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3d printed tablet casework

http://rhombus-tech.net/community_ideas/kde_tablet/news/

turned out okay for a first print.  lots of thought required, as 3d
printing of parts to use as laminates is not entirely satisfactory.

l.

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EOMA68-IC3128 revision 2 back from assembly and is working

http://rhombus-tech.net/icubecorp/IC1T/news/

no hardware faults found, which is fantastic.  they have not been sent
back to me yet so i have to run some tests here first but this looks
like these cpu cards (which are FSF Endorseable) may be added to the
crowdfunding campaign.

hooray.

l.

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sahil mehta | 16 Dec 15:35 2014
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Unsubscribe from the mailing list

Hi,
Kindly un-subscribe this mail id from the mailing list.

Thanks 
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tablet rev 3.2 layout

http://rhombus-tech.net/community_ideas/kde_tablet/news/

well it's a fixed PCB size, doesn't have to be a split design, but
there's no possibility of sharing this across 2 or more designs.
because of that i've cut out the extra components.  still working on
getting the layout right: the current issue is that the LCD is taller
so obscures the middle-centred camera.  that means the camera needs to
move to the corner.

it's an almost never-ending series of details, aaaaaaa!

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tablet re-re-design

ok so i tried the new layout... _after_ joining all the tracks up of
course... and unnnfortunately the cpu card slot is so far down that
the battery is squashed badly at the bottom (long) end and is far too
small.

so... aaaaaaagh!  i have to begin again :)  next attempt will be to
turn the cpu card round 180 degrees (so it comes out on the right).

ah all good fun...

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Why EOMA68 will advance both free software and free hardware « Nico Rikken

http://nicorikken.eu/blog/why-eoma68-will-advance-both-free-software-and-free-hardware/

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hannstar LCDs LED backlight circuit

On Tue, Dec 9, 2014 at 8:49 AM, joem <joem <at> martindale-electric.co.uk> wrote:
> On Mon, 2014-12-08 at 15:45 +0000, Luke Kenneth Casson Leighton wrote:
>
>>  ... *deep breath*... but.... hold everything, i've never been a great
>> fan of the 1024x600 LCD panels
>
> hmmm... thinks odroid-vu
> http://www.hardkernel.com/main/products/prdt_info.php?g_code=G140383714860
>
> Miniature HDMI monitor for $120.
> I bought one. If there were more of these things around
> with variety then lessens need for fixed screen.

 which reminds me: i need to work out a circuit for driving the LCD
backlight.  does anyone have e.g. one of these:
http://www.adafruit.com/products/1931

i need an example circuit to work from: the one that i have uses the
SY7201 and it is designed to pulse the LEDs, whereas the Hannstar LCDs
have their own dedicated LED backlight PWM input.

l.

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flying squirrel tablet

time for a bit of a rant :)

i've been working on the tablet PCB now for... literally months over
the past year or more, and i can't quite believe that every time i
look at it i find something - yet another thing - that needs fixing or
improving.

the latest was noticing that NMI# from the tablet's AXP209 wasn't
connected to one of the EINTs on the EOMA68 connector, and noticing
that 18-pin RGB/TTL with the 8.9in LCD (only 3 lane LVDS) is
incompatible with 24-pin RGB/TTL of the 7in LCD (4 lane LVDS).  so,
goodbye all the resistors for selecting different panels, and then i
noticed that the power tracks were crossing the LVDS lines so had to
completely reorganise those.

i also noticed that the SD/MMC needed moving upwards a bit (so that
SDcards could be poked into the case and actually... y'know... lock?),
and...

... well, it's just a heck of a lot of detailed work and i'm just...
amazed that there's so much to do!

oh - one other hilarious thing: i tracked down a company that makes a
TI SN75LVDS83b.... the name is *not* texas instruments, it's novatek
:)  it's the NT7181 and it's literally identical.  even the ability to
switch TTL levels so that it's 1.8, 2.5 and 3.3v TTL compatible
depending on input voltage.

anyway it's kiinda fun...

l.

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http://rhombus-tech.net/community_ideas/kde_tablet/news/

started on a first revision of the tablet casework, as a pyopenscad
program, using a blender-exported STL as the "ghost" template to work
out how the case should surround the parts.  it's done as layers so
may either be made of wooden laminates or 3D printed and assembled
using screws/bolts.

l.

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flying squirrel rev 3.1

http://rhombus-tech.net/community_ideas/kde_tablet/news/

so with the micro-desktop and eoma68-a20 underway i'm refining and
updating other PCBs such as the flying squirrel PCB and the
eoma68-jz4775.  the 2nd revision ic3128 PCB should have gone for PCB
printing already and assembly in about a week or so's time.

just as a reminder i've designed the flying squirrel PCB to accept not
one but two LCD panels: the 8.9in 1024x768 LG screen and the 7in
1024x600.

l.

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joem | 2 Dec 16:37 2014
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Debian boots in 0.87 seconds

Debian boots in 0.87 seconds:

http://linuxgizmos.com/headless-arm9-sbc-boots-linux-in-less-than-one-seconds/

http://www.embeddedarm.com/products/board-detail.php?product=TS-7250-V2


Good if this could be force marched to happen EOMA / Allwinner CPU.

A complete world game changer and a lot of funds will get
released for dormant projects that need fast boot + linux.

Crowd funding world would go beserk :)

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Gmane