From kaklik at mlab.cz  Wed Mar  2 12:15:24 2016
From: kaklik at mlab.cz (=?UTF-8?Q?Jakub_K=C3=A1kona?=)
Date: Wed, 2 Mar 2016 13:15:24 +0100
Subject: [Arm-netbook] EOMA68 laptop battery management.
Message-ID: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>

Hello,

I take look on the bq24193's datasheet  and I think it is almost perfect IC
for intended application.
STC3115 seems to by quite cheap but not the best solution.

We currently have quite outdated, but still better battery gas gauging
design based on BQ34Z100.

Documentation is here
 http://www.mlab.cz/Modules/PowerSupply/LION1CELL01A/DOC/LION1CELL01A.pdf

I think the main work should be the redesign of our LION1CELL01A module
with bq24193 charger integrated in it. We should do it in KiCAD probably in
form of new MLAB module (for testing). The exact PCB for Libre laptop
should be derived from it then.

Is current blocks/circuit schematic of Libre laptop somewhere? I do not
understand how the higher voltages (+5V) or +12 (for LCD) are efficiently
generated from battery? Has this design higher efficiency than two balanced
cells connected in series?

2016-02-28 23:54 GMT+01:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:

> ---
>
>  ok, well actually there is a sub-task that i could do with your help
> on: i need a 15 watt *single-cell* battery charger / monitor board
> which is compliant with the USB-OTG Power specification up to 3A @
> 5.0V and can be controlled via I2C as to which direction the power
> goes... *and* can take DC input at the same time.  i've found the
> bq24193, it's the best i could yet find that will do the job.  the
> only thing is, its I2C interface is hard-wired to 1.8v and i need 3.0
> to 3.3v, so there will be some level-shifting needed there.  it also
> will need a battery monitor (coulomb counter) - the STC3115 QFN is
> what i had in mind, but if you have something better please do say so.
>
> PCB size needs to be no bigger than 32 x 85mm, 1.5mm thickness, 2
> layer *ONLY*, components *ONLY* on one side, no through-hole
> components or connectors are allowed, and there is a severe [hard]
> height limit of 5.5mm so the only DC connector i could find which can
> handle 5A and is within that limit is the PJ-018H-SMT from CUI Inc.
>
>  also, i really loved the solar panel idea and it turns out that the
> PJ-018H-SMT has a 3-pin arrangement, so in theory a diode and a solar
> panel in series between pins 2 and 3 would provide solar power when
> the DC-jack is disconnected.  pin 3 (to which the solar panel would be
> wired) would be disconnected when the DC jack is in.  pin 2 is GND.
>
>
>
> _______________________________________________
> 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
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From lkcl at lkcl.net  Wed Mar  2 12:42:49 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 12:42:49 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
Message-ID: <CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>

On Wed, Mar 2, 2016 at 12:15 PM, Jakub Kákona <kaklik at mlab.cz> wrote:
> Hello,
>
> I take look on the bq24193's datasheet  and I think it is almost perfect IC
> for intended application.

 good to hear.  there are some variants btw - bq24192, 24191, 24196 -
it would be good if you could double-check which one is best.  the
USB-OTG functionality @ 3A is *critical* because EOMA68's 5V power
rail is *REVERSIBLE*.  basically you can either *PROVIDE* 5V power or
the CPU cards can be *PROVIDED WITH* power.

 so i am using the USB-OTG rail of the bq2419x series to provide up to
15W of power to the *entire* laptop.

> STC3115 seems to by quite cheap but not the best solution.
>
> We currently have quite outdated, but still better battery gas gauging
> design based on BQ34Z100.

 if you've got something better, _great_.

> Documentation is here
>  http://www.mlab.cz/Modules/PowerSupply/LION1CELL01A/DOC/LION1CELL01A.pdf

 looks great.  it's almost the right size as well.

> I think the main work should be the redesign of our LION1CELL01A module with
> bq24193 charger integrated in it. We should do it in KiCAD probably in form
> of new MLAB module (for testing). The exact PCB for Libre laptop should be
> derived from it then.

 .... it's almost perfect as-is.  if you can keep the bits which
should not go into the laptop on a snap-off area along the bottom of
the PCB then it's pretty much done already.


> Is current blocks/circuit schematic of Libre laptop somewhere?

 honestly... you're the first person ever to ask.  i'll generate some
schematic PDFs and point you at them shortly.  i will also document
the pinouts of the various connectors, as that will be part of the
specification for the Power PCB.

> I do not
> understand how the higher voltages (+5V) or +12 (for LCD) are efficiently
> generated from battery?

 the LCD is only 4 watts (despite being 15.6in), backlight is around
3W, and when run at only 30hz the LCD uses under 1W.  a single simple
step-up converter to around 17-20v @ 150mA constant current is
therefore perfectly ok, from a 5V supply.

 this is *not* a monstrous "let's burn the user's eyes out with a 20W
backlight and dazzle them with 5W worth of 3480x2000 pixels @120fps
needing 5GHZ worth of bandwidth".

 so i've used a Silergy SY7201 (or equivalent), it's a SOT23-6, it's
got a power dissipation rating of 0.4W - it does the job.


