[mythtv-users] Update mythmobile pictures!

[Joseph H. Fry]

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).
> >
> >
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