On Fri, 1 May 2009, Benjamin M. Schwartz wrote:
> John Watlington wrote:
>>> the LED trick has the advantage of not requiring a change to the case,
>>> just a single additional drive pin to be able to run it as a detector.
>>
>> And where would you place said detector LED, without modifying the
>>
On Fri, 1 May 2009, Jameson Quinn wrote:
I like the idea, but wouldn't light transmission inside the case, from the
other LED's, screw this up?
possibly, how much leakage is there between the LEDs?
David Lang
(btw, wikipedia says more light = faster backwards discharge)
Heck, the two sepa
John Watlington wrote:
>> the LED trick has the advantage of not requiring a change to the case,
>> just a single additional drive pin to be able to run it as a detector.
>
> And where would you place said detector LED, without modifying the
> case ?
While we're bikeshedding this to death, I'll
I like the idea, but wouldn't light transmission inside the case, from the
other LED's, screw this up?
(btw, wikipedia says more light = faster backwards discharge)
Heck, the two separate wireless LEDs cause
> more confusion then they're worth anyway, you might as well get rid of
> one and use
On Tue, Apr 28, 2009 at 8:51 PM, John Watlington wrote:
>
> All of our LEDs are dual (one on the inside and one on the outside).
> Instead of running these in parallel, and throwing away the extra
> voltage, I run them in series directly from the battery voltage
> (ever notice that their brightnes
On Tue, Apr 28, 2009 at 8:36 PM, John Watlington wrote:
>
> On Apr 28, 2009, at 8:16 PM, da...@lang.hm wrote:
>
>> On Tue, 28 Apr 2009, John Watlington wrote:
>>
>>> On Apr 28, 2009, at 7:31 PM, da...@lang.hm wrote:
>>>
On Wed, 29 Apr 2009, James Cameron wrote:
> On Tue, Apr 28, 2009 at 1
On Tue, 28 Apr 2009, John Watlington wrote:
> All of our LEDs are dual (one on the inside and one on the outside).
> Instead of running these in parallel, and throwing away the extra
> voltage, I run them in series directly from the battery voltage
> (ever notice that their brightness changes when
All of our LEDs are dual (one on the inside and one on the outside).
Instead of running these in parallel, and throwing away the extra
voltage, I run them in series directly from the battery voltage
(ever notice that their brightness changes when you plug in
the charger ?)
Cheers,
wad
On Apr 28,
On Tue, 28 Apr 2009, John Watlington wrote:
> On Apr 28, 2009, at 8:16 PM, da...@lang.hm wrote:
>
>> On Tue, 28 Apr 2009, John Watlington wrote:
>>
>>> On Apr 28, 2009, at 7:31 PM, da...@lang.hm wrote:
>>>
On Wed, 29 Apr 2009, James Cameron wrote:
> On Tue, Apr 28, 2009 at 10:15:47AM -0
On Apr 28, 2009, at 8:16 PM, da...@lang.hm wrote:
> On Tue, 28 Apr 2009, John Watlington wrote:
>
>> On Apr 28, 2009, at 7:31 PM, da...@lang.hm wrote:
>>
>>> On Wed, 29 Apr 2009, James Cameron wrote:
On Tue, Apr 28, 2009 at 10:15:47AM -0400, C. Scott Ananian wrote:
> I wonder if one coul
On Tue, 28 Apr 2009, da...@lang.hm wrote:
> On Tue, 28 Apr 2009, John Watlington wrote:
>
>> On Apr 28, 2009, at 7:31 PM, da...@lang.hm wrote:
>>
>>> On Wed, 29 Apr 2009, James Cameron wrote:
>>>
On Tue, Apr 28, 2009 at 10:15:47AM -0400, C. Scott Ananian wrote:
> I wonder if one could eas
On Tue, 28 Apr 2009, John Watlington wrote:
> On Apr 28, 2009, at 7:31 PM, da...@lang.hm wrote:
>
>> On Wed, 29 Apr 2009, James Cameron wrote:
>>
>>> On Tue, Apr 28, 2009 at 10:15:47AM -0400, C. Scott Ananian wrote:
I wonder if one could easily support running an LED backwards as an
amb
On Apr 28, 2009, at 7:31 PM, da...@lang.hm wrote:
> On Wed, 29 Apr 2009, James Cameron wrote:
>
>> On Tue, Apr 28, 2009 at 10:15:47AM -0400, C. Scott Ananian wrote:
>>> I wonder if one could easily support running an LED backwards as an
>>> ambient light monitor in Gen 1.5 - it seems that automat
On Wed, 29 Apr 2009, James Cameron wrote:
> On Tue, Apr 28, 2009 at 10:15:47AM -0400, C. Scott Ananian wrote:
>> I wonder if one could easily support running an LED backwards as an
>> ambient light monitor in Gen 1.5 - it seems that automatically
>> powering off the backlight in bright sunlight wo
On Tue, Apr 28, 2009 at 10:15:47AM -0400, C. Scott Ananian wrote:
> I wonder if one could easily support running an LED backwards as an
> ambient light monitor in Gen 1.5 - it seems that automatically
> powering off the backlight in bright sunlight would lead to a lot of
> power savings for most yo
On Sat, Apr 25, 2009 at 12:12 AM, John Watlington wrote:
> This is the current power distribution diagram for A-phase CL1B, identifying
> what we can power, when, and how.