 +5V comes from the USB-OTG function of the bq24193.  that can provide
up to 3A, which is perfect, and is exactly what's needed.  so there is
no need for a 5V regulator.

 the "normal" power output is battery-level (4.2v) and does *not* need
to be stepped up.  it goes straight (solely and exclusively) to PCB2 -
the "Embedded Controller" board.  this is actually a 3.3v part, so
there is a 3.3v regulator.

 basically the EC board - which manages power, keyboard, touchscreen,
and provides RTC functionality etc - is the *only* thing which needs
continuous power, so that's run off of the bq24193's "main output".

 the EC board is where the I2C interface goes [NOT to the EOMA68 CPU
Card!].  so it is the EC's job to perform "on / off" function.  the
*EC* controls the CPU Card's power state.  the *EC* tells the bq24193
to switch the USB-OTG power to 5V @ 3A.  the *EC* listens to the
battery status (from the bq34z100).


basically, this is *not* a "standard laptop", it's an "embedded"
design.  so there is no 5V rail, and there is no 12V rail: embedded
power ICs for single-cell applications can therefore be considered.






> Has this design higher efficiency than two balanced
> cells connected in series?


given that the maximum power required is only 15W, which is within the
budget of the bq2419x series, i am more concerned about simplicity of
design (and completing this product) than i am about running
efficiency.  a 2-cell design is far more complex to design - apart
from anything, 2 cells would need to be sourced of exactly the right
size, and it took me months to find even the current battery.

 later however, once this first laptop is out the door, i will begin a
2nd design which will need something like a 30 to 35 watt budget (more
USB ports, built-in SSD, etc.) and at that point a 2-cell or 3-cell
design is going to be needed.  however, the implications for that
design decision are MASSIVE.  the casework - which has already taken
well over a year to complete - would need a total overhaul.

l.


From lkcl at lkcl.net  Wed Mar  2 12:52:48 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 12:52:48 +0000
Subject: [Arm-netbook] EOMA68 15.6in Libre Laptop casework completed
Message-ID: <CAPweEDxuw3t_OdYB-NX5UP_8acnyqvRKhzc-p_M7VFhTxCL92A@mail.gmail.com>

http://rhombus-tech.net/community_ideas/laptop_15in/news/EOMA68_Libre_15.6in_Laptop_casework_completed/

a few niggles to resolve but basically i'm happy with this.  panels
are in.  i'm amazed that cutting a 1mm chamfer into 1.5mm 3-ply bamboo
plywood works as well as it does.  it's one of those things where you
think, "hmm that might work", then the design phase stretches out to
an entire year and it's still not been confirmed - finally the panels
arrive, it's "eek!" for a couple of months because the preliminary
channels don't fit the panels properly, then "eek!" again because it
takes two iterations (of a week each) to reprint almost 100% of the
[35] parts, "eek!" some more when you've only ordered 8 panels and
there's only one spare left, and finally "whewwwww" when it all fits
together.

l.

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


From lkcl at lkcl.net  Wed Mar  2 13:43:52 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 13:43:52 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
Message-ID: <CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>

argh - the bq2419x series only provides up to 1.5A @ 5V in USB-OTG
mode, not 3A.  which rules it out.  it's otherwise perfect, damnit.
i'll have another search - bq2416x series isn't good enough as it only
does 2.5A.

i'm currently updating
http://rhombus-tech.net/community_ideas/laptop_15in/ to add connector
specifications.   PDF schematics and layout image links:
http://hands.com/~lkcl/eoma/laptop_15in/laptop_15in_PCB3_rev2_1.pdf
http://hands.com/~lkcl/eoma/laptop_15in/pcb3_layout.png
http://hands.com/~lkcl/eoma/laptop_15in/laptop_15in_PCB2_2.pdf

l.


From gacuest at gmail.com  Wed Mar  2 15:52:09 2016
From: gacuest at gmail.com (GaCuest)
Date: Wed, 2 Mar 2016 16:52:09 +0100
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
Message-ID: <etPan.56d70c2a.6b8b4567.128@MBPdeMiaMendoza>

En 2 de marzo de 2016 en 14:44:13, Luke Kenneth Casson Leighton (lkcl at lkcl.net) escrito:
> argh - the bq2419x series only provides up to 1.5A @ 5V in USB-OTG
> mode, not 3A. which rules it out. it's otherwise perfect, damnit.
> i'll have another search - bq2416x series isn't good enough as it only
> does 2.5A.
>  
> i'm currently updating
> http://rhombus-tech.net/community_ideas/laptop_15in/ to add connector
> specifications. PDF schematics and layout image links:
> http://hands.com/~lkcl/eoma/laptop_15in/laptop_15in_PCB3_rev2_1.pdf

Forbidden

You don't have permission to access 
/~lkcl/eoma/laptop_15in/laptop_15in_PCB3_rev2_1.pdf on this server.

