Re: [Fwd: Re: Ambient light sensing via LED response]
Hi guys, How can I help with this, I still teach electrical engineering at the University of Nebraska, and before that I have about 25 years in the field. Mostly embedded microcontrollers and stuff. I do have several XOs to work with. I would have jumped in earlier but the end of the semester is a bit hectic. Mark On May 10, 2009 Sunday, at 4:13:47:0, C. Scott Ananian wrote: On Sun, May 10, 2009 at 5:01 PM, Reinder de Haan r...@mveas.com wrote: C. Scott Ananian wrote: On Wed, May 6, 2009 at 6:14 PM, Reinder de Haan r...@mveas.com wrote: Absolutely not. The A/D is eight bits, with an input range spanning 0 - 3.3V, so the best you can hope for is about 13 mV per LSB. I would guess actual accuracy to be closer to 26 mV. I think the actual A/D reference voltage is probably *maximum* 3.3V. What's the *minimum* A/D reference voltage? And can the A/D measure all the way down to ground? (Sometimes there's a Vmin for the A/D input, often around a diode drop above ground.) i did some more experiments and at ~20 cm from the halogen lamp i doest matter is i turn the backlight full on of off .. i dont have color anymore at that distance the bare led gave about 250mv (maybe a bit more into a very high R fet gate...) that 250mv is without the light guide and lcd cover installed! with the light guide in place its more like ~70mv ... 0.07/3.3*256= 5.4 LSB and then the Rin of the ADC must be 10Mohm... 5 LSB is still okay, and it could be more if the A/D Vref can be dropped below 3.3V. --scott -- ( http://cscott.net/ ) ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: plz test Build 802 + Firmware Q2E41 = Candidate Release 8.2.1
Updated two systems, both went flawless, then updated software from open wifi, sorry no WPA. Again both worked great. Rebooted my personal system back to teapots Ubuntu, and the new firmware didn't affect it either. So far, all looks good. Mark ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO Gen 1.5
This sounds great, the description makes it sound as if the plastic will be the same. Does this imply that a new mother board will fit into the existing plastic? Mark On Apr 17, 2009 Friday, at 2:24:21:0, John Watlington wrote: OLPC is excited to announce that a refresh of the XO-1 laptop is in progress. In our continued effort to maintain a low price point, OLPC is refreshing the hardware to take advantage of the latest component technologies. This refresh (Gen 1.5) is separate from the Gen 2.0 project, and will continue using the same industrial design and batteries as Gen 1. The design goal is to provide an overall update of the system within the same ID and external appearance. In order to maximize compatibility with existing software, this refresh will continue with an x86 processor, using a chipset from VIA. The memory will be increased to 1 GB of DDR2 SDRAM, and the built-in storage will be 4 GB of NAND Flash with an option for 8 GB (installed at manufacture). The processor will be a VIA C7-M [1], with plans on using one whose clock ranges from 400 MHz (1.5 W) to 1GHz (5 W). The clock may be throttled back automatically if necessary to meet thermal constraints. The enabling chipset is hot off the fab line, the VX855 [2]. This single chip provides the memory interface, a 3D graphics engine, an HD video decoder, USB, SDIO, and other system interface and management functions, in a low power and small footprint package. One change induced by the chipset change is a move from AC'97 to HD Audio. This brings higher sampling rates and allows an upgrade to a stereo external microphone (and DC sensor) input. The CaFE chip is being retired, and replaced with an external Flash management controller, possibly one of the low cost SSD controllers currently being tested. The camera will now be tied directly to the VX855's video capture port. The network interface will be upgraded to an 88W8686, which will halve its power dissipation and move it to an SDIO interface (further dropping the power consumption). The current goal is to locate it in a removable module, allowing its replacement for repair. It will remain powered while the laptop suspends, waking the laptop if a packet addressed to it arrives. It is likely that early production models will not directly support 802.11s (i.e. forwarding mesh packets while the interface is asleep), but we are working with Marvell on several different 802.11s solutions. Gen 1.5 will continue with the existing display, although OLPC is working with PixelQi to try to improve the brightness and efficiency of the screen. The DCON is retained (even though the VX855 includes much of its functionality) as it provides the low power interface and the timing controller functions for the existing display. Overall, the target is to match the Gen 1 XO-1 in power consumption while making aggressive suspend easier, and in price (while changing to components which are more likely to decrease in price). It is likely that both goals can be met. We also expect the Gen 1.5 machines to ship with an OLPC 8.2.x software release, modified to support Gen 1.5's new hardware but otherwise unchanged from the current production software release and compatible with our current software in the field. Gen 1.5 machines will be deployed in environments already populated by Gen 1 machines, so seamless software interoperability is an important goal. Early versions of the hardware (bare board) should be available for driver development at the end of May. A larger number of prototype laptops (several hundred) for software development and testing will become available around the end of August. The OLPC contributors program will be the preferred way of requesting a Gen 1.5 machine for testing your software for compatibility or development. We hope to use the contributors program to ensure Gen 1.5 support for the wide variety of application and OS solutions created for Gen 1.0. We're excited to be finally able to make this news public. While members of the technical team have been working on this for several months, it was not until last week that we could with any certainty say that we were going to refresh the hardware and what that refresh was likely to be. We're now committed to this project and look forward to working with you to make it happen. ---John, Ed, and the OLPC Tech team. [1] http://www.via.com.tw/en/products/processors/c7-m_ulv/ [2] http://www.via.com.tw/en/products/chipsets/v-series/vx855 ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Fedora 10 on XO
I second the motion of putting the xfce as an option in the control panel. As these kids with the machine get older, it gives them an option to continue learning and using a machine that will come closer to matching those in business. I have been playing with the gentoo xo spin, and it boots from off to gnome in 90 seconds. This is from the SD card. Running gentoo is harder for me because most of my machines are Fedora based. Mark On Dec 4, 2008 Thursday, at 6:44:20:0, Chris Ball wrote: Hi, I meant that we would ship a Sugar interface and a standard Fedora X-Window interface (e.g. XFCE) on the same NAND. I should have said desktop environments as Martin notes. Okay, I see, that sounds good. If we're comfortable with Xfce, it sounds like we should resurrect Scott's work from about six months ago on Xfce-and-Sugar in the faster builds. Thanks, - Chris. -- Chris Ball [EMAIL PROTECTED] ___ Fedora-olpc-list mailing list [EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/fedora-olpc-list ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
amazon sales, when do we get to know how many units were sold.
