[mythtv-users] Update mythmobile pictures!

[Matthew Brichacek]

Nothing yet, other than using a laptop.  The prototype that used the
FlexATX had 2 120G harddrives and one of the issues was vibration.  I
started designing some gel packs to hold them, but then I fried the MB
so didn't go any further.  As I run into problems I will try to find
solutions, so far I have been out four wheeling in the mountains and
haven't had any probelms, even though I always tread lightly it was
still pretty bumpy.  It's been through record snow storms and some
pretty hot days and long road trips with no issues yet but I expect some
problems along the lines of what you've mentioned.

Matt
 
On Sun, 2003-06-22 at 16:22, Joseph H. Fry wrote:
> Have you run into any environmental issues using this in your vehicle?
> Heat, cold, condensation, or vibration.... have you done anything to
> minimize them.
> 
> > -----Original Message-----
> > From: mythtv-users-bounces at snowman.net [mailto:mythtv-users-
> > bounces at snowman.net] On Behalf Of Matthew Brichacek
> > Sent: Sunday, June 22, 2003 6:07 PM
> > To: Discussion about mythtv
> > Subject: Re: [mythtv-users] Update mythmobile pictures!
> > 
> > You bet, my father is an EE and we sat down for a couple days to get
> > this all figured out.  Although I ended up using a diff setup than we
> > originally designed I will try to explain as much of each one as I
> can.
> > 
> > First, let me start off by saying if you are going to use a regular MB
> > and not a laptop or other low-power board then I would suggest the
> power
> > supply at http://www.opussolutions.com/ .   I have one of these I can
> > sell you cheaper than they have online since I don't need it anymore,
> > but it's only the PCB and not the power supply with the casing.  It
> > hooks to the MB and sends it signals for on/off and it also has some
> > deep discharge circuits on it.  I ended up going with a deep cycle
> > marine battery in the truck just to avoid deep discharges.
> > 
> > The setup I have it pretty simple.  Two 10 gauge wires come off the
> > battery and go to the back of the truck.  Positive goes to the 50A
> relay
> > and then to the 12v supply, negative is hooked directly up to the 12v
> > supply.  There is also a signal wire that comes off the stereo and
> sends
> > a 12v signal whenever the truck is turned on/off.  I use this to trip
> > the 50A relay and it keeps the circuit closed while the truck is
> > running.  The same signal wire also goes to the 1shot relay and sends
> a
> > signal to the MB through some soldiered connections on the MB, this
> > turns the machine on when it's off.  When the signal is taken away
> > (truck turns off) the 50A relay circuit opens back up and takes away
> > power from the laptop.  When power is taken away an acpi event is
> > triggered to start a 10 minute timer as described in the first email.
> > If the 50A relays circuit is closed again then that acpi event kills
> the
> > timer from the previous event and keeps the machine from turning off.
> > If the 10 minute timer finishes, it executes a clean shutdown and the
> > process starts all over again when the truck is turned on through the
> > 1shot signal.
> > If you aren't using a machine with an internal battery you could hook
> up
> > another timer relay that turns on when the 12v from the stereo is
> taken
> > away, that will keep power to your machine while you run a timer or
> just
> > do a quick shutdown.
> > 
> > Using a regular MB introduces some other problems to work around.  If
> > you want to put this all on a single PCB then you would need about 4
> > relays as well as some pretty heafty capasitors to hold your charge
> > while you shut down the machine.  I have this all put in a diagram and
> I
> > will try to find it and mail it to you off list, or post it on my
> server
> > so everyone can use it.  But again I have to suggest the opus system
> as
> > it was designed specifically for this, if your interested in grabbing
> > the one I have then message me off list.
> > 
> > Hope this helps, feel free to ask more questions.
> > 
> > Matt
> > 
> > 
> > On Sun, 2003-06-22 at 15:40, Max wrote:
> > > Maybe this is getting a bit too offtopic, but can you provide more
> > > information about the relay circuit, I've been meaning to do exactly
> > this
> > > kind of a setup for another project, and this may save me from re-
> > inventing
> > > the wheel.
> > >
> > > -M
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Matthew Brichacek" <mmbrich at customlinuxsolutions.com>
> > > To: "Discussion about mythtv" <mythtv-users at snowman.net>
> > > Sent: Sunday, June 22, 2003 2:25 PM
> > > Subject: Re: [mythtv-users] Update mythmobile pictures!
> > >
> > >
> > > > I bought the 12v power supply for the omnibook and have it wired
> > > > straight into the battery and the 50A relay turns on and off the
> power
> > > > to the 12v supply (gets a signal from the stereo when the truck is
> > > > turned on).
> > >
> > >
> > > _______________________________________________
> > > mythtv-users mailing list
> > > mythtv-users at snowman.net
> > > http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
> > 
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at snowman.net
> > http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
> 
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at snowman.net
> http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users