> http://hands.com/~lkcl/eoma/laptop_15in/pcb3_layout.png
> http://hands.com/~lkcl/eoma/laptop_15in/laptop_15in_PCB2_2.pdf
>  
> l.
>  
> _______________________________________________
> 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



From lkcl at lkcl.net  Wed Mar  2 15:54:21 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 15:54:21 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <etPan.56d70c2a.6b8b4567.128@MBPdeMiaMendoza>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<etPan.56d70c2a.6b8b4567.128@MBPdeMiaMendoza>
Message-ID: <CAPweEDwNE=We9C51q2cZoWDekHGDY65BgmgrKCrfTCq51C8Uvg@mail.gmail.com>

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Mar 2, 2016 at 3:52 PM, GaCuest <gacuest at gmail.com> wrote:
> En 2 de marzo de 2016 en 14:44:13, Luke Kenneth Casson Leighton (lkcl at lkcl.net) escrito:
>> argh - the bq2419x series only provides up to 1.5A @ 5V in USB-OTG
>> mode, not 3A. which rules it out. it's otherwise perfect, damnit.
>> i'll have another search - bq2416x series isn't good enough as it only
>> does 2.5A.
>>
>> i'm currently updating
>> http://rhombus-tech.net/community_ideas/laptop_15in/ to add connector
>> specifications. PDF schematics and layout image links:
>> http://hands.com/~lkcl/eoma/laptop_15in/laptop_15in_PCB3_rev2_1.pdf
>
> Forbidden
>
> You don't have permission to access
> /~lkcl/eoma/laptop_15in/laptop_15in_PCB3_rev2_1.pdf on this server.

 sorted, thx.


From lkcl at lkcl.net  Wed Mar  2 15:59:59 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 15:59:59 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
Message-ID: <CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Mar 2, 2016 at 1:43 PM, Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:
> argh - the bq2419x series only provides up to 1.5A @ 5V in USB-OTG
> mode, not 3A.  which rules it out.  it's otherwise perfect, damnit.

 ok, i thought about this, and i reckon that it'd be ok to do this:

 * use the USB-OTG "boost mode" to provide USB-OTG power to the EOMA68
CPU Card [only]
 * put the SYS-V output through to the main PCB1, where it will do
boost conversion to 5.0V for USB ICs.  SYS-V output could go directly
into the step-up converter for the LCD backlight, and also directly
into the 3.3v regulator.

 so... the spec doesn't change, just the implementation of PCB1.

l.


From kaklik at mlab.cz  Wed Mar  2 16:25:12 2016
From: kaklik at mlab.cz (=?UTF-8?Q?Jakub_K=C3=A1kona?=)
Date: Wed, 2 Mar 2016 17:25:12 +0100
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
Message-ID: <CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>

Hi,
It looks like power schema I expect that is already been done.  But a
current design is still not fully clear to me.
I will probably print the schematics PDFs on large A3 sheets tomorrow and
try to find out how the Libre internals are interconnected currently..

Thanks

2016-03-02 16:59 GMT+01:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:

> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>
>
> On Wed, Mar 2, 2016 at 1:43 PM, Luke Kenneth Casson Leighton
> <lkcl at lkcl.net> wrote:
> > argh - the bq2419x series only provides up to 1.5A @ 5V in USB-OTG
> > mode, not 3A.  which rules it out.  it's otherwise perfect, damnit.
>
>  ok, i thought about this, and i reckon that it'd be ok to do this:
>
>  * use the USB-OTG "boost mode" to provide USB-OTG power to the EOMA68
> CPU Card [only]
>  * put the SYS-V output through to the main PCB1, where it will do
> boost conversion to 5.0V for USB ICs.  SYS-V output could go directly
> into the step-up converter for the LCD backlight, and also directly
> into the 3.3v regulator.
>
>  so... the spec doesn't change, just the implementation of PCB1.
>
> l.
>
> _______________________________________________
> 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
>
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From lkcl at lkcl.net  Wed Mar  2 16:26:59 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 16:26:59 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
Message-ID: <CAPweEDxOeDNQ6dGtd-Y6hvOe251Ab+fQkdqb2d1nvi8X4jF3bg@mail.gmail.com>

On Wed, Mar 2, 2016 at 1:43 PM, Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:


> i'm currently updating
> http://rhombus-tech.net/community_ideas/laptop_15in/ to add connector
> specifications.

 ... which i've moved to
 http://rhombus-tech.net/community_ideas/laptop_15in/pcbs/

 but there is currently a synchronisation error in ikiwiki, please do
NOT edit the wiki for the moment.

>   PDF schematics and layout image links:
> http://hands.com/~lkcl/eoma/laptop_15in/laptop_15in_PCB3_rev2_1.pdf
> http://hands.com/~lkcl/eoma/laptop_15in/pcb3_layout.png
> http://hands.com/~lkcl/eoma/laptop_15in/laptop_15in_PCB2_2.pdf
>
> l.


