1528 posts • joined 8 Oct 2009
If the diode + capacitor solution turns out to be insufficient, I'd get a step-up converter to boost the battery voltage to 12..18V, then an large-ish cap (4700uF, 25V), then a step-down converter to feed the Pixhawk at its required voltage.
Supercaps are not really capable of delivering large currents; they're meant as a buffer for stuff that draws little current (like RTCs and CMOS storage) for which you might not want to use a primary button cell (because of replacement issues) or rechargeable cells (additional charge circuitry, degradation).
Depending on the current drawn by the Pixhawk, slapping a reasonably large cap on its logic power supply line together with a series diode, so that when the servos cause the battery voltage to drop it won't propagate to the Pixhawk, would be my try to fix this.
Re: anyone who puts other motorists at risk by slowing
which resulted in the death of two following motorcyclists
That's not solely her fault (and I am a motorcyclist). Following too close so that you don't have time to react to a vehicle suddenly stopping, then brake or swerve to avoid collision is noone else's fault but the person who's following too close. Sure, on a motorway it's usually a steady flow of traffic in more or less the same direction, but anything can happen to disrupt that, and it behooves anyone (not just motorcyclists, BTW) to be aware of that.
What, in any case, is the number of ducks you can safely mow down without stopping, and at what speed? Had one taken flight and hit the windscreen, chances are she would have slammed the brakes, with quite likely the same (or worse) outcome. What if it had been a goose or swan instead of a duck? The average driver would brake, doesn't matter if that's before or after hitting it. A deer? Moose? What if she'd had an engine failure? Or a truck slightly ahead suddenly blowing tyre shrapnel in the direction of her car? Just a number of reasons why not keeping distance can be rather unhealthy.
Re: 20 foot high tower of feathers
Years ago on holiday, on a remote country road, my Dad's car hit a chicken just as we passed a small cottage
Mate of mine hit a chicken with his sidecar rig. Presenting it to the farmer's wife, uttering apologies, she replied laconically "Oh, that's chicken soup tonight then."
I once hit a pigeon with 2 Class 37 locos
I take it you hit it with the first one, with the other and the rest of the train just supplying the necessary momentum to offset the pigeon's impact.
Re: the day after....
And this hacker group managed to conceive the attack and launch it in that timeframe
Probably a matter of the payload being there already (probably in several variants), crafting a plausible-looking carrier pdf (a press release in this case), identifying who to send it to, selecting some compromised mail server and a receiving system (both available in abundance), then adding it all together, stir-frying it briefly and serving it up. Shouldn't take more than a couple of hours for a small group with the right level of organisation.
The one thing that's rather baffling, as has been mentioned already, is what they hoped to find after just one day.
Re: "An IP address in china"
I'd like to see the Received headers
That will tell you which mailservers it touched, and where it was injected. And then only if none of those machines was compromised. It won't tell you who injected it.
Re: No googling?
the good thing about RedHat certification is that you have to sit an all-day practical test to prove you can actually do stuff.
The bad thing is that they won't even tell you what you did wrong, even just globally, like "Questions i, j, k - OK, questions m, n - NOK, questions o, p - partially OK". I failed an RHCSA by an utterly surprising 50 points, given that I had all questions but one (and another one partially) answered and working correctly, unless I'd misinterpreted those questions and the required end situation.
That total lack of feedback didn't exactly spur me on to retake that exam.
Re: I feel like I'm living in an alternative reality sometimes.
so far East you can clearly receive Belorussian radio.
You mean those broadcasts that you can listen to anywhere in the world, using only the fillings in your teeth?
Re: If you want a proper coffee
Raw beans smell like lentils.
I wonder if how they'd be in a soup.
There's this image in my head now where Neil is tasting his "lentil" dish where Vyvyan has replaced them with raw coffee beans.
Re: meanwhile in the real world
Crappy chicory mix which tastes like dry cleaning fluid? Luxury! It could be Mellow Birds...
And you have to lick it off the road from between the poisoned gravel and then work 26 hours a day?
