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Can I hook an alarm auxiliary output to my computer to turn it on?

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  • Can I hook an alarm auxiliary output to my computer to turn it on?

    I have 2 auxiliary outputs on my Compustar 2W8000FMR alarm brain and I want to know if I can hook them up to turn on my computer when I hit the button on my keyfob. Would they put out too much voltage (milliamps or whatever) to fry the board? What if I hooked it to the M1-ATX which would regulate the power? Would I just splice into the regular switched wire going into the M1-ATX now? Would the signal be powerful enough?
    Ampie Case
    2.5" Hard Drive 80GB Samsung 5400RPM
    256 MB DDR2 PC5400
    Xenarc 700TSV - VGA Monitor
    Intel D945GCLF Motherboard
    M2-ATX-HV

    2005 Honda Civic

  • #2
    use the output to contact a relay that would power the acc+ on the m1atx. never hook those outputs to anything but a small automotive relay.

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    • #3
      Which size relay?

      Or what if I hook it to the switched line on the M1-ATX? That would regulate it.
      Ampie Case
      2.5" Hard Drive 80GB Samsung 5400RPM
      256 MB DDR2 PC5400
      Xenarc 700TSV - VGA Monitor
      Intel D945GCLF Motherboard
      M2-ATX-HV

      2005 Honda Civic

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      • #4
        just a regular automotive relay. the coil is 200 milliamps. go to ur local autosupply and ask for a relay. and all you need to do is supply power to the acc input on the m1-atx

        ground 1 side of the coil
        the aux from the alarm goes to the other side of the coil
        the common goes to constant +12
        normally open goes to the acc+ on the m1-atx

        you dont need to regulate anything. both the relay and the acc on the m1-atx are designed to accept dirty power

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        • #5
          oh and if when you hook this up it turns on all of the acc in the car and not just the computer, diode isolate it

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          • #6
            Does the computer require constant power on the ACC or just a single pulse? This is just going to send a short signal on the line and then I'm assuming hitting the button again will turn the computer off? I don't think will work because as soon as I turn the car off and the ACC line isn't powered anymore, the computer turns off.
            Ampie Case
            2.5" Hard Drive 80GB Samsung 5400RPM
            256 MB DDR2 PC5400
            Xenarc 700TSV - VGA Monitor
            Intel D945GCLF Motherboard
            M2-ATX-HV

            2005 Honda Civic

            Comment


            • #7
              Originally posted by Maheriano View Post
              Does the computer require constant power on the ACC or just a single pulse? This is just going to send a short signal on the line and then I'm assuming hitting the button again will turn the computer off? I don't think will work because as soon as I turn the car off and the ACC line isn't powered anymore, the computer turns off.
              The alarm output that I chose is constant...you should find the output on your alarm that is also constant. If it has aux output function, then surely it's constant. Usually the only time an alarm pulses an output is when it's a verification output.

              Tap into the ACC wire where you have the ACC output coming out of the harness (i.e. near the alarm). You MUST put a diode on the ACC wire upstream of the tap, or you will energize the ACC in the whole car...

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              • #8
                yeah so on your remote if you turn the acc on it turns on the output, and pressing it again, turns it off. is not just a pulse each time. truuuust us, it will work

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                • #9
                  Cool, going to get a length of wire and try this out once the car comes back from the body shop.
                  Ampie Case
                  2.5" Hard Drive 80GB Samsung 5400RPM
                  256 MB DDR2 PC5400
                  Xenarc 700TSV - VGA Monitor
                  Intel D945GCLF Motherboard
                  M2-ATX-HV

                  2005 Honda Civic

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