A gutter cleaner

Posted on 2014-08-25 by Charlie

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Time Domain Reflectometry visualized

Posted on 2014-07-22 by Charlie

Wikipedia provides this excellent graphic to help explain how you can determine where the fault is in a very long cable.

Reflection of an electric pulse back towards point of origin

Time delay reflectometry is a clever trick where you can calculate the location of an imperfection in a conductor by timing when the “bounce” returns, as long as you know the speed of signal propagation in the wire (which you generally do).

The impedance of the discontinuity can be determined from the amplitude of the reflected signal. The distance to the reflecting impedance can also be determined from the time that a pulse takes to return. The limitation of this method is the minimum system rise time. The total rise time consists of the combined rise time of the driving pulse and that of the oscilloscope that monitors the reflections.

Plumbers will note that the behaviour of the electric flow here is analogous to water hammer. I think it should be possible to find the distance to an obstruction in a pipe as a TDR calculation, as long as you know how compressible the fluid medium is.

Go Baby Go

Posted on 2014-07-18 by Charlie

GoBabyGo is an ongoing project started in 2006 by pediatric researchers Cole Galloway and Sunil Agrawal. The basic concept, which has evolved significantly since the project’s inception, is to provide mobility to kids who have trouble moving on their own by modifying off-the-shelf toy racecars, empowering them to be part of the action at home, in the daycare center, and on the playground.

“Fun is key here—it unlocks brain development and exploratory drive for the child, and ignites active, engaged play from adults and peers. When your main goal is mobility and socialization of young children and their families, you can’t ask for better collaborators than Barbie and Mater.” –Cole Galloway

The team is also trying to develop kid-friendly exoskeletons to promote upper-body movement and harness systems to provide partial body-weight support and free the hands and feet for sports-type activities.

“There are no commercially available powered wheelchairs for children under three” – Galloway

To learn more about the research, or volunteer to help, contact Cole Galloway through the project page.

bochs is still the box

Posted on 2014-06-24 by Charlie

I’m surprised and pleased to learn that bochs still exists and is still being actively developed and improved. Lots of people said it would die once hardware-accelerated virtualization became commonplace, since pure software emulation of a PC is so much slower than using a hypervisor. But not only is bochs still popular, it’s got competition!

Mechanic invents better baby extractor

Posted on 2014-06-20 by Charlie

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Installing a Square D Electric car charger

Posted on 2014-06-17 by Charlie

Since we’ve got two electric vehicles and a plug-in hybrid, it seemed like time to install a level 2 charging station.

After spending about six months studying the options, we decided on the Square D Model EV230WS which periodically goes on sale at Amazon and the Big Box stores (where shopping is a baffling ordeal!) for about $600.

Honestly, I don’t know if it’s really appropriate to call things “Square D” any more. The company was bought out by (nominally French) multinational megacorp Schneider Electric in 1991, after which they introduced the “homeline” series of circuit breakers and load centers, which are not as well regarded as the industry-leading QO series. But on the other hand, Schneider does still make the QOs, and they are still an excellent product family – I put a big QO breaker box in my house when I upgraded the main service a few years back, and I am very satisfied with it.

The new charger is connected by 8 gauge copper wire with a NEMA 14-50 plug and receptacle, a Square D QO series safety switch, and a 40 amp breaker. The actual current draw of the charging station is 30 amps at 240 VAC, so I am still well within code for the 100 amp subpanel in the barn, and having the 14-50 plug means we can potentially support other 240 mobile loads like Teslas, large RVs, plasma cutters, and portable welders.

Now the plug-in Prius should charge in 1.5 hours instead of 3, and the Leaf is supposed to drop from a totally impractical 16 hours (on the level 1 charger) to much more user-friendly 5 hours.

crank powered beer cooler

Posted on 2014-06-05 by Charlie

Dillweed points out that this could make you the hero of Pennsic.

Of course, at my house you’d just put your beers in the stream. And tell the kids not to mess with them, of course, to avoid any repeats of the watermelon incident.