Re: It's that featureless mouse thing again!
For the further edification of Luddites, Apple have instructional videos built into the mouse's Preference settings that show you how to use every gesture.
Which you need the mouse for to navigate to.
I see a bit of a problem right there.
Re: so just like...
>why the fuck would anyone design a drive train so that it was even possible to mis-install a single part--let alone the flywheel counter-weight--incorrectly at all?
In several cases Honda appears to have made some last-minute design changes only after Friday Afternoon Sake Hour. Resulting in parts, from two similar motorcycle models, that look identical but aren't for no discernible reason.
That said, I once mounted the flywheel on my BMW boxer 1/5 rotation off. To its credit, it even ran acceptably with the ignition advance cranked all the way to compensate for this (which resulted in about 20 degrees late ignition). But those engines, I've witnessed, also run OK on diesel.
Re: Linux maybe, but OSX.. You'd need to be off your tree.
Also, you can perform an in-place upgrade of a distro without rebooting - your new kernel will get picked up on the next reboot
Sure, your in-memory kernel won't care that the bootloader will use a different one the next reboot, and won't care either if that reboot never happens; but to use the new one you have to get that one into memory and running. So then why install a new kernel if you're not planning to reboot shortly afterward?
And I'm not going to do fresh installs for minor kernel upgrades, but I do want to apply them for security raisins.
Re: Linux maybe, but OSX.. You'd need to be off your tree.
If you're using Ksplice, there's no reboot for kernel patches.
An Oracle product now. Thanks, but no thanks.
Re: But this has four!!
Mine is a pretty damn expensive (for such an item) four-options pen (black, red, pencil and PDA stylus) because I dislike carrying separate items for each of the functions while on the move. Same reason I carry a Leatherman, not a toolkit with the set of tools that the Leatherman covers. And in both cases I the tools I carry do a fair job of filling my requirements, taking their limitations into account, while on the other had not giving up at the first hurdle.
In my workshop I have all the separate tools I'd need, and at my desk I've got all the writing implements I'd need.
What all this has to do with OSes is unclear. Oh wait. Linux on laptop and home server (and VMS on the real computers), and stripped-down Linuxes on the Pis and BBB.
Re: How many zeros?
If the so called "free software" movement products are so good, how come all those companies out there have not taken it up already?
Re: Linux maybe, but OSX.. You'd need to be off your tree.
[linux] you can upgrade the OS without even having to reboot..
If you get a new kernel, it's reboot time. No ifs and buts.
Re: Deaf to users...
And, like it or not, Linux will not be the beneficiary. If that was the case, the Linux percentage would have hit 95% when Vista appeared and was revealed as the disaster that it was.
At that point there was no incentive to move off 2000/XP and (therefore to Linux to avoid Vista) at all. Only M$ marketing blah.
We've got a couple of authentic PDPs they can lease for the time being.
Re: Oooh an SCP with its own OS ...
Just slightly better: VAXELN on a MicroVAX
Re: Also, newspeak
Redact is the right term here. Look up both words, and compare the definitions.
Applying the censorship label to cases where some people are not allowed to see some parts of a dataset that other people can see in full is devaluing the term.
Re: Try reading the standard...
KNX addressing works on the basis of individual and group addresses
I know. I'm using KNX at home.
If you wanted a physically isolated KNX network in each room, you'd need to add a power supply as well
Nope. You need one humongous power supply (or a couple), and a set of chokes for each physical segment.
. So to guess the address of a different function, you simply need to change the address in the packet
Read the article. He changed the IP address he was communicating with, but maybe this has been mangled in the article.
Re: Try reading the standard...
Gateways (depending on manufacturer) have limited functions to restrict access - however, to avoid this hotel's situation from arising, you'd need one gateway per room, and isolated KNX segments.
What I read from his story is that the hotel indeed has one gateway per room, or a device that emulates one and does some IP address to KNX address mapping. Note that he changes the last octet of the transmitted IP address to control another room. That means he's communicating with another gateway device, which apparently has the same range of KNX addresses behind it..
