Discussion:
[Arm-netbook] micro desktop
Luke Kenneth Casson Leighton
2014-05-29 16:33:32 UTC
Permalink
http://rhombus-tech.net/community_ideas/micro_desktop/news/

as promised the micro desktop is being developed, news and features on the page.

l.
Christopher Havel
2014-05-29 16:55:12 UTC
Permalink
On Thu, May 29, 2014 at 12:33 PM, Luke Kenneth Casson Leighton <
Post by Luke Kenneth Casson Leighton
http://rhombus-tech.net/community_ideas/micro_desktop/news/
as promised the micro desktop is being developed, news and features on the page.
l.
What voltage is the power input? 5v DC I assume? Be aware that 5v power
supplies on eg eBay (when the customer wants to replace things later on)
can come with either 5.5*2.1mm or 5.5*2.5mm plugs. A 5.5*2.5mm plug in that
socket will physically fit, but it will heat up and burn out the jack --
and the less-than-ideal connection will inevitably screw things up in other
ways as well...

I can think of two ways to fix this. One is to make it a 5.5*2.5mm jack
(this is probably simplest, easiest, and best). The other is to label it
clearly on both PCB and outer enclosure. If the second idea (labeling) is
chosen, then it becomes (logically) necessary somehow to find some means of
convincing the consumer/customer never to put a 2.5mm ID plug in that jack,
which is a very difficult task. I've got decent eyes and *I* can't see the
difference, and a lot of people in the US (especially in the region where I
live) seem to be very good at ignoring warning labels and, consequentially,
doing very stupid things that break everything (whereupon they complain,
usually through the courts, that it wasn't labeled adequately).

There is an added bonus to making the jack 2.5mm ID -- most 12v power
supplies with barrel jacks are 2.1mm ID -- meaning that if a consumer is
totally clueless about voltages and how not to fry a computer by severely
overvolting it, they will be largely unsuccessful in replacing the 5v wart
with a 12v wart... it just won't fit.

You really do want to be thinking of the "Doug Hefernan" type here. (That
was the name of the character portrayed by Kevin James on a sitcom called
"The King of Queens". I can easily picture him saying "oh shut up all of
these adapters are the same" and plugging in the wrong one to the tune of a
dramatic shower of sparks... there are a LOT of people Stateside who are
like that, sadly.)
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Alexander Stephen Thomas Ross
2014-05-29 17:59:46 UTC
Permalink
thanks super human luke ;) .

what about a flexible power suppy with wide voltage ranges? 3V(?) to
13V. so it can be connect to a car/12v batt and a built in Li-* battery
charger/monitor? I guess this would mean needing to use the ardunio-like
chip for the power status info? so not so easy then. well there's
microups
https://www.indiegogo.com/projects/microups-for-raspberry-beaglebone-cubieboard/

while it looks like It's not so suitable for my diy handheld computer
project with it having vga instead of plain RGB/TTL. I'll order one
anyway, I'll find a use for it :)
Luke Kenneth Casson Leighton
2014-05-29 19:56:15 UTC
Permalink
On Thu, May 29, 2014 at 6:59 PM, Alexander Stephen Thomas Ross
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thanks super human luke ;) .
what about a flexible power suppy with wide voltage ranges?
done already - not 3V, but 4.5V
while it looks like It's not so suitable for my diy handheld computer
project with it having vga instead of plain RGB/TTL. I'll order one
anyway, I'll find a use for it :)
you got a MEBv1 already, right?
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Alexander Stephen Thomas Ross
2014-05-29 21:07:58 UTC
Permalink
Post by Luke Kenneth Casson Leighton
On Thu, May 29, 2014 at 6:59 PM, Alexander Stephen Thomas Ross
thanks super human luke ;) .
what about a flexible power suppy with wide voltage ranges?
Post by Luke Kenneth Casson Leighton
done already - not 3V, but 4.5V
ok, 3v (rounded to the nearest hole num.) was only cus I was thinking
about Li-* batterys which and 3.3~v.
Post by Luke Kenneth Casson Leighton
while it looks like It's not so suitable for my diy handheld computer
project with it having vga instead of plain RGB/TTL. I'll order one
anyway, I'll find a use for it :)
Post by Luke Kenneth Casson Leighton
you got a MEBv1 already, right?
MEB?

