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  • power switch circuit help (on/off/auto modes)

    all,

    i'd like to mount a switch in my dash that controls my carputer. i'd like it to have 3 modes, auto, on and off. i'm using an m2-atx power supply.

    the behavior i would like is as follows:

    on - IGN lead of M2 connected to battery, computer is on even when the car is off
    off - IGN lead of M2 grounded, computer is off even when the car is on
    auto - IGN lead of M2 connected to IGN of car, computer is on iff the car is on

    i have a 3-way switch that is on-off-on. my plan is to wire one "on" pole to the battery, one "on" pole to an ignition switched 12v source and the "off" pole to the IGN lead of the M2 with a pull-down resistor in parallel.

    Code:
    
    
             ON  OFF AUTO
    BATT ----o    o    o----- IGN
              \
               \ 
                \       20K
      M2-ATX o---o---\/\/\/\---> GND
         IGN      
    
    
    will this circuit work?

    secondly, am i correct in assuming that the M2's shutdown delay will prevent the computer from shutting down as i switch from ON to AUTO or vice versa?
    2006 Corolla S Ex-Audio 7" Epia MII ATI AIW VE 512MB Mini-Box.com M300 Case 100GB 2.5" HDD Z-COM XI-325HP+ Linksys WSB24/WRT54G w DD-WRT Treo 755p BT Modem Lite-On Slotload DVD GPS JVC AVX2 2x JL Audio 8" Alpine Type-S F/R

  • #2
    the ACC wire in M2 control its auto. disconnect it makes it manual. in Manual you need a manual switch (connect to your mobo) to turn on/off pc.
    My postinghttp://www.mp3car.com/vbulletin/showthread.php?t=90051

    Comment


    • #3
      but in answer to your question, the setup you're talking about is EXACTLY as I have it in mine...minus the 12v psu...

      Got that 3way switch on my dash for times when I need to turn the car off for a couple seconds (if the van's engine dies & needs to be restarted for instance, I don't have to cycle the puter).

      Comment


      • #4
        Yes, your circuit will work, but I don't believe that it is necessary to ground (or pull to ground) the M2's IGN wire. Simply leaving this wire open for "OFF" mode should do the trick. (If you know something that I don't, please let me know because I am planning on doing this as well). And yes, the delay of the M2 will allow you to switch from "ON" to "AUTO" without the PC shutting down.
        ** Denotes an "in car" post
        In-Car posts made from passenger seat - Be safe, Don't Post and Drive.

        Comment


        • #5
          it may not be necessary but it seems like in general leaving an input floating is a bad idea just from an engineering perspective. does anyone know for sure what the M2 does when that lead is floating?
          2006 Corolla S Ex-Audio 7" Epia MII ATI AIW VE 512MB Mini-Box.com M300 Case 100GB 2.5" HDD Z-COM XI-325HP+ Linksys WSB24/WRT54G w DD-WRT Treo 755p BT Modem Lite-On Slotload DVD GPS JVC AVX2 2x JL Audio 8" Alpine Type-S F/R

          Comment


          • #6
            Just get a ON-OFF-ON 3 pin toggle switch.
            Pin 1 connect to battery
            Pin 2 connect to the M2 ACC wire
            Pin 3 connect to the car's IGN or ACC source.

            Operation:
            First ON, PC will be on untill the battery flat
            OFF, well, it off regardless of car's status
            2nd ON, PC on with the iGN key.

            No extra component needed.
            2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
            89 Supra Turbo P3 [email protected]/Abit BE6 II, Alpine M-BUS Car2PC.
            Y2K Accord Dell GX150
            RoadRunner is the best FE PERIOD
            EmoRebellion is a SCAMMER

            Comment


            • #7
              Attached Files
              HARDWARE: Fujitsu Stylistic ST5111w/WiFi and dock, internal Hitachi 500G HD, external 1TB HD, Sierra Wireless Aircard 550, DVD-RW, BoomzBox HD radio, XM Commander, Delorme GPS, Saitek X-52 Pro joystick, BluSoleil Bluetooth, TPMS, FB, Elm327

              Comment


              • #8
                jigger -

                i use an on-off-on switch. wired it just like MatrixPC recommended. when the switch is in the down position, the computer reacts to the ACC line. when the switch is in the up position, the computer is on. when the switch is in the middle position, the switch is off.

                it works great.