For a 200-room hotel a single gateway would be sufficient, even at 8 KNX addresses for sensors and actors per room If they want a bit more flexibility, and a setup usable across hotels of several sizes with up to several hundred rooms per floor, one gateway per floor would still be fine. In which cases the control app on the iPad takes its range of KNX devices to be controlled from the IP address associated with the room. Without further security lockdown both cases would still be open to the kind of hacking as was demonstrated here, though, but now requiring modifying the target KNX address instead of the IP address.
In the case at hand, the hotel would need to start using VLANs so that the room's KNX gateway can only be seen from that particular room's access point, or the dedicated iPad.
Re: "It seems terrorists aren't going to be crashing planes with a computer any time soon."
Which tend to be controlled by computers, FWIW.
Re: No spare wheel?
What happens when you get a puncture then?
<mode="Captain Obvious">You get a flat. </mode>
When was the last time you had a puncture? Mine was eight years ago. On a motorcycle. The one before that was also on a motorcycle. And the one before that too. Note that motorcycles aren't known for their spare-tyre-carrying-capability. So that's carrying a can of gunk (which are usually shit) and a tyre pump, or a phone to call roadside assistance with. Who tend to start with a can of gunk too, only a somewhat better grade of gunk, but they also have a compressor to top up the tyre after the gunk has done its job. These options are equally available to the spare-wheel-less car driver.
Re: We are all going to love...
If you're referring to Audi, that'd be four rings. Or would every E-Golf be tailgated by the International Olympic Committee?
Re: VMS Software Inc.
I don't know if folks remember me
Sure, though we never met in person.
I'm thinking that's what the "serial porting" reference meant. ICBW.
Re: The whole 9 yards
All that would surely have changed for the Alpha ports, though?
From what I got to hear, for the VAX to Alpha port a lot of work was in getting rid of VAX-specific features (which must have been everywhere; after all, they were developed as close as can be), and aiming for architecture independence, but the Itanium port wasn't quite that straightforward after all because of the way it dealt with smaller-than-64-bit data structures. But dealing with that is primarily a task of the compiler and linker as long as you're not writing in assembler or doing an OpenSSL with in-memory data.
Re: The whole 9 yards
I got mine signed by Ruth Goldenberg!
$ SET ENVY /COLOR=GREEN
MacOS went from 68k to Power, and OSX went from Power to X86, but the only thing OSX and MacOS share is that they're written by Apple (plus maybe a few minor bits, and OSX borrowing heavily from FreeBSD), so close, but no cigar there.
That would be NT only, and while it was ported from x86 to PPC and Alpha, those were parallel ports, not serial, like VMS (VAX->Alpha->IA64).
Again, originated on x86, ported to several architectures, but they're all one port away from the original.
Re: Legacy only
VMS is a solid system but the trouble is it is too different from the mainstream now, so it is a lot of extra work if you want code that runs on it and also on Windows and *nix.
Why would one want that? VMS may be niche now, but if your requirements fit that niche, it's better to fully use its features instead of aiming for some compatibility with *nix, let alone Windows.
And there's one area where VMS is still miles ahead of any other OS: clustering. It's been part of the OS for three decades, not some relatively recent development that's been bolted on, as Linux has (in various flavours, neither of which fully covers the VMS cluster feature set)
Re: Jealousy reigns
Alpha was killed by Compaq, instigated, they say, by HP, who wanted Compaq, would get VMS with it, and wanted to unify on the Industry Standard (harhar) Itanic.
Re: Can someone please explain
teaching security from the outset to developers, and then companies that employ them insisting that the concept is baked in to EVERYTHING they write
The biggest problem is that developers rarely face the consequences of shoddy programming; not even getting called at oh-dark thirty when the application they've cobbled together shits itself and falls over.
