[BRLTTY] Pneumatic braille based on balls in a tube

[timothyhobbs at seznam.cz]

For a long time I looked at the raspberry pi, and at some other single board
computers. I ran into several problems. The most pressing problem with 
single board computers is the difficulty of connecting them up in a small 
case. The raspberry pi, for example, takes its power from USB. The idea of 
having a USB cable inside the case of my device seems wobbly, and weird, and
space consuming. I spent a lot of time trying to figure out how to arrange 
such computers so that the ports would be accessible and never came up with 
a good solution.

The second and totally unrelated problem, was that I wanted to use one of 
the open source boards, but none of the boards which fit my requirement of 
wifi access were really open source. For example, the wandboard, and the 
minnowboard both claim to be open source, but neither has full schematics, 
BOMs, and firmware source code available. I would far rather support an 
honestly proprietary product than to support a liar who wasn't open source 
anyways.

There are several SOM https://en.wikipedia.org/wiki/Computer-on-module 
specifications which allow for interchangable computer boards to be used in 
a project such as this one. These boards tend to be more expensive than the 
single board pcs, probably because they are not mass produced. However, from
an engineering standpoint it really seems to create a more robust and 
upgradable design.

Tim


---------- Původní zpráva ----------
Od: Samuel Thibault <samuel.thibault at ens-lyon.org>
Komu: Informal discussion between users and developers of BRLTTY. <brltty@
mielke.cc>
Datum: 24. 4. 2015 14:45:08
Předmět: Re: [BRLTTY] Pneumatic braille based on balls in a tube

"timothyhobbs at seznam.cz, le Fri 24 Apr 2015 13:24:48 +0200, a écrit :
> My current conception of the keyback is that it will have a full linux 
computer
> in it. This increases the price, but I think that it will be better that 
way.

With a Raspberry Pi it's not so costly and already very powerful.

Samuel
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