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Thread: I want to install a switch

  1. #1
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    I want to install a switch

    Hi guys

    Currently running a carputer system in my car. It's reasonably slow as it's fanless. Problem is if I start the car up and move for a short journey (like move the car out of the drive to let the girlfriend out and then park it up) it cut's the power to the computer while it's loading. This ends up mucking up the install and windows just loops and won't start.

    What I want to do is install a switch so I can put the computer on when I like.

    I've got one of these http://linitx.com/product_info.php?c...roducts_id=598 in at the moment wired to the ignition. I don't want to pull the car appart again to change this so is there a way I can install a switch onto one of these wires so I can turn the pc on when I want.

    Which wire would I install the switch on ? What type of switch would it be ? You get 2 types. One where you get on or off. Another where (I don't know the exact name) you switch it on for a second to close the connection but it switches straight off again. I guess the same as a normal pc switch ?

    cheers

  2. #2
    The Last Good Gremlin GizmoQ's Avatar
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    You might want to take a trip down to your local Electronics supply store (NOT RADIO SHACK, real electronics) and look for a 3-way SPDT switch that you can install between your ACC line and the M1-ATX. Install the switch on the ACC line going into the shutdown controller. I don't recommend using a momentary switch, I got mine specifically for my tablet but should work with a shutdown controller also. Just make sure the switch breaks the connection before making the next, i.e., completely isolates inputs.

    Mine has labels ON-OFF-AUTO and I have it wired to my power supply with constant 12V for on and ACC for auto. This switch allows me to keep the carputer on always (ON), leave it off always (OFF), or let the shutdown controller do its thing (AUTO).
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  3. #3
    Variable Bitrate ramy_zohair's Avatar
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    Final Touches

    Car: 2002 Mitsubishi Magna EI
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  4. #4
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    Quote Originally Posted by GizmoQ
    Mine has labels ON-OFF-AUTO and I have it wired to my power supply with constant 12V for on and ACC for auto. This switch allows me to keep the carputer on always (ON), leave it off always (OFF), or let the shutdown controller do its thing (AUTO).
    This is an excellent idea. Is this a function of all SPDT switches? This would be a great way to implement a valet type function. If you know you're going to be running the car for less than a minute or so, or don't want some valet mucking with your installation, just put it to off so the carpc never even powers up. If this isn't in the FAQ, it should be.

  5. #5
    Variable Bitrate ramy_zohair's Avatar
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    The only problem is i can't find a nice looking 3 way switch!

    Final Touches

    Car: 2002 Mitsubishi Magna EI
    CarPC: SP13000, M2-ATX, 512 MB RAM, 120 GB 2.5" HD, X-Fi Sound Card, Xenarc 700TSV, Garmin 18 USB.
    Audio: 2X15" Rockford Punch Z, 1 Rockford Punch 2-ch Amp, 1 Soundstream Lil Wonder II 4-ch Amp

  6. #6
    Constant Bitrate 01black_ac's Avatar
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    Would an SPST switch work for this, or does it have to be an SPDT switch? For my own car computer, I don't see the need to have an "always on" function, since that will be draining the battery. I'd rather just be able to control it as ON so that the Opus or M2-ATX (haven't decided which yet) controls the startup and shutdown, and OFF, so that I can prevent the computer from starting up at all if I'm just pulling the car out of the garage to wash it, or just going to get gas or smokes.

    I'm planning to wire my Opus or M2-ATX directly off the battery via a relay to the ignition, and would like to wire a manual switch in there as well. So will an SPST work, or does it have to be an SPDT switch? I guess I don't understand switches and relays enough to know the difference between SPST and SPDT in this kind of application.

    '01
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  7. #7
    Variable Bitrate ramy_zohair's Avatar
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    SPST will give you 2 options (either ALWAYS OFF or AUTO - opus or m1/m2-atx controlled).

    SPDT will give you 3 options (ALWAYS OFF, ALWAYS ON & AUTO) - its a three way switch.

    if you move the switch to the middle it is in OFF mode

    Final Touches

    Car: 2002 Mitsubishi Magna EI
    CarPC: SP13000, M2-ATX, 512 MB RAM, 120 GB 2.5" HD, X-Fi Sound Card, Xenarc 700TSV, Garmin 18 USB.
    Audio: 2X15" Rockford Punch Z, 1 Rockford Punch 2-ch Amp, 1 Soundstream Lil Wonder II 4-ch Amp

  8. #8
    Variable Bitrate ramy_zohair's Avatar
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    here is the best setup using a SPDT switch

    in 1) the power is switched according to the IGN line (and so startup/shutdown controller)
    in 2) the PC will always remain off, even if you move your key to IGN position
    in 3) the PC will remain always on, even if you pull your keys out, as the IGN is simulated by a +12V line.

    hope this helps
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    Final Touches

    Car: 2002 Mitsubishi Magna EI
    CarPC: SP13000, M2-ATX, 512 MB RAM, 120 GB 2.5" HD, X-Fi Sound Card, Xenarc 700TSV, Garmin 18 USB.
    Audio: 2X15" Rockford Punch Z, 1 Rockford Punch 2-ch Amp, 1 Soundstream Lil Wonder II 4-ch Amp

  9. #9
    Variable Bitrate
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    You realize that setting this switch to off wont cut the power to the Opus itself. If you are worried about battery drain, cutting power to the IGN wont do it. I have 2 switches in my car. One is up front and easy to reach which cuts the IGN line so I can take short trips without booting up. The other is more hidden and only gets used to completely kill power to the carputer. I flip that only when the system locks up and the Opus cant shut it down or when leaving town for a while and dont want the carputer trickle-draining my battery.

    Food for thought.
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  10. #10
    Constant Bitrate 01black_ac's Avatar
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    Thanks, that does help to make it more clear. I have a follow-up question... If I use an SPST switch, does it matter if the relay between the battery and the ignition switch is SPST or SPDT? I've found several relays in both configurations, and don't know which to use with an SPST switch.

    If an SPDT relay is okay, I'm considering this pair:
    http://www.allelectronics.com/cgi-bi...VE_RELAY_.html
    and
    http://www.allelectronics.com/cgi-bi...VE_RELAY_.html


    Here are some pretty nice SPST switches which I've been looking at:

    http://www.frozencpu.com/scan/se=Ele...nu_search.html

    And this one specifically:

    http://www.frozencpu.com/ele-138.html?id=bckv3xZy

    Might be nice to mount it inside a lockable console, or even somewhere on the dash, depending on how bright the LED actually is.

    '01
    Hang on while I defragment my car...

    the Acura ITX project
    the Acura ITX skin for RoadRunner
    project progress: 99%

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