oh...
Don't think that I can design one. that's beyond me. I was just going to
stick some bits together which is about my level. sorry if I hadn’t
communicated this and got peoples hopes up. It's going to be a bulky
pocket computer for large pockets hehe. I don't know how hard it would
be to learn how to do it but I just can't spend the time it would need
on it. nor would I have a few hundred £ to get it made up. Better off
becoming a £100,000aire by shifting my butt and getting some work done
on non-existing biz X. :) then I would have funds to donate :D. ok I'm
dreaming but thats my goal (make money to fund projects I like and other
non-£ goals).
Luke Kenneth Casson Leighton
2014-05-29 21:18:26 UTC
Permalink
On Thu, May 29, 2014 at 10:07 PM, Alexander Stephen Thomas Ross
Post by Alexander Stephen Thomas Ross
Post by Luke Kenneth Casson Leighton
you got a MEBv1 already, right?
MEB?
oh...
Don't think that I can design one.
it's already done alex.
Luke Kenneth Casson Leighton
2014-05-29 19:55:17 UTC
Permalink
On Thu, May 29, 2014 at 5:55 PM, Christopher Havel
Post by Christopher Havel
On Thu, May 29, 2014 at 12:33 PM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
http://rhombus-tech.net/community_ideas/micro_desktop/news/
as promised the micro desktop is being developed, news and features on the page.
l.
What voltage is the power input?
it iiiis aaaaaa.... RT8288A so that's a buck converter, input
anywhere between 4.5V and 26V, and it's tuned with 2 resistors to
create 5.0v. it's about 75% efficient or so according to the
datasheet.

so luckily, 5V or 12V input PSU it really won't care. the caution
about the 2 different plugs appreciated, but i have already done the
part and i know it takes time to redo them and find suitable
replacements and the suppliers and so on, and i'm not hugely keen on
going through that again right now.

i think a good voltage range is enough to be getting on with: the PSU
only needs to be 10W so i think we're good.

l.
Boris Barbour
2014-05-29 20:00:47 UTC
Permalink
Post by Luke Kenneth Casson Leighton
so luckily, 5V or 12V input PSU it really won't care. the caution
about the 2 different plugs appreciated, but i have already done the
part and i know it takes time to redo them and find suitable
replacements and the suppliers and so on, and i'm not hugely keen on
going through that again right now.
I think for a first, demonstration product we can expect buyers to use a
power supply with the correct specifications. There'll be plenty of time
to refine and idiot-proof the design before mass production starts...

Quick, cheap, easy are definitely the priorities at the moment.
Luke Kenneth Casson Leighton
2014-05-29 20:43:53 UTC
Permalink
BOM and schematic PDF are here, review appreciated.
i have to fix up the EOMA68-A20 revise it to remove SATA, add 2nd USB
etc. before completing this board but we have enough to be getting on
with for pricing from the BOM.

l.
Christopher Havel
2014-05-29 20:47:26 UTC
Permalink
Just so I'm aware -- I know I can't afford it; I wish I could so much that
it almost physically hurts -- about how much would it be for a revised A20
card and a mini desktop setup, before shipping?


On Thu, May 29, 2014 at 4:43 PM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
BOM and schematic PDF are here, review appreciated.
i have to fix up the EOMA68-A20 revise it to remove SATA, add 2nd USB
etc. before completing this board but we have enough to be getting on
with for pricing from the BOM.
l.
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Luke Kenneth Casson Leighton
2014-05-29 21:20:39 UTC
Permalink
On Thu, May 29, 2014 at 9:47 PM, Christopher Havel
Post by Christopher Havel
Just so I'm aware -- I know I can't afford it; I wish I could so much that
it almost physically hurts -- about how much would it be for a revised A20
card and a mini desktop setup, before shipping?
it entirely depends on quantity ordered. 25 would be around the $160
mark including shipping, 100 probably around the $120 and 500 probably
around the $100 mark. by the time you get to 2500 that's when it can
be around $75.

l.
Christopher Havel
2014-05-29 21:22:35 UTC
Permalink
I'd only need one... I'm one lonely hobbyist... I'd get two but Mom is a
Windows lover.


