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pc/electronics, cops, and can they do that?

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  • pc/electronics, cops, and can they do that?

    Well, after rocking the carpc for only a couple weeks, I gotta say it's awesome. Even while not fully finished, it's better than imagined.

    However, the wierdest thing also happened to me today. The carpc has never had anything go wrong yet (miracle in itself) despite some crazy driving .

    On the drive to work today, after turning off my street onto the main street, I happen to be behind a cop. Followed the cop for a mile or so, stopping at lights, etc. So, I was close to his/her cop car many times, with nothing going wrong. Down the road a fair bit more, the original cop turns off and I keep going. Not long after this I see a car pulled over from a different cop (they should've been out yesterday for st. patty's day). So I switch lanes as to give them some room. As soon as I pass the cop car, the carpc/touchscreen immediately turns off. I mean, it's not like the power switch was pressed or ignition shut off (i'm still driving) because it didn't hibernate. It was 1/2 a second and everything was hard shut off. It wasn't any cabling coming lose, because I turned it back on again with my power switch a few seconds later. Of course, it was annoying sitting through the chkdsk stuff and windows didn't shutdown properly, etc...

    I was in shock, but it could have been maybe I just don't know anything about PA law. So here's my question... Is it even possible for another car to have something/anything that would even cause this? Is it legal, even for cops to use if something does exist? Is there anything I can do about it?
    Current Worklog: TBA - '05 Rav4 (Mobo Dead).
    www.rav4world.com - Forums for Rav4 owners
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    -Basic forums live atm, come contribute!

  • #2
    What PSU you runnning, maybe it detected the battery was getting low and forced the shutdown.
    Corolla WorkLog

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    • #3
      I'm going to say that was a total coincidence. When that happened to me, there was a battery level issue that the power supply detected, and it shut down. What that happens there is no hibernate - just a total shutdown.
      Last edited by kegobeer; 03-18-2011, 09:18 AM. Reason: Typo
      1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

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      • #4
        If we go with the argument that the cops had a device (EMP), you would have found your car would have stopped and those around you would have stopped Or they have EMP's that solely target CarPc's.

        But being seriously for a moment, I suppose its not beyond possibiity that the Cop car emits a certain frequency that caused the psu to trigger a shutdown?? Think we need a brain bigger than mine, i just develop software.
        Corolla WorkLog

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        • #5
          Power supply is an M4 and battery is about a month old, carpc only in for a couple weeks. Never runs more than an hour a day, and I know it doesn't draw power without being at least in ignition, it acts like a head unit would, I tried it multiple times.

          Strange enough that it would turn on after it happened though? If the battery is that low, wouldn't it have turned off again anyways because of sensing it being low? Although, I've never config'd the M4, except for the dip switch for P1 mode, and that only works when the pc is on, so it doesn't turn on with ign.
          Current Worklog: TBA - '05 Rav4 (Mobo Dead).
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          www.flavorfeasts.com - Cooking website/forums
          -Basic forums live atm, come contribute!

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          • #6
            I've had my carpc just shut down before. There could have been a voltage fluctuation large enough to cause the power supply to shut down.
            1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

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            • #7
              I still find it wierd that it happened at that exact moment...

              If it was a voltage fluctuation, what are the chances that it was >30 and <6 volts, I think that's what the M4 can handle? Since I was already driving, I dont' think it should be spiking either...

              Hmm, maybe I'll go joyriding this weekend and see if I can find some more cops to drive by and see what happens. Could be fun ...
              Current Worklog: TBA - '05 Rav4 (Mobo Dead).
              www.rav4world.com - Forums for Rav4 owners
              www.flavorfeasts.com - Cooking website/forums
              -Basic forums live atm, come contribute!

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              • #8
                I'm pretty sure that the M4 has a minimum voltage that will cause it to shut down, and it's probably more like 10V. You'd have to check your manual. Plus, it's a computer and weird things just happen, especially when you put it into an automotive environment that's dependent on a 12V charging system. Unless you keep having problems with this, I wouldn't worry too much about it.

