Re: Debian GNU/Linux on tablet hardware
On Saturday 10 December 2011 02:01:51 Luke Kenneth Casson Leighton wrote:
> batteries / power. ah. when you say "digital photo frame", do you
> mean "portable device" or do you mean "put it on the wall or
> mantlepiece"?
I mean always on power socket. No batteries
> > Then, we'd need to field test our device. This could be done with
> > netbooks or small tablets, but not with a bunch of boards and wires ;-)
> > . We'd need ~ 10 of them to lend to family and neighbours and get
> > feedbacks.
>
> ok, well we have about 17 committed so far. the hardware development
> costs (PCB, tooling) are about $USD 2,000. with 10 more, that would
> be about $75 each for one (fully-populated, fully-functional but with
> no external case) CPU card.
This thread started on tablet hardware. Do you have a price range for such a
device ? (i.e. with screen and case)
> an overlay resistive touchscreen is about $5, typically. they do
> however require calibration: they're also sensitive to temperature,
> humidity etc.
ok I've seen this kind of device while repairing my kid's gameboy.
> capacitive ones made of glass are *MORE* expensive than the
> same-sized LCD! absolutely ridiculous, but that's the way it goes.
> they're also heavier (because they have to be structurally strong).
> there do exist plastic capacitive touchpanels, they're still in
> development, the price _will_ come down... at some point.
ok let's forget these.
> bottom line is: touchscreens sound great until you look into the cost
> and useability.
The alternative is a remote control. Generic ones are used to navigate in
menus. But this is not user friendly for older people. I'm thinking about
having a more specific remote control, but I'm worried about the development
cost (PCB, plastic molds...)
> there are some options however for very coarse-grained touchscreens.
> if you can get away with "button-sized" fixed areas (such as used on
> microwave ovens) then costs are dramatically reduced.
I guess that such buttons could be drawn on the screen when required. One
touch anywhere will trigger drawing buttons on screen.
> fortunately, electrons haven't changed charge or anything like that:
> the speed of light is still the same constant, as best we are aware,
> and V still equals I times R :)
;-)
All the best
Dominique
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