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Actually, yes. NTSC, but driving forwards tends to be more
rewarding and less, um, stressful. <br>
<br>
The Pi has an NTSC output, so it should just plug in. The car's
Audio / Nav unit is a JVC KD-NXD505. I believe you can set it to
view the video (640x480, no sound) while driving. The unit's user
manual seems to indicate there's a configuration option to allow
this, but the interface is the worst I've seen, except perhaps for
my Alinco DR610 mobile rig. I may have to add a switch to fake out
the Reverse and/or Parking Brake input. <br>
<br>
Screen resolution will inherently be limited, but you really don't
want a lot of stuff on the screen while driving anyway. Add a
couple of switches to create a crude menu / control system (faking
out a non-mouse keyboard-like control), and the rest "should just
work".<br>
<br>
At least, that's the thought. Right now, my first hurdle is that
the NTSC pigtail that plugs into the back of the Nav unit is still
in the box in the house, and I can't reach the unit in the dash to
plug it in. Removing it from the dash is apparently not trivial, so
I may have to take it to the shop and have them do it.<br>
<br>
{sigh}<br>
<br>
Greg KO6TH<br>
<br>
<br>
<div class="moz-cite-prefix">Fred Hillhouse Jr wrote:<br>
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy">That is an
interesting idea Greg! I wish
my car stereo had that option. Actually it does if I use
NTSC and drive
backwards everywhere. ;)<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy">I used to think I
wanted more resolution
but there are trade-offs. If tiles are used, they are
256x256. On the typical
low resolution monitor, they would occupy about a 2”
square are and the
info was readable. Now the tile occupies about ½” square
(7” HD)
and the information is not readable without getting
close to it.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy">Best regards,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy">Fred N7FMH<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font color="black" face="Tahoma"
size="2"><span
style="font-size:10.0pt;font-family:Tahoma;color:windowtext;font-weight:bold">From:</span></font></b><font
color="black" face="Tahoma" size="2"><span
style="font-size:10.0pt;font-family:Tahoma;
color:windowtext"> aprssig
[<a class="moz-txt-link-freetext" href="mailto:aprssig-bounces@tapr.org">mailto:aprssig-bounces@tapr.org</a>] <b><span
style="font-weight:bold">On Behalf Of </span></b>Greg
D via aprssig<br>
<b><span style="font-weight:bold">Sent:</span></b>
Wednesday, August 12, 2015
12:38 AM<br>
<b><span style="font-weight:bold">To:</span></b>
Andrew P.; <st1:personname w:st="on">TAPR APRS
Mailing List</st1:personname><br>
<b><span style="font-weight:bold">Subject:</span></b>
Re: [aprssig] Mobile
Off-Air Display</span></font><font color="black"><span
style="color:windowtext"><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font color="black" face="Times New
Roman" size="3"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><font
color="black" face="Times New Roman" size="3"><span
style="font-size:12.0pt">Hi Andrew,<br>
<br>
SD cards have a speed rating, which I presume would
affect the read and/or
write performance you saw. What sort of pedigree did
the SD cards you
used have?<br>
<br>
I'm still thinking of connecting a Pi to the Video-in on
my car's audio/nav
unit (at a whopping 640x480 resolution) and doing an Rx
APRS display that
way. Could also connect a USB web-cam to the Pi for a
back-up camera,
etc., etc. Once you have a computer on board, the sky
is the limit.<br>
<br>
Greg KO6TH<br>
<br>
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font color="black" face="Times New
Roman" size="3"><span style="font-size:12.0pt">Andrew P.
via aprssig wrote:<o:p></o:p></span></font></p>
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cite="mid:BLU179-W18EE86306AE4B69E09D025B8700@phx.gbl"
type="cite">
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<p class="MsoNormal"><font color="black" face="Times New
Roman" size="3"><span style="font-size:12.0pt">I hate
to bad-mouth my own product, but the Pi's disk
storage (on an SD card) is just too slow for map
rendering in YAAC on a mobile
station (it is up to barely tolerable on a Pi B 2).
I've accelerated the
rendering code in YAAC about as far as I can, and on
a Pi the load is now
mostly reading the disk files of mapping data,
rather than the actual
rendering. I need to conduct some experiments with
USB memory sticks to see if
they are any faster than SD cards on the Pi as a
storage device for YAAC map
data. And I've looked at those 7" LCD screens they
have for the Pi; nice
idea, but how do you scotch-tape and chewing-gum the
Pi to one of those screens
so it will hold together in the mobile environment?<br>
<br>
Andrew, KA2DDO<br>
author of YAAC ("Yet Another APRS Client")<br>
<a href="http://www.ka2ddo.org/ka2ddo/YAAC.html"
moz-do-not-send="true">http://www.ka2ddo.org/ka2ddo/YAAC.html</a><o:p></o:p></span></font></p>
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</blockquote>
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