                - O
                2004 Toyota 4Runner Sport 4WD
                Opus 90W, Epia M210K, Lilli 7" TS, 30GB, CDR/DVD Slot, PowerMate, Earthmate, 200GB Seagate 3.5", Verizon BroadbandAccess, CentraFuse, Valetine1 .....

                Comment


                • #9
                  I have the exact same installation .. on-off-on switch!

                  the m2-atx handles it just fine! you don't really need to ground the "off state
                  VIA EN15000 C7 // CTF700 7" Screen // Morex 3688 Black Case
                  M2-ATX // 80GB HD
                  DVD-RW // PowerMate
                  Belkin Bluetooth V1.2 // Hauppauge WinTV FM

                  Centrafuse RC5

                  JBL GTO 75.4 520W // Pionneer Kevlar 260w Speakers

                  Comment


                  • #10
                    Anybody care to post a diagram, please.
                    ****************************************
                    OLD SYSTEM (DEAD)
                    Intel D945GCLF2 Dual Core ATOM
                    Lilliput 7" 629GL 2008 LED Backlight
                    BU-353 USB GPS Receiver / iGuidance / IGO8
                    M2-ATX Power Supply
                    RideRunner Front End / Various Skins
                    Windows XP SP3

                    Comment


                    • #11
                      Oh man, you still need a diagram?
                      Okay borrow and mod base on OP
                      Code:
                               ON  OFF AUTO/ON
                      BATT ----o    o    o----- Car's ACC/IGN
                                    |
                                    |
                                    |
                                PSU ACC/IGN Input
                      2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
                      89 Supra Turbo P3 [email protected]/Abit BE6 II, Alpine M-BUS Car2PC.
                      Y2K Accord Dell GX150
                      RoadRunner is the best FE PERIOD
                      EmoRebellion is a SCAMMER

                      Comment


                      • #12
                        For some reason i couldn't visualize it (i don't have my M2-ATX handy).

                        Thanks for taking the time to reply.
                        ****************************************
                        OLD SYSTEM (DEAD)
                        Intel D945GCLF2 Dual Core ATOM
                        Lilliput 7" 629GL 2008 LED Backlight
                        BU-353 USB GPS Receiver / iGuidance / IGO8
                        M2-ATX Power Supply
                        RideRunner Front End / Various Skins
                        Windows XP SP3

                        Comment


                        • #13
                          thanks everyone.
                          2006 Corolla S Ex-Audio 7" Epia MII ATI AIW VE 512MB Mini-Box.com M300 Case 100GB 2.5" HDD Z-COM XI-325HP+ Linksys WSB24/WRT54G w DD-WRT Treo 755p BT Modem Lite-On Slotload DVD GPS JVC AVX2 2x JL Audio 8" Alpine Type-S F/R

                          Comment


                          • #14
                            Originally posted by GizmoQ View Post
                            where did you get this switch from or did you print on it yourself?
                            2003 Steel Blue PT Cruiser GT Autostick, Mopar BOV, K&N FIPK, Dual Exhaust, Boost Gauge.
                            ICE: 2 12" Infinity 1230W, JBL BP1200.1, Infinity 6000CS, JBL P80.4, Sirius Starmate.
                            http://www.cardomain.com/ride/2314583

                            Comment


                            • #15
                              Originally posted by Mike12086 View Post
                              where did you get this switch from or did you print on it yourself?
                              I just lucked up on it preprinted like that at my local electronic surplus store. Tried to get them to find one exactly like it with illuminated lettering but we couldn't find anything close.
                              HARDWARE: Fujitsu Stylistic ST5111w/WiFi and dock, internal Hitachi 500G HD, external 1TB HD, Sierra Wireless Aircard 550, DVD-RW, BoomzBox HD radio, XM Commander, Delorme GPS, Saitek X-52 Pro joystick, BluSoleil Bluetooth, TPMS, FB, Elm327

                              Comment

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