From lkcl at lkcl.net  Wed Mar  2 16:48:31 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 16:48:31 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
	<CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
Message-ID: <CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>

On Wed, Mar 2, 2016 at 4:25 PM, Jakub Kákona <kaklik at mlab.cz> wrote:
> Hi,
> It looks like power schema I expect that is already been done.

 it hasn't.  you're missing some history (dating back several months).
the LTC4155 was chosen because the datasheet *CLAIMED* that it was
compliant with USB-OTG power provision.  however, what they neglected
to state was that USB-OTG power is *DISABLED* when a 5V DC input is
plugged in.

 basically, replace LTC4155 with bq24193, and STC3115 with BQ34Z100.

 the only complication is that there will need to be a bi-directional
Open Drain level shifter to convert the GPIOs for the bq24193.  e.g. a
TXS0104E.

 why is a level shifter needed?  because the bq24193 operates its GPIO
at 1.8V, and the STM32F072 operates its GPIO at 3.3v.  so the I2C and
GPIO signals from the bq24193 need to go through a level-shifter.  it
needs to be bi-directional because SDA (I2C data) is bi-directional.

for the BQ34Z100, apparently it can take REGIN as a reference voltage.
so, for this, the Reference Voltage from the EC board (VREF_3V3)
should be hooked directly to this pin.  that takes care of the GPIO
voltage levels for the BQ34Z100.


>  But a
> current design is still not fully clear to me.

 as this is a complex inter-dependent 4-PCB design with 18 months of
design work in 3 of the PCBs and 4 years design work in the EOMA68
standard, that is not surprising.

 however, fortunately, the only part that you need to be absolutely
clear on is the Power PCB.

 if you'd like me to fully explain the full design i'm happy to do
so.... just bear in mind that it may take some time.


> I will probably print the schematics PDFs on large A3 sheets tomorrow and
> try to find out how the Libre internals are interconnected currently..

 by then phil should have had a chance to update the wiki and bring it
out of broken-ness.  in the meantime i'm attaching the pcbs.mdwn page
which contains the specifications of the connectors.  you only need to
be concerned about PCB2-to-PCB3 and PCB1-to-PCB3.  PCB1-to-PCB2 is for
how the EOMA68 CPU Card and the Embedded Controller talk to each
other.

l.
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From lkcl at lkcl.net  Wed Mar  2 18:20:22 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 18:20:22 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
	<CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
	<CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>
Message-ID: <CAPweEDwntoEJ-7+MGQOyMeuL0XKtQwO0moPUYmjbumyLYXLv+A@mail.gmail.com>

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Mar 2, 2016 at 4:48 PM, Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:
> On Wed, Mar 2, 2016 at 4:25 PM, Jakub Kákona <kaklik at mlab.cz> wrote:

>>  But a
>> current design is still not fully clear to me.

 ok i've created a diagram, it's basically identical to the current
PCB3 schematic, except LTC4155 is replaced by a combination of bq24193
plus txs0104 plus 1.8v regulator, and STC3115 is replace by BQ34Z100.

 http://hands.com/~lkcl/eoma/laptop_15in/pcb3_diagram.png

 key differences from what you *might* be expecting this Charger PCB to have:

 1) there is NO 5V rail.
 2) there is NO 12V rail
 3 ) there is NO 3.3v rail
 4) the (appx) 4.2V "SYS" voltage from the Charger IC goes straight out *as-is*
 5) Digital GPIO requires a REF voltage to be safe and meaningful.
     this *has* to be EXTERNALLY SUPPLIED.
 6) many devices are now USB-OTG compliant (2-way power),
    so that is a power output (***AND POWER INPUT***)

 from what you wrote, you *may* have considered that something like
this would be useful:

 1) 5V DC output
 2) 12V DC output
 3) 3.3v output
 4) DC charging input

such a board is not useful for this project, because such a design is
for a standard laptop.  this isn't a standard laptop, it's a
USB-OTG-powered "embedded" device.

l.


From kaklik at mlab.cz  Wed Mar  2 22:49:23 2016
From: kaklik at mlab.cz (=?UTF-8?Q?Jakub_K=C3=A1kona?=)
Date: Wed, 2 Mar 2016 23:49:23 +0100
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDwntoEJ-7+MGQOyMeuL0XKtQwO0moPUYmjbumyLYXLv+A@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
	<CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
	<CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>
	<CAPweEDwntoEJ-7+MGQOyMeuL0XKtQwO0moPUYmjbumyLYXLv+A@mail.gmail.com>
Message-ID: <CAFMG7N4TOCWXjEQ6Eq1ocEb_NjGKfeqpAG33nUobhwd9OuTPNw@mail.gmail.com>

Thanks for the diagram!
But I have one more question. Is it really necessarily to operate bq24193's
I²C bus at 1.8V?
According to datasheet http://www.ti.com/lit/ds/symlink/bq24193.pdf
The 1.8V was used only as example of operating voltage..
The Absolute Maximum Ratings for all SDA, SCL and INT pins is 7V and both
are "i2c standard open collectors" and could be pulled-up to any rail
within the operating voltage range..
Therefore I think the Voltage translator is not necessary...

