v.old laptop and already doesnt have a screen, so not much to loose.

  8. #23
    FLAC djmickyg's Avatar
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    you could just put a switch on the ACC line b4 all the realys,, and mount it under the dash somewhere up front.. so if u had to turn the laptop off u could flick the switch then shut it down..
    and then if the ignition is still on and u flick the switch back then it would all boot up agian..


    if i was to have a pc in my car would be on most times when i drive anyways.. so its not that important.. but its good know u can turn it off if u wanted too..

    i gotta start search for an old cheep laptop. start building up a collection of things to one day put in my car..

  9. #24
    FreeDrive Creator CdRsKuLL's Avatar
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    quite afew about with broken screens.. just a case of asking about, as no one thinks people would be interested in something broken so dont advertise. try here something like that would do I think :-)

  10. #25
    FLAC djmickyg's Avatar
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    well i managed to get a hold of one..
    its a toshiba with a celeron 633.. has a broken screen
    all it needs is a H/D..

    now all i need is all the other things ie. screen ect
    and a new car to put it in which im searching for ATM

  11. #26
    FreeDrive Creator CdRsKuLL's Avatar
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    on some toshiba's the cpu is in a socket, I would of thought if it is, then you could upgrade this to a PIII 1.2 .. I'm assuming its using sdram 133.

  12. #27
    Constant Bitrate NotchbackVW's Avatar
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    Quote Originally Posted by CdRsKuLL
    unsure how much power we would be talking about, but say you got a 3v or 4v relay. It wouldnt have to be much at all, as its only going to be used to open / close a switch.. this could be powered off a usb port. This would then solve the problem..



    What do you think ?

    using two relays, one 12v the other 5v like these

    I dont know two much about electronics, what would the effect be of sticking the 5v relay across the + and - on the usb ?
    In my thread below is a detailed description of how i plan to turn my pc and inverter of using only basic relays linked up to the central locking lines on my alarm module. See what you think, no one else commented on this design yet.

    How2 control CarPC from key fob....

  13. #28
    FreeDrive Creator CdRsKuLL's Avatar
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    had a look at your thread.. looks like you have put loads of time into thinking about that. great idea about using the relays so it powers down itself. I'm after one that enables it to go into hibernation for 10 mins or something. I might even go for the opus..

  14. #29
    FreeDrive Creator CdRsKuLL's Avatar
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    ok been thinking.. you can get a result by a single relay



    when power is connected.. the laptop has already got its power button pushed down, so it will start, as soon as the motherboard has a 5v live (meaning laptop is now powered on) the relay closes the power button. Its now not possible to turn the laptop off, if you try it will just restart. You could then set the laptop to turn off or hibernate after 10 mins.. when running on batterys, as no dc power is then supplied it will only start when you start your car..

    you could quite easy stick a switch in the motherboard pin side of the relay, this then could enable you to just shut the pc down without it restarting.

    I have a 5v relay here.. and as its small can be mounted inside the docking station, making it a clean install

    what do you think ?

  15. #30
    Raw Wave god_of_cpu's Avatar
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    Well on my laptop I forgot to mention I found there was actually two sets of pins. For one set, if you connected a regular SPST Relay to it would trigger the laptop to go on and wouldn't shut off if it was held down. For the other set of 2 pins the laptop would turn on if pressed and turn off if held down for more then 4 seconds this was what the regular power switch was connected to. The laptop was a dell inspiron 3200.

    To do what you want just go to this page and check out the relay used for "constant to momentary output".


    Quote Originally Posted by CdRsKuLL
    on the above diagram, the relay would emulate the power button being held down all the time, whilst this would be ok to turn it on, say you call in for Gas (petrol) then when you return to the car (notebook still running on battery) you start the car, the power button would be pushed, turning the notebook off.. as it would be held down for more than 4 sec's... anyone got a idea how you would just have the button pressed for say 0.5 secs or something ?
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