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Thread: psuedo start up controller, help :)

  1. #1
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    psuedo start up controller, help :)

    ok... this may need to be moved to power supplies but we'll see...

    First let me say what hardware I have:
    -Dell Inspiron 8000 Laptop (850Mhz pIII, 256ram, 40g, dvd, sans lcd... picked it up cheap on ebay)
    -7" in dash touch lcd (well, will have as soon as DigitalWW sells em)
    -JVC Kameleon LX-50 head unit (aux input)
    -Power will be supplied by a dell car adaptor unit.... its really just a regulated dc -> dc supply so no biggie here I've got everything powered up and it works fine.

    Ok, here is how I would like the system to work I've got the "basics" covered but need a little help designing the circut... I know it won't be complex but still need a little help

    Basically I want a relay that sits on the remote ("amp") on line from the head unit that when powered turns on the 12v to the DC adaptor for the laptop and somehow activates a momentary switch to turn on the laptop. Then when the car (or head unit) is turned off the relay will disengage and the dc adaptor will turn off.
    ----------- already have this party done -----------
    then when the laptop goes from "DC" to battery power it will auto hibernate after 20 min of battery power.


    I know the relay for the dc adaptor will be easy... I think the only hard part will be getting it to somehow activate a momentary switch or I can hard wire the switch and somehow just have something complete the circut for a minimal amount of time... I don't know really thats why I'm looking for help...

    thanks!
    -- WireSix, Inc. --
    MP3Car Lives Here!

  2. #2
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    *bump*
    -- WireSix, Inc. --
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  3. #3
    Variable Bitrate mp3hombre's Avatar
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    Give this a try:

    When you apply 12v, the capacitor "acts" like a short, bypassing the resistor and energizing the relay. The C and NO contacts will be on for a time determined by the resistor/capacitor values. When the capacitor is fully charged, the relay will be turned off (even with power applied to it).
    This resistor/capacitor combination will give you approx. 1/2 second. Increase the capacitor value to increase the on time.
    When you remove power, the cap will discharged through the resistor.
    The capacitor should be rated at min. 25 volts.


  4. #4
    Maximum Bitrate none's Avatar
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    Can somebody please repost this circuit? It seems to have disappeared and I need it!


    Quote Originally Posted by mp3hombre
    Give this a try:

    When you apply 12v, the capacitor "acts" like a short, bypassing the resistor and energizing the relay. The C and NO contacts will be on for a time determined by the resistor/capacitor values. When the capacitor is fully charged, the relay will be turned off (even with power applied to it).
    This resistor/capacitor combination will give you approx. 1/2 second. Increase the capacitor value to increase the on time.
    When you remove power, the cap will discharged through the resistor.
    The capacitor should be rated at min. 25 volts.


  5. #5
    FLAC Pudge's Avatar
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    bump

  6. #6
    Newbie z28control's Avatar
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    If you want to use something simple and pre-packaged, for ~$40(US) this might be a good solution.

    PTR-7

    It seems to have a lot of flexibility for custom ON/Off, timed, and pulse functions. Option 12 is probably your best bet. (Table in the .pdf file)

    Possible sources:

    One

    Two
    ------------------------------------------------------
    Car PC - If you have to ask why, you'll never understand.
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  7. #7
    Low Bitrate
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    Here's the stupid question, i have a Dell Inspiron too but a 2500... How do you get the laptop to turn on without opening the laptop and pushing the power button? On my bookpc i had a option of resume on AC loss but on the laptop i don't have that function... ANy suggestions?

    It seems to have a lot of flexibility for custom ON/Off, timed, and pulse functions. Option 12 is probably your best bet. (Table in the .pdf file)

    Possible sources:

    One

    Two[/QUOTE]
    1997 Mazda 626 ES [Cronos] - 2.5L V6

    http://www.cardomain.com/id/hmany2k

  8. #8
    Constant Bitrate
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    Anyone have anything on their laptops called wake on ring? I have it on my laptop. It looks at the RI line of the serial port. You provide 12v to it and the computer powers up. Take a look in your bios for it. If you have it let me know and I'll help you figure it all out.

    Tom
    1993 Probe GT
    Rio Car w/20gb

  9. #9
    Low Bitrate
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    Nope can't say i have that either... Any other suggestions =(

    Quote Originally Posted by tbdombrosky
    Anyone have anything on their laptops called wake on ring? I have it on my laptop. It looks at the RI line of the serial port. You provide 12v to it and the computer powers up. Take a look in your bios for it. If you have it let me know and I'll help you figure it all out.

    Tom
    1997 Mazda 626 ES [Cronos] - 2.5L V6

    http://www.cardomain.com/id/hmany2k

  10. #10
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    Here's my $0.02. I've got an old laptop installed in the dash that I semi-permanently have the power button fastened in the down position. This allows it to power up when power is applied to the dc-dc car adapter and power down when the power is cut.

    Some laptop power supplies will reset if the power button is held down...luckily mine doesn't...otherwise this literally $0.10 idea would not work.

    I running win98se with the scandisk off and with a couple hundred ungraceful shutdowns it has yet to corrupt.

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