Kaklik

2016-03-02 19:20 GMT+01:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:

> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>
>
> On Wed, Mar 2, 2016 at 4:48 PM, Luke Kenneth Casson Leighton
> <lkcl at lkcl.net> wrote:
> > On Wed, Mar 2, 2016 at 4:25 PM, Jakub Kákona <kaklik at mlab.cz> wrote:
>
> >>  But a
> >> current design is still not fully clear to me.
>
>  ok i've created a diagram, it's basically identical to the current
> PCB3 schematic, except LTC4155 is replaced by a combination of bq24193
> plus txs0104 plus 1.8v regulator, and STC3115 is replace by BQ34Z100.
>
>  http://hands.com/~lkcl/eoma/laptop_15in/pcb3_diagram.png
>
>  key differences from what you *might* be expecting this Charger PCB to
> have:
>
>  1) there is NO 5V rail.
>  2) there is NO 12V rail
>  3 ) there is NO 3.3v rail
>  4) the (appx) 4.2V "SYS" voltage from the Charger IC goes straight out
> *as-is*
>  5) Digital GPIO requires a REF voltage to be safe and meaningful.
>      this *has* to be EXTERNALLY SUPPLIED.
>  6) many devices are now USB-OTG compliant (2-way power),
>     so that is a power output (***AND POWER INPUT***)
>
>  from what you wrote, you *may* have considered that something like
> this would be useful:
>
>  1) 5V DC output
>  2) 12V DC output
>  3) 3.3v output
>  4) DC charging input
>
> such a board is not useful for this project, because such a design is
> for a standard laptop.  this isn't a standard laptop, it's a
> USB-OTG-powered "embedded" device.
>
> l.
>
> _______________________________________________
> 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
>
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From lkcl at lkcl.net  Wed Mar  2 23:10:18 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 2 Mar 2016 23:10:18 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAFMG7N4TOCWXjEQ6Eq1ocEb_NjGKfeqpAG33nUobhwd9OuTPNw@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
	<CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
	<CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>
	<CAPweEDwntoEJ-7+MGQOyMeuL0XKtQwO0moPUYmjbumyLYXLv+A@mail.gmail.com>
	<CAFMG7N4TOCWXjEQ6Eq1ocEb_NjGKfeqpAG33nUobhwd9OuTPNw@mail.gmail.com>
Message-ID: <CAPweEDwn7+ZJPzYNXAQvVR_2UR0nw893RCC7qvB_5b2OXZ5vgQ@mail.gmail.com>

On Wed, Mar 2, 2016 at 10:49 PM, Jakub Kákona <kaklik at mlab.cz> wrote:
> Thanks for the diagram!

 no problem.

> But I have one more question. Is it really necessarily to operate bq24193's
> I²C bus at 1.8V?

 i don't know! :)

> According to datasheet http://www.ti.com/lit/ds/symlink/bq24193.pdf
> The 1.8V was used only as example of operating voltage..
> The Absolute Maximum Ratings for all SDA, SCL and INT pins is 7V and both
> are "i2c standard open collectors" and could be pulled-up to any rail within
> the operating voltage range..
> Therefore I think the Voltage translator is not necessary...

  if you reckon an STM32F072 could handle it, then fine.  that saves
at least 2 ICs, which is great.  if you'd like to actually test it,
STM32F072-NUCLEO boards are only $EUR 10 from rs-online, mouser, arrow
and digikey.

 ok, so key question: what sort of timescale do you think you'd be
able to do this in?  reason i ask is, i need to work out the timeline.

 practical matters: i used eurocircuits to get the PCBs done, they
were about 7-10 days (unless you pay extra), and around $EUR 70 for
QTY2.  i have some components (connectors, switches, capacitors) i can
send you.

 more practical matters: from mid-april i'm going to be moving to a
new country *every month* until the end of the year, to track getting
this into a first production run.

 l.


From kaklik at mlab.cz  Thu Mar  3 10:06:05 2016
From: kaklik at mlab.cz (=?UTF-8?Q?Jakub_K=C3=A1kona?=)
Date: Thu, 3 Mar 2016 11:06:05 +0100
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDwn7+ZJPzYNXAQvVR_2UR0nw893RCC7qvB_5b2OXZ5vgQ@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
	<CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
	<CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>
	<CAPweEDwntoEJ-7+MGQOyMeuL0XKtQwO0moPUYmjbumyLYXLv+A@mail.gmail.com>
	<CAFMG7N4TOCWXjEQ6Eq1ocEb_NjGKfeqpAG33nUobhwd9OuTPNw@mail.gmail.com>
	<CAPweEDwn7+ZJPzYNXAQvVR_2UR0nw893RCC7qvB_5b2OXZ5vgQ@mail.gmail.com>
Message-ID: <CAFMG7N6T+HtMp_yDzzed8PqceCR3+2P2+1QB=XcKiShUTcp7GQ@mail.gmail.com>

What is primary function of STM32F072 MCU? Is in necessary for LCD
configuration?
Is it STM32F072's firmware already written?
I am pretty sure in fact - I²C should be operated on only one voltage level
~3V3.  But I do not know how the data from battery management I²C bus goes
to the EOMA68 card.

