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Hi Mark,<br>
<br>
I don't recall the model with the joystick thingy. I think it was a
higher-end car, maybe a Lexus or Audi. I remember it looking like a
steel version of the common mushroom. <br>
<br>
My guess is that it was just a gimmicky interface to
up/down/left/right switches, but if it was more than that, it might
be a good UI precedent.<br>
<br>
Greg KO6TH<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Mark Cheavens wrote:<br>
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<div class="moz-cite-prefix">You have not said what make model of
car, so I have no idea if I have any experience with it.<br>
<br>
- Other comment from someone else about A and B models only have
composite video, that is not true. The later models (B+ have it,
but did not poplulate the connector).<br>
<br>
Mark<br>
KC5EVE<br>
On 1/17/2016 1:49 PM, Greg D via aprssig wrote:<br>
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Hi Lee, all,<br>
<br>
Yes, sorry. Typo... The Pi has a built-in baseband 640x480
video (aka RCA) output, so I won't need the adapter box.<br>
<br>
I'm expecting to run the video through a simple SPDT switch to
select either the Pi or backup camera. If I get fancy, maybe
tie that to the car's backup signal and use a relay to switch
automatically. No need or intention to sacrifice one for the
other.<br>
<br>
My expectation is that the system will be on RF primarily,
though I haven't located a good place for the antenna. I was
initially thinking to use a small bi-directional tracker-like
module (Rx and TX required), but will probably start with my
Kenwood D7. If I can do tethering with my cell phone, I might
be on IS too.<br>
<br>
The Accessory outlet does remain on for several minutes after
parking, but I really need to have something that's automatic
because I'd likely forget. So, either I make the Pi's file
system read-only (so it doesn't care about abrubt loss of
power), or trigger the shutdown automatically. My thought is to
put a small 5v NiCd battery on the 5v input rail, to hold the Pi
running for a bit, and trigger a shutdown when the +12 input
goes away. I'm not very familiar with the Pi yet, so perhaps it
has a low power suspend mode, where a small battery could hold
it for a couple of weeks. That would probably be ideal, though
I'd still need to trigger the state changes. Haven't had a
chance to investigate this, beyond recognizing that the issue
exists, at least in theory. Am I over-designing this?<br>
<br>
On the topic of the operator control, perhaps instead of
switches and GPIO pins, I recalled after my posting that some
cars have essentially a joystick mouse-like control mounted
between the seats. I'm not sure how well this would work on the
small screen, but that might solve the problem. Anybody have
one of these cars, and could relate how it works?<br>
<br>
Greg KO6TH<br>
<br>
<br>
<div class="moz-cite-prefix">Lee Bengston via aprssig wrote:<br>
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cite="mid:CAPF_JSLkrdbaFW5yH4iRw7NmKMX19RDA6HiKzhCKCdnLSp9stA@mail.gmail.com"
type="cite">
<p dir="ltr"><br>
On Jan 17, 2016 12:24 AM, "Greg D via aprssig" <<a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:aprssig@tapr.org">aprssig@tapr.org</a>>
wrote:<br>
><br>
> Hi folks,<br>
><br>
> Picking up on a thread I started a while back... Not
sure if this will lead to something permanent or not, but I
tought I'd give it a try.<br>
><br>
> I got access to the back of my car's in-dash unit, and
the video input connector. It's meant for use with a back
camera, which I currently don't have (though it's on the
wish list...). Found a VGA to RCA adapter box, and fired up
APRSIS32 which was loaded on a small laptop. Here's the
result:<br>
><br>
> <a moz-do-not-send="true"
href="http://home.wavecable.com/%7Eko6th/aprs_dash_display.jpg">http://home.wavecable.com/~ko6th/aprs_dash_display.jpg</a><br>
> <a moz-do-not-send="true"
href="http://home.wavecable.com/%7Eko6th/aprs_laptop.jpg">http://home.wavecable.com/~ko6th/aprs_laptop.jpg</a><br>
><br>
> Given the difficulty, if not questionable legality, of
controlling a GUI-based laptop while driving, I think the
next steps need to include:<br>
><br>
> 1. Replace the laptop and VGA adapter with a Raspberry
Pi. VGA output is built-in, also much better power draw and
small size. (The car is a sports car, so no room for
anything bigger.)</p>
<p dir="ltr">I think you meant RCA is built in, right?</p>
<p dir="ltr">> 2. Replace APRSIS32 with YAAC (for
Raspberry Pi compatiblity).<br>
><br>
> 3. Probably still need a keyboard for full control
while parked, but add some fixed key switches tied to
keyboard shortcuts for the common stuff while driving.
During the earlier exchange, Andrew figured it was a
"simple" matter of a Java library to bridge the swtiches to
keyboard shortcuts... Hope he's right.<br>
><br>
> 4. The Pi will boot itself when the car turns on, but
I need a way to automatically safely power down the Pi when
I turn the car off. Any ideas on this?<br>
><br>
A lot of vehicles don't shut the radio off immediately -
will eventually time out - and many will shut off once you
open the door. You could source the power from a source
that doesn't shut off right away and buy yourself time to
shut down gracefully.</p>
<p dir="ltr">Sounds like fun - my truck has a backup camera
that I would not want to be without. :-)</p>
<p dir="ltr">Lee - K5DAT</p>
<br>
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