On Thu, May 29, 2014 at 5:20 PM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
On Thu, May 29, 2014 at 9:47 PM, Christopher Havel
Post by Christopher Havel
Just so I'm aware -- I know I can't afford it; I wish I could so much
that
Post by Christopher Havel
it almost physically hurts -- about how much would it be for a revised
A20
Post by Christopher Havel
card and a mini desktop setup, before shipping?
it entirely depends on quantity ordered. 25 would be around the $160
mark including shipping, 100 probably around the $120 and 500 probably
around the $100 mark. by the time you get to 2500 that's when it can
be around $75.
l.
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Luke Kenneth Casson Leighton
2014-05-29 21:29:52 UTC
Permalink
On Thu, May 29, 2014 at 10:22 PM, Christopher Havel
Post by Christopher Havel
I'd only need one... I'm one lonely hobbyist... I'd get two but Mom is a
Windows lover.
ooo, steadyyy :)

so. you're one. so now we need 24, or 99, or 499, or 2499 :)
Christopher Havel
2014-05-29 21:33:10 UTC
Permalink
On Thu, May 29, 2014 at 5:29 PM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
so. you're one. so now we need 24, or 99, or 499, or 2499 :)
I'm one if I can pay for it when the time comes. That's always a very large
question mark...

I have almost exactly $2k per month for two people. Here in my little North
Carolina town, that's just barely enough for bills and food... we rarely
have anything left over at the end of the month, and often we're in the
red.
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Luke Kenneth Casson Leighton
2014-05-29 21:38:11 UTC
Permalink
On Thu, May 29, 2014 at 10:33 PM, Christopher Havel
Post by Christopher Havel
On Thu, May 29, 2014 at 5:29 PM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
so. you're one. so now we need 24, or 99, or 499, or 2499 :)
I'm one if I can pay for it when the time comes. That's always a very large
question mark...
I have almost exactly $2k per month for two people. Here in my little North
Carolina town, that's just barely enough for bills and food... we rarely
have anything left over at the end of the month, and often we're in the red.
ok, so tell me - i take it you have time on your hands: what can you
do for this project that's worth the cost of one of these
micro-desktop boards and a CPU Card?

l.
Christopher Havel
2014-05-29 21:52:26 UTC
Permalink
On Thu, May 29, 2014 at 5:38 PM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
ok, so tell me - i take it you have time on your hands: what can you
do for this project that's worth the cost of one of these
micro-desktop boards and a CPU Card?
I'll be honest: I have no idea. I did put up that R-2R ladder thing, but
that's about the extent of what I can do with electronics right now. I'm a
real noob there. Programming for me is limited to QuickBASIC (specifically
MS QuickBASIC PDS 7.1 or /very/ similar). I've tried three times to learn
C++ and it went rather poorly (I'm being kind) all three times. Needless to
say, that's basically useless as well unless you want to run FreeDOS on
these cards for something (I don't think so!). I could probably port over
to QB64 if I wanted to muck with that, but it'd be a real PITA for not much
gain.

I'm something of an artist, but I'm much better with pencil/pen and paper
than with computer graphics so I probably can't even do advertising stuff.
Right now I don't even have computer graphics capability -- a couple months
ago I moved to Linux full time, and I need to install WINE to get my
software (CorelDRAW X3, a gift from my father) to run in Puppy (my distro
of choice) -- and I have not installed WINE yet. (Once I do, making
CorelDRAW actually work will take some finagling.) I took a drafting course
in high school (ten years ago) and somewhere I have a book (if I haven't
gotten rid of it) on drafting, but I'm allergic to using multiple pencils
(meaning all lines are the same width) and I have a hard time with rulers
(they move on me, lol!). I'm also not that hot at thinking in 3D... I'm
positively pathetic at shading (when I'm not doing drafting) and I simply
cannot wrap my head around eg 3D modeling (I tried Sketchup... Sketchup and
I sort of came to a mutual understanding that things were not going to work
out, and we parted ways). I can do orthos, and I can usually avoid
designing something that's too Escher-esque to work in Euclidean space, but
I do have my moments. Also I'm totally worthless drawing organic figures.
Flowers and people are very hard for me to draw for some reason...

*phew* that ended up being a little longer than I thought it would.
Hopefully there's something in there that's useful.
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Luke Kenneth Casson Leighton
2014-05-30 08:16:31 UTC
Permalink
On Thu, May 29, 2014 at 10:52 PM, Christopher Havel
Post by Christopher Havel
On Thu, May 29, 2014 at 5:38 PM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
ok, so tell me - i take it you have time on your hands: what can you
do for this project that's worth the cost of one of these
micro-desktop boards and a CPU Card?
I'll be honest: I have no idea.
ok, i got one - how about putting on the eoma discussion page the
stuff that was talked about a few days ago? just cut/paste and then
perhaps research some of the arduino material.

l.
Christopher Havel
2014-05-31 03:32:02 UTC
Permalink
On Fri, May 30, 2014 at 4:16 AM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
ok, i got one - how about putting on the eoma discussion page the
stuff that was talked about a few days ago? just cut/paste and then
perhaps research some of the arduino material.
Just looked back at this -- I honestly thought it was someone else who
posted it and was going to ask your opinion, LOL. I can definitely do
copypasta from thread to discussion page, although if it uses neither HTML
nor BBCode for formatting I'll have issues. I'll be starting tomorrow at
the earliest, since it's getting late here now -- what specific
threads/content were you thinking of, so I don't mess up? (I have a very
short memory, and I'm easily confused -- sorry!)

