[aprssig] APRS in-dash display (update)
ko6th.greg at gmail.com
Sat Feb 6 15:15:55 CST 2016
Raspberry Pi connected to the car display using its built-in video
output (no adapters). For this experiment, I was mainly interested in
the quality of the display. Probably usable, but I'll let you be the
judge... Note: this is a "1U" DIN unit, which is rare these days; most
cars have "double DIN" (2U) units, with a much larger display, and
probably better inherent resolution, though you'd still be feeding it a
VGA-quality signal. Also note that the cable going from the Pi to the
display was rather long (came with the backup camera); a shorter cable
might improve the display a bit.
I also tried a rear view mirrow with a built-in display. Result is
considerably worse than the in-dash unit even though the physical screen
area is larger. Both the dash and mirror displays are fed from the same
source, via a "Y" cable. I may keep the new mirror even if I don't use
the display part, because it's physically larger than the original
(better view), and is slightly tinted for less glare. But as a display,
not so good.
Pi home screen on dash display:
Pi home screen on mirror's display:
YAAC running on Pi to the dash display:
The Pi was definitely usable via a regular USB mouse on the small
display, but I was sitting (not moving) in my garage at the time. On the
road, I doubt it would be safe to use while moving unless I can get some
sort of joy-stick like mouse for smoother control. Some of the click
targets are really small. More macro function buttons on the App itself
would be nice, for common functions.
Greg D wrote:
> Hi folks,
> 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.
> 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:
> Given the difficulty, if not questionable legality, of controlling a
> GUI-based laptop while driving, I think the next steps need to include:
> 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.)
> 2. Replace APRSIS32 with YAAC (for Raspberry Pi compatiblity).
> 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.
> 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?
> Anything else I'm missing?
> Greg KO6TH
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