Re: CL1B power distribution

2009-05-01 Thread C. Scott Ananian
On Tue, Apr 28, 2009 at 8:51 PM, John Watlington w...@laptop.org 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

Re: CL1B power distribution

2009-05-01 Thread Benjamin M. Schwartz
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 put

Re: CL1B power distribution

2009-05-01 Thread david
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

Re: CL1B power distribution

2009-05-01 Thread david
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 case ?

Re: CL1B power distribution

2009-04-28 Thread C. Scott Ananian
On Sat, Apr 25, 2009 at 12:12 AM, John Watlington w...@laptop.org 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

Re: CL1B power distribution

2009-04-28 Thread James Cameron
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 young

Re: CL1B power distribution

2009-04-28 Thread david
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 would

Re: CL1B power distribution

2009-04-28 Thread John Watlington
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 automatically

Re: CL1B power distribution

2009-04-28 Thread david
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 ambient light

Re: CL1B power distribution

2009-04-28 Thread david
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 easily support running

Re: CL1B power distribution

2009-04-28 Thread david
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 -0400, C. Scott

Re: CL1B power distribution

2009-04-28 Thread John Watlington
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

Re: CL1B power distribution

2009-04-28 Thread david
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

Re: CL1B power distribution

2009-04-27 Thread Joel Stanley
Hello Wad, On Sun, Apr 26, 2009 at 12:35, John Watlington w...@laptop.org 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

Re: CL1B power distribution

2009-04-27 Thread John Watlington
On Apr 27, 2009, at 6:11 AM, Joel Stanley wrote: Hello Wad, On Sun, Apr 26, 2009 at 12:35, John Watlington w...@laptop.org 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?

Re: CL1B power distribution

2009-04-27 Thread Chris Ball
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, as

Re: CL1B power distribution

2009-04-27 Thread pgf
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 probably turns

Re: CL1B power distribution

2009-04-27 Thread Chris Ball
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 laptop

Re: CL1B power distribution

2009-04-27 Thread Tiago Marques
On Sat, Apr 25, 2009 at 5:12 AM, John Watlington w...@laptop.org 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

Re: CL1B power distribution

2009-04-26 Thread David Woodhouse
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 single

Re: CL1B power distribution

2009-04-26 Thread pgf
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

Re: CL1B power distribution

2009-04-26 Thread James Cameron
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

Re: CL1B power distribution

2009-04-25 Thread John Watlington
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 from any

Re: CL1B power distribution

2009-04-25 Thread Richard A. Smith
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 activities like

Re: CL1B power distribution

2009-04-25 Thread pgf
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 will be available

Re: CL1B power distribution

2009-04-25 Thread Benjamin M. Schwartz
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 available via EC

Re: CL1B power distribution

2009-04-25 Thread Nate Ridderman
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 w...@laptop.org wrote: BTW, Gen 1.5 is the OLPC codename for the

Re: CL1B power distribution

2009-04-25 Thread Nate Ridderman
On Sat, Apr 25, 2009 at 10:05 AM, p...@laptop.org 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

Re: CL1B power distribution

2009-04-25 Thread Richard A. Smith
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

Re: CL1B power distribution

2009-04-25 Thread Richard A. Smith
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 this to

Re: CL1B power distribution

2009-04-25 Thread pgf
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

Re: CL1B power distribution

2009-04-25 Thread James Cameron
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

Re: CL1B power distribution

2009-04-25 Thread John Watlington
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: - if there are

Re: CL1B power distribution

2009-04-25 Thread John Watlington
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, or

Re: CL1B power distribution

2009-04-25 Thread Benjamin M. Schwartz
-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 is

Re: CL1B power distribution

2009-04-25 Thread John Watlington
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 the laptop

Re: CL1B power distribution

2009-04-24 Thread John Watlington
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 ___ Devel mailing list

Re: CL1B power distribution

2009-04-24 Thread Albert Cahalan
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 control