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  • novice M2-ATX question

    Hello folks,

    so come to find out i'm not near as bright as i thought, and not near as handy as i'd figured..

    I've got through and read and read and read and have learn a ton of info on here. if you dig enough you can find it, i think.....
    so here's my novice question.

    I've run a 12 gauge wire with an inline fuse to a rocker switch. from the rocker switch to J1 of the m2.
    I've ran the ground to J4 and found me a open fuse slot that gets 12v power only when i turn the ignition on this is ran to the J3
    I have an 8" lilliput that i spliced the car adapter plug to the 4pin P4 style connector

    and i have yet to run the j8/j9 to the motherboard in all honesty cause i have no idea where to run it, I have the VIA ARTiGO A1000 Barebone Pico-ITX Builder Kit. Went the cheap small route this time around just cause i wasn't sure if i could actually build one AND get it to run in my car. I'll search more on that later.

    The question is. .if my lilliput is plugged into the 4pin. shouldn't i at least be able to power on the ts? is there something else on this m2 that i don't know about?
    If anyone needs pics let me know.
    Thanks in advance.

    Enraiha

  • #2
    Yes you should be able to if you fool it into thinking the PC is on.

    The M2 doesnt just give out power when the car is on, it tells the mobo that the car is on, you should be too. Then the mobo decides whether or not to turn on (via J8). This should be connected to your power button header btw. When the mobo turns on, it grounds pin 14 of the ATX connector (that big 20pin cable). This tells the M2 to start cranking and as long as pin 14 is grounded (to any black cable on there if your cable is standard, but double check first) then you will get all the correct voltages out. Once 14 is disconnected, those rails will disconnect. Also once the car is off, and the hardoff period is over on the M2, those rails will disconnect (like pulling the plug from the wall).
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    • #3
      wow, awesome. thanks..i think i can make it happen. thanks sooo much!
      now i just gotta figure out where the power header button ....

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      • #4
        anyone know where i'm suppose to plug the j8/j9 on the pico itx mobo?Click image for larger version

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        • #5
          I pulled up that manual you're looking at and it refers to a case connector (Pin 6, PW_BN). It should be the header I boxed off in red.
          Attached Files

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          • #6
            thanks found that as well. i figured the six, for the pwr on and the 8 for the ground for the j8 right? that's what i managed to accomplish today but didn't seem to work. Will have to do a bit more research tonight while at work and won't be able to get back to it til next monday so i've got about 5 days before i tear my car apart again and see what i'm doing wrong. Thanks for the research.

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            • #7
              Okay, i think i'm to the point where i believe its totally hopeless.
              So i spent all of last night at work reading i'd say about 75% of any thread regarding the m2-atx. Not that really means anything, thought i had it figured too..lol. anyway so..i drew up a diagram..(hand drawn so i can't load it on to here)

              based on what i had earlier..with the following:
              j1 -> car battery
              j3 -> to a slot in the fuse box that only gets pwr with ignition on
              j4 -> is screwed into the vehicle frame

              j2(4 pin)-> is connected to my lilliput
              j7(20 pin) is connected to my mobo which is a 12 pin connector)
              j8 is spliced to my power header on my mobo: pin 6(red) pin 8(black) IAW the above pic of the CASE CONNECTOR: front panel
              on the atx cable to my mobo the 12 pin. i found the green wire that according to VIA manual for my mobo it is the "PWR_ON" this is the cable i grounded.

              The only other wire was pin 6 :PWR_GRN (black)

              with this current set up, with power applied i can check as far as the fuse and it reads 12volts, but the computer does not pwr up. I flip flopped the J8 (mine you i was scared to do this) and still have no response from the computer.

              Just to be safe, make sure the computer does and still will power up i connected it to the ac power supply and plugged the computer into the wall and powers up fine no issues.

              Anyone have any idea what i'm doing wrong?
              oh..one last thing, I unplugged the atx 20 pin from the PS, checked the voltage out of the pin out on the mobo and the only voltage i got from any of the pins is the +5 volt Standby.

              my 20-pin to 12-pin atx cable i did have to splice to extend the length about an extra 8 inches that shouldn't matter right? i ohm'd it out and pin to pin is correct.

              Any suggestions, recommendations would be highly appreciated. thanks in advance

              Enraiha

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              • #8
                one thing you might want to keep in mind is what voltage/amperage the rocker switch you hooked up to the 12v line rated for, if it's lower than what the pc will draw you might want to use a relay to keep the switch from melting to a puddle, or just move the switch to the 12v signal wire.
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                • #9
                  ohhhh..hmmm...will have to get back with you on that one in about 30 minutes..thanks

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                  • #10
                    kk checked the switch and its a 12v dc rocker switch. 20 amp

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                    • #11
                      Originally posted by Enraiha View Post
                      Just to be safe, make sure the computer does and still will power up i connected it to the ac power supply and plugged the computer into the wall and powers up fine no issues.
                      Just wanted to make sure I understand what you said here. Was this a separate power supply? Or did you connect your M2 to a AC source?

                      Did you check if j8 is outputting anything? You can try out j9 in case something's wrong with j8.

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                      • #12
                        thanks for the follow up. i used the computer's ps, not the M2.just to make sure i didn't do any damage to the computer itself,
                        I did check the output of the J8 and didn't get any output as well as plugged into the j9 and check it with the multimeter too and didn't get any power out of any of the pins. Should there be a constant flow into any of the pins ?

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                        • #13
                          but what is the amperage? that's what causes components to heat up.
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                          How to speed up boot with buried features in msconfig

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                          • #14
                            I honesty don't remember if it should be a constant signal or a pulse. Maybe you can hook some LED up to it.

                            I just noticed you said:
                            Originally posted by Enraiha
                            oh..one last thing, I unplugged the atx 20 pin from the PS, checked the voltage out of the pin out on the mobo and the only voltage i got from any of the pins is the +5 volt Standby.
                            Are you getting 12V anywhere?

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                            • #15
                              Originally posted by Enraiha View Post
                              thanks for the follow up. i used the computer's ps, not the M2.just to make sure i didn't do any damage to the computer itself,
                              I did check the output of the J8 and didn't get any output as well as plugged into the j9 and check it with the multimeter too and didn't get any power out of any of the pins. Should there be a constant flow into any of the pins ?
                              J8 connects to ground when switched. You might be able to read it if you connect one pin of your multimeter to ground the other to one of the J8 pins. It should read open line (O.L.) or not connected or something until the pulse is sent. If you have a crappy/cheap meter though it may not be fast enough to register it.

                              And it is a pulse, not constant.
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                              1.9in x 2.9in -- 47mm x 73mm
                              30 Digital Outputs -- Directly drive a relay
                              15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
                              Buy now in the MP3Car.com Store

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