E-20 restoration on Ebay going cheap

Posted on 2014-04-30 by Charlie

Jeff Antonucci’s got a fully restored General Electric E20 electric garden tractor for sale on eBay. This is the big boy of the Elec-Trak family, only the I5 is arguably mightier, and right now it’s going very cheaply – less than a grand for a machine that uses no gasoline and requires almost no maintenance.

Jeff is a long-time Elec-Trak enthusiast known for his superb restorations. He’s replaced the Apollo-era motor controls with a modern Alltrax fully electronic controller, which is a tried and true upgrade.

Not actually Jeff's E20, but an identical one.

New MariaDB & Linux kernel releases

Posted on 2014-03-31 by Charlie

The Linux 3.14 kernel has yet another process scheduler, a new network packet scheduler intended to combat bufferbloat, kernal address space layout randomization, and the usual plethora of other improvements.

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Classic Electric Garden Tractor for sale

Posted on 2014-03-24 by Charlie

Jeff Antonucci, who is fairly well known and respected in the EV world, has restored a New Idea EGT-150, which is a clone of the GE Elec-Trak E15, and has it up for sale.

Jeff describes his restoration (photo-documented at the Elec-Trak Owner’s Club Forum):

Fully disassembled, sand blasted, powder coated, all new hardware, all new contactors and relays, all motors rebuilt with new bearings and the brushes were replaced where necessary. All new Cole Hersee control switches. Transaxle rebuilt as well. New Carlisle tires. Charger upgraded to include a Landis controller in addition to the timer and a switch to choose between the two. Includes fully restored mower deck.

By incorporating lots of tried-and-true small improvements (like the Landis controller, late model electrics, heavier springs and bearings here and there, etc.) Jeff’s made the machine better than the original, and the original was actually pretty good – although only about 3000 of them were made, there are still some in service after 40 years of continuous use.
Restored EGT-150 electric garden tractor
I would happily buy this machine, if I didn’t already have an original I-5!

Have some π

Posted on 2014-03-21 by Charlie

HiFiBerry, tiny add-on boards bringing high quality sound to the Raspberry Pi

piCorePlayer, a dedicated Squeezebox player (like a Logitech Duet) for Raspberry Pi

RasPiO, a family of add-on I/O boards for the Raspberry Pi

HDMIPi, an affordable 9″ high definition screen for the Raspberry Pi

Homebrew wall-mounted Raspberry Pi powered touchscreen Squeezeplayer

Facebook releases Hack

Posted on 2014-03-20 by Charlie

Facebook has followed up their 2011 release of their PHP Virtual Machine (HHVM, aka HipHop) by releasing Hack, an HHVM-compatible statically typing version of PHP.

I like PHP (mostly because it’s an extremely rapid development language for the web, and also because academic Java snobs hate it so passionately) but static typing should be a fantastic improvement.

Gopherspace revisited

Posted on 2014-03-12 by Charlie

Cal Lee’s discussion of the rise and fall of Gopher, and his refutation of simplistic explanations for the dominance of HTTP, is a good read. But it’s more than a paragraph long and hasn’t any pictures, so it won’t appeal to the average web denizen.

This paper does not provide any one definitive answer to why history played itself out as it did. Instead, I have attempted to refute the very notion that such a unitary answer is either desirable or possible. I have found the concept of mind share to be a useful way of presenting the influences involved without the need to commit to a specific causal chain of events. My hope is that the result can contribute positively to the ongoing historical dialog on why the Internet that so many of us use developed in the way it did.

Museum of Old Techniques

Posted on 2014-03-08 by Charlie

The fine folks at Belgium’s Museum of Old Techniques in Grimsbergen have got some nice photo series online.

Here’s some bronze casting, a shoeing shed for gigantic draft horses, and a charming series of tiny bakehouses. Put your mouse over the picture if you want the slide show to stop so you can study one, move your mouse off to the side to resume.

This excellent one shows how an iron tyre is shrunk onto a wooden wheel. The same technique was used on ancient and medieval shield rims, Celtic chariots, and the quintessentially American Conestoga wagon.

They’re preserving some old mills, too – including at least one with an undershot wheel and a horse mill of uncertain function.

