The 'Raspberry Pi' thread

[IzzehO]

Originally Posted by schnappy

Xbian is a lot more reliable so far, building database is faster, but it's still damn glitchy when playing back 720p.

Hmm I might give it a go. It just sounded to me to be a bleeding edge of raspbmc.

Speaking of which... of all these Debian/XBMC/Ubuntu mergers (and there has been like 5)... how the hell has no one come up with XBuntuMC. Seriously, say it aloud... it sounds excellent.

[Goth]

Each of the two USB host ports on the RPi has a 140 mA PPTC in series with its 5V rail (F1 and F2), which I think is the main problem. You can only draw a maximum of 140 mA out each port.

F3, which is the one in series with the microUSB input socket, is 750 mA.

Personally I think I'll replace F1 and F2 with 500 mA PPTCs on mine and replace F3 with a 1.1A (it's actually listed as 1.1A on the schematic but loaded with a 750 mA part on my RPi board).

There's no real need to use a powered USB hub to use USB peripherals which are within the 500 mA USB spec in my opinion, that's just an added layer of complexity and cost and cable mess. The PPTCs should be rated higher, there's no reason why they can't be, as long as the user understands that it's their own responsibility to provide a 5V power supply with appropriate current capacity to run the RPi plus peripheral devices.

The RPi's onboard linear regulators provide its 3.3V and 1.8V rails, you provide the 5V rail externally and there is no 5V regulator on board.

Originally Posted by IzzehO

500 mA is the minimum standard for USB2.0. Generally a desktop PC will be able to provide up to 800-900 mA. USB3.0 specification has standards up to 1A on the 5V rail.

Regardless of which, that isn't going to be the issue. The RPi itself is using a linear regulator limited to 500mA. So you'll never be able to put greater than 500 mA to the RPis USB ports. The only way around this is to use an external USB hub or to do some soldering and directly connect up things that ... probably shouldn't... be directly connected.



I don't know where you are googling... but that sounds like utter nonsense to me. The ARM SoC on that board isn't going to draw very much more current under load than at idle.

I believe you're mistaking power requirements for overclocker. What you will probably find will improve the situation is to try an overclock.

That aside, it sounds like your issues are far more serious than performance. I would try and reflash the SD card as it sounds, to me, like you have a corrupt image.



I'm not quite sure about this either. The RTL8187 from my limited reading shouldn't draw too much current and should be inside spec. You most likely haven't installed all the drivers etc you need for it.

[IzzehO]

Originally Posted by Goth

Each of the two USB host ports on the RPi has a 140 mA PPTC in series with its 5V rail (F1 and F2), which I think is the main problem. You can only draw a maximum of 140 mA out each port.

F3, which is the one in series with the microUSB input socket, is 750 mA.

.

I knew they had the fuses, I didn't realise they were only 140 mA. It makes sense I suppose. When you're only working with 750 mA (well, realistically the fuse won't drop the voltage low enough until around 800-900), and between the ethernet controller and the SoC you can pull up to 300-400, you want to make sure the USB doesn't bring the whole system down. Unfortunately polyfuses suck. And always have.

Personally I think I'll replace F1 and F2 with 500 mA PPTCs on mine and replace F3 with a 1.1A (it's actually listed as 1.1A on the schematic but loaded with a 750 mA part on my RPi board).

Frankly if I was going to go to the effort of doing that I'd just short the fuses (or maybe put a parallel resistor on top). Highly poor practice and unsafe... but I like to live on the edge when it comes to throwaway $40 gadgets . I'd also replace the LDO for a switch mode to gain some more of that input current back.

There's no real need to use a powered USB hub to use USB peripherals which are within the 500 mA USB spec in my opinion, that's just an added layer of complexity and cost and cable mess.

Yep. That said if you're really clever you could install the RPi inside a USB hub (or create a case for both) and connect it directly. It can also be simplified to an extent as then you can connect everything to the hub and avoid the mess being around the Pi.

The PPTCs should be rated higher, there's no reason why they can't be, as long as the user understands that it's their own responsibility to provide a 5V power supply with appropriate current capacity to run the RPi plus peripheral devices.

I wouldn't say there is no reason. I haven't done much research into it, but if they've used thin tracks and you try and put too much current through it its going to end badly. Although if, as you say, its specced for 1.1A then I'd see no problem with that.