Also: I know very little about Arduino -- except that it's programmed
primarily in a language I don't speak ;) I'll have to conquer that,
eventually, for a project of my own... but for now that is not to be. I've
done a little work with PICAXE but they won't work here -- no derivative
works for them, *and* they're closed-source. I know someone who is very
heavily into Arduino stuff, but I've gotten the impression from what he's
told me in the past, that he'd probably not want to be roped into
contributing to EOMA. He's trying to forget his past forays into
electronics and computers so that he can focus as exclusively as possible
on Arduino stuff... I can sort of understand and respect that. He's been
doing that stuff for a very long time, is my understanding, so he probably
is just clearing space so new knowledge can be stored :P

I do have some obligation to him, though, to expand my electronic knowledge
-- after all, he did give me a 70s vintage Tektronix 422 recently ;) I've
no idea how to use it yet -- I need to get on that, soon. (He gave me the
manual with the scope...) Maybe once I get the hang of that, I can
contribute more... I dunno. I've also seen, on Hackaday, a very simple
device that would permit me to run that o-scope as an 8-channel logic
analyzer, although it would pale in comparison to the real thing... IIRC,
it's basically a shift-register setup. I have the Hackaday blurb
bookmarked, if people are interested.

For now, it's late, and I'm going to wander off towards my bed.
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Luke Kenneth Casson Leighton
2014-05-31 07:38:14 UTC
Permalink
On Sat, May 31, 2014 at 4:32 AM, Christopher Havel
Post by Christopher Havel
On Fri, May 30, 2014 at 4:16 AM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
ok, i got one - how about putting on the eoma discussion page the
stuff that was talked about a few days ago? just cut/paste and then
perhaps research some of the arduino material.
Just looked back at this -- I honestly thought it was someone else who
posted it and was going to ask your opinion, LOL. I can definitely do
copypasta from thread to discussion page, although if it uses neither HTML
nor BBCode for formatting I'll have issues. I'll be starting tomorrow at the
earliest, since it's getting late here now -- what specific threads/content
were you thinking of, so I don't mess up? (I have a very short memory, and
I'm easily confused -- sorry!)
foundation, standards implementation, purpose of trademark protection.
Christopher Havel
2014-05-31 15:06:22 UTC
Permalink
Luke -- I put in some stuff on the Rhombus-Tech discussion page.

It shows up at http://rhombus-tech.net/index/discussion/?updated
...but it's not showing at http://rhombus-tech.net/index/discussion
<http://rhombus-tech.net/index/discussion/?updated>

Any reason for that? How do I fix that, or is that someone else's job?
Also, I know that's not all of what you wanted in there, but let me know
what you think of what's there now and I can add more once you tell me what
you think.


On Sat, May 31, 2014 at 3:38 AM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
On Sat, May 31, 2014 at 4:32 AM, Christopher Havel
Post by Christopher Havel
On Fri, May 30, 2014 at 4:16 AM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
ok, i got one - how about putting on the eoma discussion page the
stuff that was talked about a few days ago? just cut/paste and then
perhaps research some of the arduino material.
Just looked back at this -- I honestly thought it was someone else who
posted it and was going to ask your opinion, LOL. I can definitely do
copypasta from thread to discussion page, although if it uses neither
HTML
Post by Christopher Havel
nor BBCode for formatting I'll have issues. I'll be starting tomorrow at
the
Post by Christopher Havel
earliest, since it's getting late here now -- what specific
threads/content
Post by Christopher Havel
were you thinking of, so I don't mess up? (I have a very short memory,
and
Post by Christopher Havel
I'm easily confused -- sorry!)
foundation, standards implementation, purpose of trademark protection.
_______________________________________________
arm-netbook mailing list arm-netbook at lists.phcomp.co.uk
http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook
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Luke Kenneth Casson Leighton
2014-05-31 18:42:05 UTC
Permalink
On Sat, May 31, 2014 at 4:06 PM, Christopher Havel
Post by Christopher Havel
Luke -- I put in some stuff on the Rhombus-Tech discussion page.
It shows up at http://rhombus-tech.net/index/discussion/?updated
...but it's not showing at http://rhombus-tech.net/index/discussion
index is an HTML page (not mdwn) so it won't - that's ok.
Post by Christopher Havel
Any reason for that? How do I fix that, or is that someone else's job? Also,
I know that's not all of what you wanted in there, but let me know what you
think of what's there now and I can add more once you tell me what you
think.
looks great. would you like to follow some of the leads recommended
(arduino ones) and see what they do, cut/paste into that page, then we
can evaluate them?

