Humor Random Comments Thread

[Urwumpe]

I was relatively fluent at vi for a while when I had to use it, actually. "Relative" as in I could edit text without swearing, but I couldn't do magic.

I also only can use vi for the basic tasks, but the basic tasks are a bit excessive here. A lot of copy and paste sometimes. But vi is the only editor that also works for Solaris.

 

[orb]

I use vi only when Midnight Commander isn't available, which rarely is the case. As for Emacs, I've never felt any need to use it, so I don't know what I'm losing, though every Linux distribution I've been installing at the beginning of 2000's suggested that I will want it in my system. And if I need something more than basic editing tasks, I use sed.

 

[jedidia]

I've never felt any need to use it

There's one single incentive for me, and that is that it seems to be the only editor that can be turned into a visual clojure debugger. I didn't get that particular feature to run yet, however... :shifty:

 

[Artlav]

On a completely random topic, i just read an expression "as subtle as a fart in a spacesuit", and can't quite figure if it should mean "stinking obvious" (the fart have nowhere else to go) or "completely undetectable" (there is no one else in the spacesuit to notice it).

What do you think?

 

[MaverickSawyer]

It may be extremely obvious to you, but no one else will know it.

 

[Notebook]

N,

 

[jedidia]

Apparently, on a raspberry pi, Harddrive powers you... I'm not sure if I stumbled on an undocumented feature here, or if a fire is going to break out any minute... :shifty:

 

[Urwumpe]

Apparently, on a raspberry pi, Harddrive powers you... I'm not sure if I stumbled on an undocumented feature here, or if a fire is going to break out any minute... :shifty:

:blink:

Run away!

 

[Fabri91]

Apparently, on a raspberry pi, Harddrive powers you... I'm not sure if I stumbled on an undocumented feature here, or if a fire is going to break out any minute... :shifty:

Can you describe your setup?

 

[jedidia]

Can you describe your setup?

SATA HD via USB-adaptor into pi, with the other cable into a USB power hub.

Apparently it is indeed kind of an undocumented feature.

 

[Artlav]

Well, if you look at the PI 2 schematic ( https://www.raspberrypi.org/documen.../Raspberry-Pi-Rev-2.1-Model-AB-Schematics.pdf ), you can see that the power rail of the USB port is connected directly to the input 5V rail, so the power would flow from the hub via the HDD to the right spot on the PI.

However, you might also note that this leaves the fuse and fuse-reliant protection circuitry on the wrong side of the power input, that is if something were to overload the fuse won't save the day.

Being buzzed by a mains connected device is normal thanks to the capacitors across PSU transformers letting a slight trickle of AC through. You should feel the same touching a metal case of a PC or a laptop with the moving back of your hand.

 

[jedidia]

Well, if you look at the PI 2 schematic

Electronics schematics are chinese to me. Hell, often enough they're actual chinese, now that I think about it... :lol:

However, you might also note that this leaves the fuse and fuse-reliant protection circuitry on the wrong side of the power input

I see... but when I power it normally, and have HD attached, and the fuse blows, won't the surge just come in through the backdoor anyways?

 

[Notebook]

It might well do. It depends where the short is and where power is coming from.
Putting power-supplies in parallel is never a good idea, IMHO.
I'm not a designer, but I've fixed a lot of stuff, and the USB system never appealed.

N.

 

[Artlav]

I see... but when I power it normally, and have HD attached, and the fuse blows, won't the surge just come in through the backdoor anyways?

That's actually a good point - with the HD attached the fuse won't do much good regardless of the normal supply presence, since there would be another path for current to be supplied from.

Essentially it's a matter of bad (or rather not wide-sighted) design on the HD part - most PCs and laptops have a current limiting circuit on the USB power, which does not allow backfeed through it naturally, and the device designers assume that in their design. PIs and similar cheap boards don't have that.

One solution would be to use the hub as both a hub and power supply, rather than plugging power into one hub and data directly - the input port of a hub shouldn't backfeed if it follows USB specs.
Then again, plenty of hubs don't follow the specs either...

 

[n122vu]

Apparently, on a raspberry pi, Harddrive powers you... I'm not sure if I stumbled on an undocumented feature here, or if a fire is going to break out any minute... :shifty:

Talk about ironic. I literally just stumbled upon this last Friday when looking at options for powering my Pi3-powered Stratux.

It's actually a documented feature of the Raspberry Pi Power Supply, and it's called Backpowering.

So, in summary, you stumbled upon an obscure documented feature, and although it would be an extreme variation of "your Raspberry Pi could potentially be damaged," a fire could in fact potentially break out...

 

[jedidia]

the input port of a hub shouldn't backfeed if it follows USB specs.

The USB-port on my HP ZBook even backfeeds the thing, and that's about the most expensive piece of hardware I have lying around :lol: (well, appart from the beefed up Lenovo thinkstation at the other end of the table, obviously :shifty

EDIT: Oh wait, I realised that I got you backwards there... You meant to plug power and data of the HD into the hub, and then feed the data from the hub to the pi.
Huh, I guess our electronics engineer will have a bit of thinkng on his hand when he gets back. The whole stuff will be powered by the PoE-to-USB converter he developed, so he'll have to determine how save the whole setup is when we plug all that stuff in.

---------- Post added 12-13-16 at 02:49 PM ---------- Previous post was 12-12-16 at 04:54 PM ----------

Servers that return errors well formated and styled as HTML are great... unless you're testing with curl. :dry:

 

[Fabri91]

Northern Italy these days:

I descend in the fog every day in the morning and get back out in the evening never seeing the sun. :lol:

 

[Andy44]

And this from the Horrible Ways to Die Department.

 

[Artlav]

Despite the title, the actual death was not from the chocolate but from being ground into a pulp by the mixer in the vat.
Some cellphone...

I do hope they cleaned the line after that, instead of selling some exotic-flavored candy, like in that case when several people took a "bath" in a tub of milk.

 

[NukeET]

[URL=http://s133.photobucket.com/user/NukeET/media/Orbiter/AussieSpaceProgram_zpsitn8koue.png.html][/URL]