The RPi's onboard linear regulators provide its 3.3V and 1.8V rails, you provide the 5V rail externally and there is no 5V regulator on board.

Yeah. I was just a little sloppy with my terminology.

[scorpia]

Originally Posted by Rezin

Thanks, be good if you could give 'bottom holes.stl' and 'top holes.stl' from this one a go for me!

When you're not busy, PM me to arrange payment details and addresses, etc.

Hi rezin,

your case printed ok.
see...


IMG_7975.jpg by Scorpia21, on Flickr

IMG_7974.jpg by Scorpia21, on Flickr

IMG_7973.jpg by Scorpia21, on Flickr

if your happy then let me know and ill pass on acct number etc.

daehenoc, im about to have another go at your case. see if i cant get it better.

[Rezin]

Looks good! Hopefully the non-fishbone type covers (those angled grill ones) made it easier to print. PM incoming.

[Menthu_Rae]

Originally Posted by scorpia

Hi rezin,

your case printed ok.
see...

image
IMG_7975.jpg by Scorpia21, on Flickr
image
IMG_7974.jpg by Scorpia21, on Flickr
image
IMG_7973.jpg by Scorpia21, on Flickr

if your happy then let me know and ill pass on acct number etc.

daehenoc, im about to have another go at your case. see if i cant get it better.

What 3D Printer do you have? I think you need to do some work on calibration/setup...

[mtma]

I did a pilot print of my case in PLA today.


Click to view full size!

Click to view full size!

Click to view full size!

It doesn't look anywhere as good as the CAD though The black bit on the cover is a bit of renegade ABS that came off the bed :/


Click to view full size!

I gotta tweak a couple of details and print it in ABS eventually, the snap fits really don't work in PLA at all but it still snaps together regardless.

The CAD models they have on the rpi wiki are a bit off, there seems to have been a couple of material substitutions and design adjustments between the CAD and the actual thing you get.

[Baker]

I've just (well, last week) received my Pi, at this stage playing with XBMC.

I'm running it from an iPhone charger I had lying around.

I've tried RaspBMC and Xbian (www.xbian.org), Xbian seems to be a bit snappier, but fiddling with both.

Streaming 720P MKV's from the network isn't 100% yet (using SMB), but I'm working on it.

[scorpia]

Originally Posted by Menthu_Rae

What 3D Printer do you have? I think you need to do some work on calibration/setup...

yeah, its a bit rough. but considering i think its doing ok.

but you did prompt me to install the latest firmware which should help it once i fiddle a bit more .

see...


IMG_7976.jpg by Scorpia21, on Flickr

[Menthu_Rae]

Originally Posted by scorpia

yeah, its a bit rough. but considering i think its doing ok.

but you did prompt me to install the latest firmware which should help it once i fiddle a bit more .

see...

image
IMG_7976.jpg by Scorpia21, on Flickr

Are you taking the mickey or something dude?

[Rezin]

Originally Posted by Menthu_Rae

Are you taking the mickey or something dude?

Bit too elaborate if he is, don't you think? Why couldn't there be a home made version?

[scorpia]

nope, perfectly serious.

its based on a wolfstrap on the reprap site from about 2 years ago.

I couldnt afford to buy the printed parts at the time as they were running at about $500-$600 a set just for the plastic. so i built the frame you see in the pic.

its not the best pic. if you like i can post more details in the reprap thread as this is getting this thread a bit off topic.

but having said that. the prompt you gave me made me update the firmware and i think with a full calibration it will work better than it was. I still have some physical issues with the frame but its not bad considering the whole thing is about $400 total

[FiShy]

Originally Posted by scorpia

yeah, its a bit rough. but considering i think its doing ok.

but you did prompt me to install the latest firmware which should help it once i fiddle a bit more .

see...

image
IMG_7976.jpg by Scorpia21, on Flickr

that is fucking fantastic!

[3th4n]

I've been having heaps of awesome fun with my Pi lately. Getting more and more familiar with the terminal & ssh along the way. Really should get a few more SD's so I don't need to remember to make a backup image.

One thing that is really a massive bummer is that there's no flash support. I know people have been whining about it, but its literally the only thing stopping me from using it as my daily/internet machine since I watch a fair bit of youtube. Are there any browsers for the pi that support HTML5 yet?

[scorpia]

support html 5 or support it well?

either way i think i remember reading that iceweasel supports html5.

worth a try at least