I've got several solutions to this problem, the severity of which can be selected according to whether it's some application that just should do something mundane in the back of a datacentre, or a large, internet-facing setup that carries sensitive data, but I fear that the UNCHR, Amnesty and the RSPCA will object.
Re: Fritzbox DECT
Like it says on the tin, it's got a DECT base station built in which you can use if you have phone service on your incoming line (and if you don't, you can still use them as your home intercom/PBX). The FritzBox also allows hooking up ISDN phones even if you have POTS service.
If I'm not mistaken it can also do VOIP for the PBX, but I've not used that function yet on mine (FritzBox 7340)
How do they know it's them?
In February 2013, Mandiant identified Comment Crew as People's Liberation Army Unit 61398.
and not the Army for the Liberation of People, or the People's Liberation Front, or the Popular Liberation Army?
That's what I did, last week when I was in London. As the hotel's WiFi had the stability of a drunken elephant on roller skates, and glacial speeds during those brief moments it managed some bytes to pass in AND out, I connected to one of the BT-FON networks that were visible, and, after duly logging in, enjoyed a stable and not at all slow connection so that I could indulge in the despicable activity that is reading El Reg
Re: I have to defend the police here...
How exactly were the police to have established more facts?
By establishing whether the matter reported was something that required taking action on in the first place.
To which the answer is a resounding no.
All of the above
Making content is a costly commercial enterprise, and the content creators have the right to determine and control how they recoup their costs, just like any other manufacturer.
But once the content has been created, artificially limiting sales to particular regions would result in lower revenue.
And midget porn
Re: One Giant Leap... Downward?
that can mean only one thing: emmental
Well, the moon is already made of cheese* **, so there's bound to be holes in it. Which means that for a human population we only need to get crackers up there. And mustard.
* So sayeth Wallace & Gromit
** Leicester? Tilsit? Caerphilly, Bel Paese? Red Windsor? Stilton? Emmental? Gruyère? Norwegian Jarlsberger, Liptauer? Lancashire? White Stilton? Danish Blue? Double Gloucester? Cheshire? Dorset Blue Vinney? Brie, Roquefort, Pont-l'Évêque, Port Salut, Savoyard, Saint-Paulin, Carre-de-L'Est, Bresse-Bleu, Boursin? Camembert, Gouda? Edam? Caithness? Smoked Austrian? Japanese Sage Darby? Wensleydale? Greek Feta? Gorgonzola? Parmesan? Mozzarella? Pippo Crème? Danish Fimboe? Czech sheep's milk? Venezuelan Beaver Cheese?. Cheddar? Ilchester? Limburger?
But he still was integrated into the Galaxy Song, as the not-quite-foot-like Pythonesque Foot to Brian Cox, who was picking nits with the physics involved.
Re: Quick way to check for infection
:~> locate humans.txt
That will just tell you whether you have a file 'humans.txt' on your system, and only if the locate database is up to date. What you actually want to do, and what the poster you replied to did, was looking through Apache logging, whether there was a http request for said file located on google, so checking whether PHP allows requesting a remote file.
Re: No one ever heard of risk analysis?
After all, these events are rare - the best I can find is that this has happened 7 times since 1943 (happy to be corrected).
Depends a bit on what you're counting; en-route incidents at nominal cruising altitude like this one, I get 7 too. Most of the remaining incidents involving civilian airliners had them flying in or out of airports near (or even in) active insurgency zones, where one would be happy not being shot at.
could you perhaps compare how this attacker would stand up against the F35-whatevers that the Queen Liz is currently not equipped with, and which appear to be catching on fire for as yet undetermined reasons? Both their actual intended role, and related stuff like cost, maintenance, etcetera?
Re: Is this really Apple gender discrimination rubbing out
The clit, or is the iPhone engraving software just designed to reject really, really poor verse?
OK, then it should coredump or even catch fire on being fed some Vogon poetry.
Re: I humbly submit the following name...
Currency exchange rates from 2012-10-24
2585 units, 85 prefixes, 66 nonlinear units
You have: 22753291487000 miles
You want: brontosauruses
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