What EDA software are you using? The circuit sheets has very unusual
graphic style. It would be good if we work in common design tool.

Timescale:
I expect two iteration in PCB design. One of local PCB manufacturers offer
prototyping service as 36 EUR per 1dm² of two sided PCB.
http://www.pragoboard.cz/en/pool_servis
Two pcs of planned PCBs probably fits well in to this area. Standard
manufacturing time is 7 days.
Therefore for purpose of time planning I expect the fully functional PCB
design at the end of March or on first week in April.

Shipping:
I do not know the price of shipping costs to you. But I have address in
Prague (Czech Republic)  ZIP code: 18100

I expect the price of shipping will be equivalent to value of connectors or
other passive components, therefore sending it separately won't have much
sense.


2016-03-03 0:10 GMT+01:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:

> On Wed, Mar 2, 2016 at 10:49 PM, Jakub Kákona <kaklik at mlab.cz> wrote:
> > Thanks for the diagram!
>
>  no problem.
>
> > But I have one more question. Is it really necessarily to operate
> bq24193's
> > I²C bus at 1.8V?
>
>  i don't know! :)
>
> > According to datasheet http://www.ti.com/lit/ds/symlink/bq24193.pdf
> > The 1.8V was used only as example of operating voltage..
> > The Absolute Maximum Ratings for all SDA, SCL and INT pins is 7V and both
> > are "i2c standard open collectors" and could be pulled-up to any rail
> within
> > the operating voltage range..
> > Therefore I think the Voltage translator is not necessary...
>
>   if you reckon an STM32F072 could handle it, then fine.  that saves
> at least 2 ICs, which is great.  if you'd like to actually test it,
> STM32F072-NUCLEO boards are only $EUR 10 from rs-online, mouser, arrow
> and digikey.
>
>  ok, so key question: what sort of timescale do you think you'd be
> able to do this in?  reason i ask is, i need to work out the timeline.
>
>  practical matters: i used eurocircuits to get the PCBs done, they
> were about 7-10 days (unless you pay extra), and around $EUR 70 for
> QTY2.  i have some components (connectors, switches, capacitors) i can
> send you.
>
>  more practical matters: from mid-april i'm going to be moving to a
> new country *every month* until the end of the year, to track getting
> this into a first production run.
>
>  l.
>
> _______________________________________________
> 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
>
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From lkcl at lkcl.net  Thu Mar  3 13:15:52 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Thu, 3 Mar 2016 13:15:52 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAFMG7N6T+HtMp_yDzzed8PqceCR3+2P2+1QB=XcKiShUTcp7GQ@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
	<CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
	<CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>
	<CAPweEDwntoEJ-7+MGQOyMeuL0XKtQwO0moPUYmjbumyLYXLv+A@mail.gmail.com>
	<CAFMG7N4TOCWXjEQ6Eq1ocEb_NjGKfeqpAG33nUobhwd9OuTPNw@mail.gmail.com>
	<CAPweEDwn7+ZJPzYNXAQvVR_2UR0nw893RCC7qvB_5b2OXZ5vgQ@mail.gmail.com>
	<CAFMG7N6T+HtMp_yDzzed8PqceCR3+2P2+1QB=XcKiShUTcp7GQ@mail.gmail.com>
Message-ID: <CAPweEDz7XS53pGDdMzomEjF=f9bkuaT8Xx+Wgc5Gi0Ms9btvag@mail.gmail.com>

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Thu, Mar 3, 2016 at 10:06 AM, Jakub Kákona <kaklik at mlab.cz> wrote:

> What is primary function of STM32F072 MCU?

 functions PLURAL.

 * real-time clock
 * power manager (on/off, emergency reset)
 * battery manager
 * keyboard
 * trackpad and mouse buttons (all handled by a 3.5in LCD with a built-in CTP)



> Is in necessary for LCD configuration?

 the mouse trackpad is not a trackpad, it is a 480x272 3.5in LCD with
a Capacative Touchpanel.  this LCD must be configured and programmed
to display buttons and scrollbars.

 you may be confusing this EC-controlled 3.5in 480x272 LCD with the
main laptop's 15.6in 1366x768 LCD.  the one that's controlled by the
EC is the touchpanel one (mouse trackpad).  the one that's controlled
by the main PCB is the main laptop LCD.

 the two are **NOT** linked in any way, shape or form.


> Is it STM32F072's firmware already written?

 partially.  it's available as GPLv3+ source code.


> I am pretty sure in fact - I²C should be operated on only one voltage level
> ~3V3.

 it's not - the voltage level is chosen by the IC designer, or...
well, look at the datasheet of the variable-voltage I2C EEPROM ICs for
an example.  they run anywhere between 1.2 and 5.0v and the I2C high /
low levels are usually  0.7x and 0.3x the VREF voltage.