I was just wondering when we can get an update on total units sold on the 08 G1G1 program. Thanks Mark ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Record app in joyride 1927 has problems
I thought I had messed something up, so I did a full reflash of the memory. I ran into some minor issues with the reflash, but got it done. The record app still does not respond as I expected. It powers up, but it used to show live video from the default display. Now it just snaps a picture as it is powering up and shows me that. If I click on the Video tab, it snaps another one, but still does not show live vid. If I click back on the Photo tab, it takes another picture but still no view mode. Looking in the .sugar/default/logs/org.laptop.RecordActivity-1.log I find unable to create ~/.gnome2 directory: Permission denied .gnome does not exist No gtk.AccelGroup in the top level window. Mark ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Record activity broken in joyride-1842
I updated my g1g1 with the usual olpc-update -r -f joyride-1842 The update went ok, but when I attempted to play with the record activity, the camera doesn't give the normal video feedback, the image is frozen and can not take a picture. Switching from Video to Photo will cause the image on the display to update once then freeze again. If I alt tab to the Journal activity and alt tab back, it again takes one picture and freezes. Full power cycle does not fix it. Record and Journal are the only two activities running. Mark ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: 1789 - sugar does not boot (1788 and 1790 either)
I also have had issues with builds 1788 and 1790. These would also not boot. I resorted back to 1784 to get it to boot. With 1788 it looked like it was locked up, but the power button still puts it in suspend and brings it out again. Ctl alt F1 to get to another screen did nothing until pressing suspend again a few times. It is like the keyboard isn't generating interrupts, The keystrokes are remembered and processed eventually by pressing power button several times. Waited until today and upgraded to 1790 and it didn't boot either. Anything else I can test to help??? Thanks, Mark On Mar 22, 2008, at 12:03 PM, Dennis Gilmore wrote: On Saturday 22 March 2008 11:52:47 am Michael Stone wrote: Mikus, Thanks for the experience report. Have you tried holding the '✓' (check) gamepad key in order to disable pretty-boot? Joyride is definitely not supposed to be broken, but it's hard to tell what to revert without better knowledge of what's actually failing. Examining http://dev.laptop.org/~rwh/announcer/joyride-pkgs.html I suspect kbd-1.12-22 - 1.12-23 since we know that 1.12-23 (accidentally) contains an html file describing a spanish keyboard map instead of the map itself. does 1788 work for you? im wondering if libnl 1.1-1.fc7 is to blame. i had systems boot fine with kbd-1.12-23 installed they just used an english not spanish keymap on the console -- Dennis Gilmore ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
joyride builds broken again
Last 11 builds can't be downloaded, is the server full again? http://dev.laptop.org/~bert/joyride-pkgs.html Is this the right place for me to post this? ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Jabber server issues
Ok now I am confused .. I am setting up a jabber server, it is not up yet, but its close. Both XO machines in front of me have been set to this machine. I can verify that by: sugar-control-panel -g jabber And they return the expected results. My wireless connects to the local wireless network as it should. I almost always see one other machine in addition to the expected machine. But always only one other. Sometimes it is Dan Schmit, another time its Colleene Colaner, now its Will Roger. I shouldn't see any of these, unless they have machines within range. I do not know these people, but I did a search at the university that I am at and found a Dan Schmit and Colleene. I talked with Dan it isn't him but he wants one. Haven't talked with Colleene yet and Will doesn't show up on a search. If I disconnect from the wireless access point, they vanish, so they are comming in on the non mesh connection, but why Any Ideas ? Both machines are joyride-1722 Mark Bauer ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Joyride builds are incomplete
I would like to try the latest builds, but all builds (6 of them) after joyride-1643 are incomplete? dev.laptop.org/~bert/joyride-pkgs.html and the rsync rsync://updates.laptop.org both show only up to 1643 as good? Is there a better place to look? Thanks Mark ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Battery charging and display intensity in joyride-1594
G1G1 program (thanks guys) upgraded to joyride-1594 firmware Q2D10 Plugged in after about 2 hours of use just sitting there on the sugar screen that shows what apps are running. Battery shows not charging (it did when I first plugged it in). Putting mouse over battery symbol, and it is says battery fully charged. But the charge light is still amber, It used to go back to green (or yellow). Second issue.. Not touching the system, the display intensity keeps jumping up and down. I am still on AC, no need to dim the display, it is just a bit annoying. Thanks for the good work. Mark ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