I wonder if one could easily support running an LED backwards as an
ambient light monitor in Gen 1.5 - it seems that automati
On Sat, Apr 25, 2009 at 5:12 AM, John Watlington wrote:
>
> This is the current power distribution diagram for A-phase CL1B,
> identifying
> what we can power, when, and how.
>
> There are several power decisions that I believe need explaining up front:
>
> - The SD slot and USB ports may be powe
Hi,
> perhaps i've been inferring something different than i should
> from wad's initial mail, which said:
>> - The SD slot and USB ports may be powered in suspend
>> This is "just in case" some SD cards or USB devices don't handle
>> being suspended aggressively. We will support
John Watlington wrote:
> On Apr 27, 2009, at 6:11 AM, Joel Stanley wrote:
>
>> Hello Wad,
>>
>> On Sun, Apr 26, 2009 at 12:35, John Watlington wrote:
>>> On Apr 25, 2009, at 7:29 PM, p...@laptop.org wrote:
- will we have (approximate) numbers at some point for how
much power
chris wrote:
> Hi,
>
>> the most likely case i can think of involves being able to allow
>> USB input devices to remain alive during suspend (for wakeup
>> purposes), while powering down other devices (disks?) for power
>> savings.
>
> Hm, I think the USB controller probab
Hi,
> the most likely case i can think of involves being able to allow
> USB input devices to remain alive during suspend (for wakeup
> purposes), while powering down other devices (disks?) for power
> savings.
Hm, I think the USB controller probably turns off by necessity in
suspend,
On Apr 27, 2009, at 6:11 AM, Joel Stanley wrote:
> Hello Wad,
>
> On Sun, Apr 26, 2009 at 12:35, John Watlington wrote:
>>
>> On Apr 25, 2009, at 7:29 PM, p...@laptop.org wrote:
>
>>> - will we have (approximate) numbers at some point for how
>>> much power any given subsystem takes?
Hello Wad,
On Sun, Apr 26, 2009 at 12:35, John Watlington wrote:
>
> On Apr 25, 2009, at 7:29 PM, p...@laptop.org wrote:
>> - will we have (approximate) numbers at some point for how
>> much power any given subsystem takes? (e.g., for the
>> above case, how much would powering d
On Sun, Apr 26, 2009 at 12:40:14AM -0400, Benjamin M. Schwartz wrote:
> Turning off a single port to which nothing is connected saves no power,
> right? I don't see the appeal. [...]
Sorry, perhaps I didn't explain myself adequately.
One of the uses of the laptop is in teaching of electronics a
john wrote:
> Quick straw poll on how many people think it is useful enough
> have individual control over the power supplied to each
> connector to raise the cost of the laptop by $0.15 ?
the most likely case i can think of involves being able to allow
USB input devices to remain alive during
On Sun, 2009-04-26 at 00:40 -0400, Benjamin M. Schwartz wrote:
> John Watlington wrote:
> > Quick straw poll on how many people think it is useful enough have
> > individual control over the power supplied to each connector to raise the
> > cost
> > of the laptop by $0.15 ?
>
> Turning off a
On Apr 26, 2009, at 12:40 AM, Benjamin M. Schwartz wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> John Watlington wrote:
>> Quick straw poll on how many people think it is useful enough have
>> individual
>> control over the power supplied to each connector to raise the cost
>> of t
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
John Watlington wrote:
> Quick straw poll on how many people think it is useful enough have
> individual
> control over the power supplied to each connector to raise the cost
> of the laptop
> by $0.15 ?