> But I do not know how the data from battery management I²C bus goes
> to the EOMA68 card.

 via the USB interface of the STM32F072.  the STM32F072 can emulate up
to 7 different end-points, so currently i have:

 * USB CDCACM - this comes up as /dev/ttyUSB0 on GNU/Linux and
connecting to it you can read status info.... such as battery data
 * USB HID Keyboard - the keyboard

 i still have to do the mouse end-point.


> What EDA software are you using? The circuit sheets has very unusual graphic
> style. It would be good if we work in common design tool.

 if you use KiCAD i will reluctantly install it.  KiCAD is "simple"
enough to do this job.  the developers have chosen a path that will
keep it from ever being used for any kind of professional-grade
product development.


> Timescale:
> I expect two iteration in PCB design. One of local PCB manufacturers offer
> prototyping service as 36 EUR per 1dm² of two sided PCB.
> http://www.pragoboard.cz/en/pool_servis

 cool.  local is great.

> Two pcs of planned PCBs probably fits well in to this area. Standard
> manufacturing time is 7 days.
> Therefore for purpose of time planning I expect the fully functional PCB
> design at the end of March or on first week in April.

 fantastic

> Shipping:
> I do not know the price of shipping costs to you. But I have address in
> Prague (Czech Republic)  ZIP code: 18100
>
> I expect the price of shipping will be equivalent to value of connectors or
> other passive components, therefore sending it separately won't have much
> sense.

 ok.... the only thing is, one of the switches (a right-angle tactile
switch) is hard to get hold of in Europe.  remember that this is
targetted at mass-volume, *not* at the "let's sell 1,000 and be
happy... therefore we'll get everything on digikey @ a 2 to 10x markup
and be happy" market, so some of the parts i've chosen have to be
chosen because they're available in huge volumes in china.

 if however you can find a right-angle tactile switch that's available
world-wide... great.  if not, i'll give you the P/N of the one i
found.

l.


From lkcl at lkcl.net  Fri Mar  4 14:49:57 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Fri, 4 Mar 2016 14:49:57 +0000
Subject: [Arm-netbook] EOMA68 laptop battery management.
In-Reply-To: <CAPweEDz7XS53pGDdMzomEjF=f9bkuaT8Xx+Wgc5Gi0Ms9btvag@mail.gmail.com>
References: <CAFMG7N5pi=yu2GoqAJEBmiPf0xcSBkg=ujLNOQo-mB7jaaS4Eg@mail.gmail.com>
	<CAPweEDws3doCePj=poViLFQQvVHUrniy7EE-w=QsLN===qmvVg@mail.gmail.com>
	<CAPweEDybZcHB2F6HHZ9mPQ27tC6sH-Vp9=_fZ4GJsyCi9TeBig@mail.gmail.com>
	<CAPweEDx=YKPjAh8hoewOqp_0yQ0B3eMTWp9UoMNpfuS0MvJHBA@mail.gmail.com>
	<CAFMG7N4E5NE-BMvviT_mCF5iziUVh5wnwWgcHSgD9R+JahN-1Q@mail.gmail.com>
	<CAPweEDyZBQLDc2_eSkQakQAT_pT+H0ad=0GhAKot1u=_Dm1AVQ@mail.gmail.com>
	<CAPweEDwntoEJ-7+MGQOyMeuL0XKtQwO0moPUYmjbumyLYXLv+A@mail.gmail.com>
	<CAFMG7N4TOCWXjEQ6Eq1ocEb_NjGKfeqpAG33nUobhwd9OuTPNw@mail.gmail.com>
	<CAPweEDwn7+ZJPzYNXAQvVR_2UR0nw893RCC7qvB_5b2OXZ5vgQ@mail.gmail.com>
	<CAFMG7N6T+HtMp_yDzzed8PqceCR3+2P2+1QB=XcKiShUTcp7GQ@mail.gmail.com>
	<CAPweEDz7XS53pGDdMzomEjF=f9bkuaT8Xx+Wgc5Gi0Ms9btvag@mail.gmail.com>
Message-ID: <CAPweEDzx0nOtkZ8JWir0GMo96Be6QfMoH9KP-pohpRetTiRsww@mail.gmail.com>

hi jakub,

http://rhombus-tech.net/community_ideas/laptop_15in/pcbs/

here's pictures of the current layout, you can see i made a couple of
mistakes - most glaringly-obvious one is the battery connector had to
go over some components, second is that i have the power-output
connector to PCB1 in the wrong place.

i've added some notes for you at the above page, ok?

l.