                I was having some pretty weird issues with sleep and my Opus power supply, until I called them and talked to one of the guys who designed it and was told how and why it does certain things. Now I don't have any problems.
                1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

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                • #9
                  it could have also been some loosely connected wires, and a bump..


                  but i can assure you, cops do not have EMP-type devices that they can fire at rogue drivers... too many safety risks for departments to even consider them..(most newer cars are drive-by-wire, or electrically powered brakes/power steering-- you'd loose steering control!!)
                  My OLD 2001 Mitsubishi Eclipse GT:
                  "The Project That Never Ended, until it did"


                  next project? subaru brz
                  carpc undecided

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                  • #10
                    Its not EMP...

                    Do they use radar speed detectors? Was it on?
                    That - coupled with an M4 - is a likely culprit.

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                    • #11
                      Originally posted by OldSpark View Post
                      Its not EMP...

                      Do they use radar speed detectors? Was it on?
                      That - coupled with an M4 - is a likely culprit.
                      Please explain. I've never heard of microwave radiation from a radar gun affecting electronics. I would figure if that was happening, since radar guns tend to stay on quite a bit on the open roads, that more people would report random shutdowns.
                      1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

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                      • #12
                        Originally posted by kegobeer View Post
                        Please explain. I've never heard of microwave radiation from a radar gun affecting electronics.
                        Eh?
                        So what is this thread about....?
                        It's a radar.
                        An M4 powered PC passed in close proximity and the M4 (or something) was interrupted.

                        What more do you require? An alternative explanation that accounts for it (other than coincidence and bumps)?


                        See the stuff on the M4s emanation of interference - is does little to suppress hi-freq noise.... (That's doesn't mean it'll be affected, simply that if hi freq interference is around, it will get in....)


                        As to radar, sure, speed radars are low power and very directed, but so too are security systems that inhibit vehicle operations (eg, parked outside shops etc).


                        But if you prefer coincidence, IMO that's fine since this case is statistically insignificant.
                        I however take a more scientific approach.

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                        • #13
                          See the stuff on the M4s emanation of interference - is does little to suppress hi-freq noise.... (That's doesn't mean it'll be affected, simply that if hi freq interference is around, it will get in....)


                          As to radar, sure, speed radars are low power and very directed, but so too are security systems that inhibit vehicle operations (eg, parked outside shops etc).


                          But if you prefer coincidence, IMO that's fine since this case is statistically insignificant.
                          I however take a more scientific approach.
                          I did note I believe that the cop had someone pulled over when I passes, perhaps it was a speeding ticket and the radar gun was used/still on. Maybe there is a theory behind this if it's true that high frequency's will affect operation of M4's...

                          Does anyone normally drive by a cop on the road? Perhaps even if you did, can't guarantee you had an M4 either. Maybe it's such a specific combination of events that it's a freak occurance and shouldn't really be worried about. Although, could be good if we did no there was a cause for M4's to behave like this in case someone else asks a similiar question or has a similiar experience.
                          Current Worklog: TBA - '05 Rav4 (Mobo Dead).
                          www.rav4world.com - Forums for Rav4 owners
                          www.flavorfeasts.com - Cooking website/forums
                          -Basic forums live atm, come contribute!

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                          • #14
                            I'm not restricting it to the M4 - any EM radiation can effect anything in any way - that happens all the time until detected (no pun) and fixed. (Hence why EM noise standards exist.)

                            But the duality of interference makes the M4 a logical possibility - as I said, we are half way there - it is likely any <whatever radiation> can get into the M4. Whether is effects it is another thing, though I suspect little in the M4's circuirty would quench it.

                            But it could be the screen - they were once very susceptible to noise.


                            I'll bet the norm - this will be put down to coincidence.
                            Then they find that cops with Iridium in combination with K-Band detectors at reinforcement (beat) distances exceeding 3.2uW/m2 might avalanche the D3 Schottky in brand-X LCD display.... but only on sunny days.


                            Hawaiin EMPs anyone?

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                            • #15
                              A Mystery that may never be solved, unless Myth Busters step in and do a show on "Can a Cop car shutdown you CarPc?"
                              Corolla WorkLog

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