Have a Neato XV-11 robotic vacuum cleaner with an intriguing USB port?
Check out Hash’s post at the Random Workshop about connecting to the XV-11’s built-in serial subsystem via USB to send and receive commands and data from the vacuum. I’m using a Linux box and minicom. 🙂
Now I just need a miniature embedded Linux platform with wifi so I can wirelessly communicate with the robot while it vacuums so I can try to create images from the LIDAR data as it maps the house…
I upgraded Fedora 12 to Fedora 14 over the weekend using PreUpgrade for the first time. (I tried a direct yum distro-sync upgrade first but it got stuck in infinite dependency loops.)
Overall I was impressed with the download size reduction and the install speed after rebooting the system for the anaconda installer to apply the new packages. I liked the reduction in system downtime resulting from downloading all the packages before the reboot and the smaller set of packages that were installed.
Some extra steps I had to deal with:
- There are a couple bugs in the version of PreUpgrade that is part of Fedora 12. This post on The Wily Blog contains the fixes to the preupgrade-cli script needed for it to run.
- preupgrade-cli needed /etc/sysconfig/i18n to exist but it was missing on my system. I created the file with the default values from the Fedora docs to get past this issue.
It also seemed like the install asked a few redundant questions it could have figured out before the reboot to start the install:
- The installer asked whether to do a fresh install or an upgrade, where a PreUpgrade is obviously an upgrade.
- The installer asked which filesystem’s installation to upgrade (there was only one on the system), and then again asked which filesystem to add to the “upgrade” list. I believe it could have assumed the same filesystem for both questions, and even possibly set default values for all of them based on the filesystems in use when PreUpgrade was run before the reboot.
- The installer asked which interface provided the internet connection for downloading additional packages and images, which PreUpgrade could have figured out before the reboot and passed it along.
This upgrade was the most painless Fedora or Red Hat upgrade I’ve done in years! Almost all of my services worked afterward with no reconfiguration. A big thanks and hats off the the Fedora team for PreUpgrade!
At the Chevy Volt test drive, waiting in line…
Inhabit posted a story about a net-zero energy small house (1,051 sq ft) built recently in Fort Worth:
Zero Energy Casita in Texas Opens to the Public | Inhabitat – Green Design Will Save the World.
Lisa and I recently went on the Austin Cool House Tour co-sponsored by the Texas Solar Energy Society and Austin Energy Green Building.
We realized the efficiency retrofits to our home were pretty similar to what we saw on the tour, so for fun I thought I’d write up the green feature list of our house in the same format as used by the tour book.
Spangler Home – Northwest Austin
Built as a traditional non-green building, this Austin home has been retrofitted for energy efficiency and simple but high-tech living.
Owners: Lisa and Jason Spangler
Solar PV: Texas Solar Power Company
- 10KW grid-tied solar photovoltaic array (by Texas Solar Power Company)
- Whole-home energy monitor (TED 5000).
- White reflective metal roof (Sheffield Metals CoolR Solar White Galvalume – Reflectivity 0.68, Emissivity 0.85, SRI 82, 25% recycled content, 100% recyclable – installed by Southwest Metal Roofing Systems).
- Level 2 EVSE (electric vehicle car charger) and a Chevy Volt range-extended electric car
- Lawn replaced with native plant and prairie garden which requires almost no supplemental watering. Crushed granite and limestone paths allow water penetration. Mature trees provide shade.
- R-38 insulation in attic with R-8 ductwork. R-9 garage door insulation.
- 1 gpm low-flow showerheads (from New Braunfels-based Bricor). Shut-off values on showers for optional Navy shower.
- Solar screens on all windows.
- Energy Star appliances from the highest CEE efficiency tier (dishwasher, refrigerator, clothes washer and dryer). Energy Star electronics.
- 19 SEER multi-zoned HVAC system with variable speed motor and fan coils, and programmable thermostats.
- All lighting is CFL or LED. (LED fishtank and main kitchen lighting reduces energy usage of most-used lights.)
- High efficiency aerodynamic ceiling fans with timed remotes throughout. (Gossamer Wind fans)
- Masonry and fiber cement siding and trim (Hardiboard).
- Ethernet networking (Cat6) and high speed Internet connection enables telecommuting to save energy and reduce emissions. Energy-efficient computers. Notebook and Home theater systems that sleep when not in use.
- Weather station (Davis Vantage Pro2 Plus)
- Easy access to transportation – bike lanes, public transportation (bus stop 0.4 miles away), two light rail stations nearby (4.0 and 5.2 miles).
Any other ideas for increasing energy efficiency or going more green? Leave the in the comments!
Update: Here is an aerial photo of the metal roof and solar panels from Google Maps:
Did DNS partially break under Fedora 12 32-bit or x64 on your machine recently?
It was the strangest thing… DNS problems started for me last week, even though I had not done any software updates since the beginning of April. Machines using my caching nameserver would be fine, but some programs running locally would fail all name resolves (while others would succeed).
After much pulling of hair, gnashing of teeth, and searching of Google, I eventually ran across a bug entry and comment that helped with the following instructions:
- yum install nss-mdns
- Change the hosts line in /etc/nsswitch.conf to “hosts: files mdns4_minimal dns”
And name resolution is back! 🙂
Buggy software played a part in radiation overdoses given to some cancer patients, leading to deaths.
The Radiation Boom – Radiation Offers New Cures, and Ways to Do Harm – Series – NYTimes.com.
I’ll be speaking at two game development conferences during September: CEDEC 2009 in Japan and GDC Austin in Texas. Details and links follow.
CEDEC 2009 – CESA Developers Conference 9/1 – 9/3 in Yokohama, Japan
- Handling Code and Assets for Huge Projects Using State-of-the-Art SCM
- What I Have Learnt From Japan (panel) – Tuesday 9/1, 11:20 – 12:20
GDC Austin (Game Developers Conference) – 9/15 – 9/18 in Austin, TX
- Defending the Realm: Resisting Exploits and Hacks to MMOs and Other Online Games (roundtable)- Thursday 9/17 3p-4p
Look me up and say hi if you are there!
It looks like my Samsung HL-T6189S LED DLP TV runs embedded Linux! Cool.
I was looking through the firmware downloaded from Samsung’s web site for the set (to make sure 1019 was the latest firmware for the HL-T6189S) and found the following files inside of the archive:
- run.sh : a shell script
- rc.local : a script ran during startup of many versions of Linux and Unix
- Many .so and .ko files which are shared object files (similar to DLLs) and kernel modules (similar to device drivers)
- Several .img files that appear to be compressed ROMFS file system images (compressed file system images)
Fascinating! Too bad Samsung has announced they are not developing any new DLP sets. I wonder if their LCD displays also use Linux?
Last week I spoke at CEDEC 2008 in Tokyo, Japan about "Recent Trends in U.S. Game Development Processes". And then I followed it up with lots of sight-seeing!
CEDEC is the CESA Developers Conference, the Japanese equivalent to the GDC’s Game Developer Conference in the United States.
My presentation covered Agile development and Scrum, SCM tools including Perforce, and the emerging role of a build manager or build engineer on projects. It was great meeting so many Japanese developers and discussing game development processes, comparing the differences between US and Japanese development.
To view the slideshow of my presentation, click "more…" below and use the presentation controls.