On Sat, 15 Feb 2020 11:32:27 -0600, Richard Owlett wrote:

> It looks too small unless the accept touch of a stylus rather than a
> finger. For one of my potential uses I was considering displaying a
> pseudo-QWERTY layout for inputting alpha-numerics. Link to specs?
>
The Medion I'll need to replace sooner or later has a 3.5" diagonal
screen inside a wide bezel, so is 4.5" diagonal across the case.
Its screen, being consumer-grade WinCE, is probably 480 x 320.

I'll be running a port of the same WinCE program, LK8000, on the RPi: its
developers have already ported it to Linux. So, I think its safe to say
that the screen features would be the same size on the Adafruit screen
and a little bigger on the Pimoroni screen. Since I can use LK8000
without problems on the Medion, it should be fine on an RPi too.

> That's one it's advantages. My laptops run Debian.
>
Fair enough.

As to size: If necessary, I can make my own case from epoxy-board. All I
care about is that its overall size can be no bigger in height and width
than the Medion (4.1" x 3.125") or it will start to hide other
instruments on the panel. I think I can manage that even if I use the
Pimoroni screen. Here's the Medion in its usual place:

https://www.gregorie.org/gliding/libelle/panel_2017.jpg

Lastly, I don't mind how thick the thing is because it will be screwed to
a flexi-mount that supports it in front of my panel and anyway it will be
running off the glider's main batteries via a 12v->5v converter.
Even so, I may end up using a Pi Zero, simply because I'll need both
power and GPS signal in and USB data out so I can to download the log
after a flight. If I use a Pi Zero I can minimise connections: a D-9 for
power and GPS data in and a micro-USB or wifi for log data out.

However, you should definitely take note of Dennis's comment about bulk,
and consider whether you'd be better using a Pi Zero, or one of the small
Arduinos, rather than a bigger and much thicker Pi with its bank of
ethernet and USB B sockets on one end. The Pi Zero is 65mm x 30mm x 5-8mm.
It's thickness is not given on the drawings, but a case sold for it is
only 15 mm thick overall.

You might be able to get a Pi Zero plus a 4" screen and a battery into a
case that's a bit thinner than a bare Pi 2,3 or 4, but that would
certainly depend on the shape and size of the battery.


--
Martin    | martin at
Gregorie  | gregorie dot org

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