Turning off a single port to which nothing
On Apr 25, 2009, at 10:09 PM, James Cameron wrote:
> Reviewed the diagram carefully. The only issue I spotted was that the
> +5VSUS line into the RTC charger comes from a yellow switching voltage
> regulator, despite the RTC charger coloured green. Either it has to
> come from somewhere else, o
On Apr 25, 2009, at 11:04 AM, Nate Ridderman wrote:
> Any chance of getting schematics and PCB files this time around? I
> doubt you renegotiated your contract with Quanta to allow for this,
> but it doesn't hurt to ask.
Doesn't hurt to ask, but Quanta still refuses to release these publicly
On Apr 25, 2009, at 7:29 PM, p...@laptop.org wrote:
> wad wrote:
>>
>> This is the current power distribution diagram for A-phase CL1B,
>> identifying what we can power, when, and how.
>
> wad --
>
> a few questions -- for some i can guess at the answer, but better
> to ask and be sure:
>
> -
Reviewed the diagram carefully. The only issue I spotted was that the
+5VSUS line into the RTC charger comes from a yellow switching voltage
regulator, despite the RTC charger coloured green. Either it has to
come from somewhere else, or the RTC charger has to be yellow, or the
switching regulato
wad wrote:
>
> This is the current power distribution diagram for A-phase CL1B,
> identifying what we can power, when, and how.
wad --
a few questions -- for some i can guess at the answer, but better
to ask and be sure:
- if there are no USB devices inserted, is there an advantage
Benjamin M. Schwartz wrote:
> Richard A. Smith wrote:
> That's not fast enough for much interesting signal processing, but it's
> more than fast enough to do power metering. Power metering while on
> external power is something I've specifically been hoping for.
>
> (So please consider adding th
p...@laptop.org wrote:
> i would think Measure would be more interested in (short-term) averages
> of voltage and current than in seeing power supply noise.
> (will an XO even run properly from an unrectified, or even
> unfiltered, supply?)
Depends. For gen 1.5 we have opened up the front end v
On Sat, Apr 25, 2009 at 10:05 AM, wrote:
> smith wrote:
> > >>> Additional changes from Gen 1 include the ability to both measure
> > >>> DC input current and VIN voltage, as well as EC control over the
> > >>> current drawn from the DC input. The intent was to better support
> > >>> charging
Any chance of getting schematics and PCB files this time around? I doubt you
renegotiated your contract with Quanta to allow for this, but it doesn't
hurt to ask.
Thanks,
Nate
On Sat, Apr 25, 2009 at 12:23 AM, John Watlington wrote:
>
> BTW, Gen 1.5 is the OLPC "codename" for the next revision
Richard A. Smith wrote:
>>> Ideally updates could be frequent enough to pick up a waveform
>>> from an unrectified power supply. (spare audio channel?)
>
> Don't have much in the way of EC cycles available. Don't have much EC
> ram left to cache values either.
>
> I can make the readings availa
smith wrote:
> >>> Additional changes from Gen 1 include the ability to both measure
> >>> DC input current and VIN voltage, as well as EC control over the
> >>> current drawn from the DC input. The intent was to better support
> >>> charging directly from solar panels.
> >> I hope that this w
>>> Additional changes from Gen 1 include the ability to both measure
>>> DC input current and VIN voltage, as well as EC control over the
>>> current drawn from the DC input. The intent was to better support
>>> charging directly from solar panels.
>> I hope that this will be available to activiti
On Apr 25, 2009, at 1:06 AM, Albert Cahalan wrote:
> John Watlington writes:
>
>> - The SD slot and USB ports may be powered in suspend
>> This is "just in case" some SD cards or USB devices don't handle
>> being suspended
>> aggressively. We will support laptop wakeup on interrupt
John Watlington writes:
> - The SD slot and USB ports may be powered in suspend
> This is "just in case" some SD cards or USB devices don't handle
> being suspended
> aggressively. We will support laptop wakeup on interrupt from any
> of these ports (SD or USB). Under software c
BTW, Gen 1.5 is the OLPC "codename" for the next revision of the XO.
The official Quanta model number for the XO was CL1.
The version of the XO with a new touchpad is CL1A.
The Quanta model number for Gen 1.5 is CL1B.
Cheers,
wad
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