l.
Post by Christopher Havel
On Sat, May 31, 2014 at 3:38 AM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
On Sat, May 31, 2014 at 4:32 AM, Christopher Havel
Post by Christopher Havel
On Fri, May 30, 2014 at 4:16 AM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
ok, i got one - how about putting on the eoma discussion page the
stuff that was talked about a few days ago? just cut/paste and then
perhaps research some of the arduino material.
Just looked back at this -- I honestly thought it was someone else who
posted it and was going to ask your opinion, LOL. I can definitely do
copypasta from thread to discussion page, although if it uses neither HTML
nor BBCode for formatting I'll have issues. I'll be starting tomorrow at the
earliest, since it's getting late here now -- what specific
threads/content
were you thinking of, so I don't mess up? (I have a very short memory, and
I'm easily confused -- sorry!)
foundation, standards implementation, purpose of trademark protection.
_______________________________________________
arm-netbook mailing list arm-netbook at lists.phcomp.co.uk
http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook
Send large attachments to arm-netbook at files.phcomp.co.uk
_______________________________________________
arm-netbook mailing list arm-netbook at lists.phcomp.co.uk
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Send large attachments to arm-netbook at files.phcomp.co.uk
Christopher Havel
2014-05-31 18:45:01 UTC
Permalink
On Sat, May 31, 2014 at 2:42 PM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
looks great. would you like to follow some of the leads recommended
(arduino ones) and see what they do, cut/paste into that page, then we
can evaluate them?
I guess... I don't really have a clear picture tho of what you're looking
for (my fault -- I *did* say I was clueless!)...
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Luke Kenneth Casson Leighton
2014-05-31 21:18:30 UTC
Permalink
On Sat, May 31, 2014 at 7:45 PM, Christopher Havel
Post by Christopher Havel
On Sat, May 31, 2014 at 2:42 PM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
looks great. would you like to follow some of the leads recommended
(arduino ones) and see what they do, cut/paste into that page, then we
can evaluate them?
I guess... I don't really have a clear picture tho of what you're looking
for (my fault -- I *did* say I was clueless!)...
basically i would like a summary of what the arduino company is
allowing 3rd parties to do, and under what conditions. i'd like to
see a summary of what is on the links that someone posted (and you
cut/paste onto the discussion page).

l.
Christopher Havel
2014-05-31 21:19:59 UTC
Permalink
On Sat, May 31, 2014 at 5:18 PM, Luke Kenneth Casson Leighton <lkcl at lkcl.net
Post by Luke Kenneth Casson Leighton
basically i would like a summary of what the arduino company is
allowing 3rd parties to do, and under what conditions. i'd like to
see a summary of what is on the links that someone posted (and you
cut/paste onto the discussion page).
I can do that! It'll be a couple hours tho -- I'm workin on somethin :P
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Luke Kenneth Casson Leighton
2014-05-31 21:23:47 UTC
Permalink
On Sat, May 31, 2014 at 10:19 PM, Christopher Havel
Post by Christopher Havel
On Sat, May 31, 2014 at 5:18 PM, Luke Kenneth Casson Leighton
Post by Luke Kenneth Casson Leighton
basically i would like a summary of what the arduino company is
allowing 3rd parties to do, and under what conditions. i'd like to
see a summary of what is on the links that someone posted (and you
cut/paste onto the discussion page).
I can do that! It'll be a couple hours tho -- I'm workin on somethin :P
no rush.
Post by Christopher Havel
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Dominique Dumont
2014-06-03 08:25:17 UTC
Permalink
25 [ revised A20 card and mini desktop setup ] would be around the $160
mark including shipping,
I would take one at that price
100 probably around the $120
Or 2 at that price.