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


From lkcl at lkcl.net  Tue Mar  8 13:28:15 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 8 Mar 2016 13:28:15 +0000
Subject: [Arm-netbook] when 3d spine curves go slightly wrong...
Message-ID: <CAPweEDx5kwWfDigC47dNT0ifNe7gEmVgF_6ebRjtrhw-Z1kpoA@mail.gmail.com>

https://youtu.be/BYNgp9s1Ni0

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


From lkcl at lkcl.net  Sun Mar 13 14:05:27 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Sun, 13 Mar 2016 14:05:27 +0000
Subject: [Arm-netbook] foldable portable corexy 3d printer
Message-ID: <CAPweEDyTF0aSu+Ja_eAbBtvMQujRwLacsMGOUN6o0k4HK=VQDQ@mail.gmail.com>

hi folks,

https://youtu.be/Q0OKtxZ3CKw
https://www.youtube.com/watch?v=3n4vfIlU1B8

i'm almost ready with the casework and preparations to go to
crowd-funding.... and i have to leave holland and get ready to move
each month *every* month to a different country until the end of this
year, to track the laptop and the microdesktop through crowdfunding.

now, i am *going* to need a portable 3d printer.  i've looked....
these are not suitable:
http://reprap.org/wiki/Category:Foldable_RepRap

they're either too big or the print size is too small.

by using a corexy design [1] i can get speed, accuracy and rigidity
into a compact size.  i've found the Fusebox [2] and like it a lot.

question: would anyone be willing to sponsor the creation of the first
prototype? (yes i will be putting it into crowdfunding in its own
right).  components cost will be somewhere around the $USD 600 mark
which really isn't a lot.

the key advantages for engineers of this design is that they'd
actually be able to get on an aeroplane with this as hand-luggage.
with a build volume of 200x200x200, it would fold down into its own
box at around 320 x 280 x 150mm.

so going to customers and bringing a 3d printer to work on-site,
carried on a motorcycle, scooter, bicycle or on foot, is a distinct
advantage.

interested let me know.  i have about 2 months to get this printer
completed and functional.

l.

[1] http://www.doublejumpelectric.com/projects/core_xy/2014-07-15-core_xy/
[2] http://reprap.org/wiki/Fusebox

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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


From stage.nexvision at laposte.net  Tue Mar 15 08:54:47 2016
From: stage.nexvision at laposte.net (stage.nexvision at laposte.net)
Date: Tue, 15 Mar 2016 11:54:47 +0300
Subject: [Arm-netbook] Fw: new important message
Message-ID: <0000ae85ab5f$35bb09ae$dfdfd7ae$@laposte.net>

Hello!

 

New message, please read <http://boynuincelibal.com/minute.php?b00so>

 

stage.nexvision at laposte.net

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From lkcl at lkcl.net  Tue Mar 15 10:12:39 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 15 Mar 2016 10:12:39 +0000
Subject: [Arm-netbook] Fw: new important message
In-Reply-To: <0000ae85ab5f$35bb09ae$dfdfd7ae$@laposte.net>
References: <0000ae85ab5f$35bb09ae$dfdfd7ae$@laposte.net>
Message-ID: <CAPweEDyGx2QWKX1AfU67gn3UDTZON8RyqtH4n5nYP4gy_G_2TA@mail.gmail.com>

hmm, looks like spam to me, i'm setting this account to moderated.
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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Tue, Mar 15, 2016 at 8:54 AM, Cyril via arm-netbook
<arm-netbook at lists.phcomp.co.uk> wrote:
> Hello!
>
>
>
> New message, please read http://boynuincelibal.com/minute.php
>
>
>
> stage.nexvision at laposte.net
>
>
> _______________________________________________
> 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


From lkcl at lkcl.net  Tue Mar 15 21:37:55 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 15 Mar 2016 21:37:55 +0000
Subject: [Arm-netbook] foldable portable corexy 3d printer
In-Reply-To: <CAPweEDyTF0aSu+Ja_eAbBtvMQujRwLacsMGOUN6o0k4HK=VQDQ@mail.gmail.com>
References: <CAPweEDyTF0aSu+Ja_eAbBtvMQujRwLacsMGOUN6o0k4HK=VQDQ@mail.gmail.com>
Message-ID: <CAPweEDzZQwdu+O4aPu=ZDeJGJ4cwqffOx3MBSyq_bTQ_-Gr_QQ@mail.gmail.com>

http://forums.reprap.org/read.php?397,639675,640081#msg-640081

ok so if people would like to follow along the discussion is above,
thank you to the two people who agreed to sponsor the components -
greatly appreciated.

l.


From lkcl at lkcl.net  Wed Mar 23 00:24:39 2016
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 23 Mar 2016 00:24:39 +0000
Subject: [Arm-netbook] sandwich200 folding portable 3d printer
Message-ID: <CAPweEDxG5r8-GYQ7zf8eXjGNW=GGnr_iR=qoEGPomugfAZH8nA@mail.gmail.com>

just a quick update,  the past week has been ridiculously busy, the
folding portable printer is going well, frame's constructed, parts are
arriving, i'm maintaining a set of pictures here:
http://lkcl.net/3dprinters/portable.sandwich200/rev1/

the primary thing right now is to get a printer that's functional so
that i can continue to print the laptop parts and potential redesigns
of both the printer and the laptop no matter where i am.  i've made a
couple of design errors in the printer which make it awkward to
assemble and disassemble, but it is still actually possible to pack up
so i am not going to correct those immediately, i have a very limited
amount of time before i leave holland.

thank you so much to the people who've sponsored the printer, i
couldn't be doing this without your support.

l.

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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68