Chrooted SFTP-only accounts with OpenSSH

Posted on 2014-03-05 by Charlie

Courtesy of slashdot user CarlHaagen:

First off, add a group that you call for example “sftponly”. New users that are to be allowed only sftp access should have “sftponly” as their login group, and have /sbin/nologin as shell to deny them shell access. Their home directories should be owned by root:sftponly, and within the home dir you then create relevant user-controllable directories which should be owned by :sftponly.

Secondly, the sshd_config magic that makes the whole charade work:

Subsystem sftp /usr/libexec/sftp-server
Match Group sftponly
ForceCommand internal-sftp
ChrootDirectory %h

What happens is that when the SSHd matches the user’s login group successfully, it forcefully switches over to the internal sftp component instead of the default external subsystem, which in turn makes it possible to chroot the user to his/her home dir without having to place a plethora of system files in each user’s home directory.

Upcoming MO guns study…

Posted on 2014-02-17 by Charlie

The beeb’s article Missouri gun murders ‘rose after law repeal’ says that an upcoming (but currently unavailable) study from the Johns Hopkins Center for Gun Policy and Research “provides some of the most compelling evidence yet for tighter gun controls in the US.”

Apparently it does so by linking the removal of a legal requirement for background checks prior to handgun purchase with a rise in gun homicides. That correlation seems pretty likely, I think; if you intend to kill someone, and you can easily get a gun, why would you use anything else? It’s so obvious as to be almost a tautology.

But I will be interested in seeing how this plays out, since the FBI says that homicides overall went down in Missouri during the same period the study claims that gun homicides went up. This has been the national trend; homicides mostly decreasing as gun ownership has trended steadily upwards.

It seems to me that anti-gun crusaders don’t really argue any more honestly than the NRA’s anti-Obama basket cases.

Don’t use this over a tile floor.

Posted on 2014-02-13 by Charlie

Beautiful but fragile drop spindles.

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Maps of Vanished Empires

Posted on 2014-02-12 by Charlie

Every imperial project, no matter how great, eventually meets its downfall. In fact, you may be reading this in a country that was once part of a now-vanished international superpower. Here are maps that reveal the rise and fall of the world’s most ambitious empires. Thanks, IO9!

Regex Crossword Puzzles

Posted on 2014-01-29 by Charlie

Apparently regular expression crossword puzzles are a thing.

This one looks fun.

National Pipeline Mapping System

Posted on 2014-01-10 by Charlie

Heather found this fascinating web app. It’s crippled, of course, in accordance with the self-destructive paranoia of our times (NEWS FLASH: TERRORISTS CAN EASILY FIND GAS LINES ANYWAY) but it’s still pretty neat.

“The NPMS Public Map Viewer enables the user to view National Pipeline Mapping System data one county at a time. NPMS data consists of gas transmission pipelines and hazardous liquid trunklines. (It does not contain gathering or distribution pipelines, such as lines which deliver gas to a customer’s home.)”

“Please note that the Public Viewer limits the scale of pipeline maps, in accordance with PHMSA’s security policy. When you are zoomed in closer than a 1:24,000 scale (approximately 0.2 miles on the scale bar), you will notice that the pipelines have disappeared from the map. In order to see the pipelines, you must either zoom out or set the scale to 1:24,000 or a greater number. Data cannot be downloaded from the Public Viewer.”

Electric riding mower at CES!

Posted on 2014-01-07 by Charlie

The Cub Cadet RTZ-S Zero isn’t quite as good as a 1973 Elec-Trak… because it’s not a garden tractor capable of mowing, it’s a dedicated riding lawnmower. CES coverage at wired.com.

Despite the battery life being somewhat disappointing compared to Apollo-era Elec-Traks, it looks like a very nice machine – and only about $1100 more than a comparable gasser, so it’d pay for itself pretty quickly if you actually need a riding mower. And there’s an upside to the shorter run time and dedication to a single job – you have to figure it’s probably significantly lighter than the larger Elec-traks with their quarter-ton of lead-acid batteries – you can’t really hop off a stuck E20 or I5 and just push it out of a ditch like a gasoline rider, you have to go fetch a heavy tow chain.

Typing Animal

this is the blog part

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