All the best
--
https://github.com/dod38fr/ -o- http://search.cpan.org/~ddumont/
http://ddumont.wordpress.com/ -o- irc: dod at irc.debian.org
Stéphane Goujet
2014-05-29 22:20:34 UTC
Permalink
Post by Luke Kenneth Casson Leighton
BOM and schematic PDF are here, review appreciated.
I can get the BOM, but not the PDF :

Forbidden
You don't have permission to access
/~lkcl/eoma/microdesktop/microdesktop.pdf on this server.


Goodbye,
Stéphane.
Luke Kenneth Casson Leighton
2014-05-30 08:15:12 UTC
Permalink
On Thu, May 29, 2014 at 11:20 PM, Stéphane Goujet
Post by Stéphane Goujet
Post by Luke Kenneth Casson Leighton
BOM and schematic PDF are here, review appreciated.
Forbidden
You don't have permission to access
/~lkcl/eoma/microdesktop/microdesktop.pdf on this server.
sorted.
Post by Stéphane Goujet
Goodbye,
Stéphane.
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Stéphane Goujet
2014-05-30 11:31:05 UTC
Permalink
Post by Luke Kenneth Casson Leighton
On Thu, May 29, 2014 at 11:20 PM, Stéphane Goujet
Post by Stéphane Goujet
Post by Luke Kenneth Casson Leighton
BOM and schematic PDF are here, review appreciated.
You don't have permission to access
sorted.
Thanks.

A few quick remarks:

*1* ACIN: should be renamed DCIN, I guess.

*2* PW_EN: when connected to U9 its wire has an output symbol. It should
be an input symbol.

*3* PW_EN: not generated anywhere yet.

*4* resistors around U9: R53 and R54 have very high values (they are
usually chosen around the range 10k-100k, not 100k-1M). Was there an
advise to do so, or a reference design doing so ?

*5* RESET circuit: I do not quite understand it. First, because VCC-3V3
depends on PW_EN (U9 switching regulator). Second, because you seem to
assert RESET (RESET#=0) when PW_EN==1: is this what you really want ?
Third, because... what is RESET# used for ?


Or did you believe EN was an output of SY8008B ? That would explain
remarks 2, 3 and 5. But it is an input.



Goodbye,
Stéphane.
Luke Kenneth Casson Leighton
2014-05-30 11:49:01 UTC
Permalink
On Fri, May 30, 2014 at 12:31 PM, Stéphane Goujet
Post by Stéphane Goujet
Post by Luke Kenneth Casson Leighton
On Thu, May 29, 2014 at 11:20 PM, Stéphane Goujet
Post by Stéphane Goujet
Post by Luke Kenneth Casson Leighton
BOM and schematic PDF are here, review appreciated.
You don't have permission to access
sorted.
Thanks.
*1* ACIN: should be renamed DCIN, I guess.
yes.
Post by Stéphane Goujet
*2* PW_EN: when connected to U9 its wire has an output symbol. It should be
an input symbol.
the whole power enable and reset is up for grabs at the moment
because it is tied to the modifications that are needed for the CPU
Card and the EOMA68 interface.

so, RESET will be renamed "power on" and will get connected directly
to the EOMA68 interface, on HIGH and connected to one of the 5V lines
behind a resistor so that things don't go totally tits-up if people
use the Revision 1 CPU cards.

more later.

l.
Luke Kenneth Casson Leighton
2014-06-15 10:07:54 UTC
Permalink
On Fri, May 30, 2014 at 12:31 PM, Stéphane Goujet
Post by Stéphane Goujet
Post by Luke Kenneth Casson Leighton
On Thu, May 29, 2014 at 11:20 PM, Stéphane Goujet
Post by Stéphane Goujet
Post by Luke Kenneth Casson Leighton
BOM and schematic PDF are here, review appreciated.
You don't have permission to access
sorted.
Thanks.
*1* ACIN: should be renamed DCIN, I guess.
*2* PW_EN: when connected to U9 its wire has an output symbol. It should be
an input symbol.
*3* PW_EN: not generated anywhere yet.
*4* resistors around U9: R53 and R54 have very high values (they are usually
chosen around the range 10k-100k, not 100k-1M). Was there an advise to do
so, or a reference design doing so ?
finally got round to looking at this, yes it's the reference design.
the values are chosen to give the voltage required, there is a table
(and a calculation) in the ref. design.
Post by Stéphane Goujet
*5* RESET circuit: I do not quite understand it. First, because VCC-3V3
depends on PW_EN (U9 switching regulator). Second, because you seem to
assert RESET (RESET#=0) when PW_EN==1: is this what you really want ? Third,
because... what is RESET# used for ?
i'm going to remove it. poweroff will be "reset".

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