USB power drain
Hactar
the data+/data- lines, only the +5/GND lines. While I know LEDs use
little power, I'm kinda worried that all together they might add up to
somewhere near USB's specced max of 500 mA. I know there's an easy way
to check in Windows (somewhere in Device Manager, probably for the USB
controller), but how do I check in Linux?
--
-eben QebWe...@vTerYizUonI.nOetP royalty.mine.nu:81
Q: What did one photon say to the other photon?
A: I'm sick and tired of your interference. -- thebigmike1983 on Fark
Greg Russell
news:fte8u6-...@pc.home...
> I have several USB-powered Christmas-themed LED-lit ornaments. None use
> the data+/data- lines, only the +5/GND lines. While I know LEDs use
> little power, I'm kinda worried that all together they might add up to
> somewhere near USB's specced max of 500 mA. ... how do I check in Linux?
lsusb -v | grep Amp
Pascal Hambourg
Hactar a ï¿œcrit :
> I have several USB-powered Christmas-themed LED-lit ornaments. None use
> the data+/data- lines, only the +5/GND lines. While I know LEDs use
> little power, I'm kinda worried that all together they might add up to
> somewhere near USB's specced max of 500 mA.
IIRC, a device should not drain more than 100 mA unless being allowed by
the host controller. And for this you need the data lines.
JTF
> I have several USB-powered Christmas-themed LED-lit ornaments. None use
> the data+/data- lines, only the +5/GND lines. While I know LEDs use
> little power, I'm kinda worried that all together they might add up to
> somewhere near USB's specced max of 500 mA. I know there's an easy way
> to check in Windows (somewhere in Device Manager, probably for the USB
> controller), but how do I check in Linux?
>
> --
>
> Q: What did one photon say to the other photon?
> A: I'm sick and tired of your interference. -- thebigmike1983 on Fark
You may want to consider using a powered USB hub if you have more than
one device plugged in. The USB Hub will have its own power source and
not effect your system.
Hactar
Just for kicks, I unplugged all of the toys. "03eb:0902 Atmel Corp."
went away. (One of the toys is a passive hub, into which the other toys
are plugged, and apparently that's it.)
For that device, I see this:
MaxPower 100mA
and this:
bHubContrCurrent 100 milli Ampere
and this:
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
but that doesn't represent actual power used, since one port on the hub is
empty.
I'm trying to figure out how many toys is too many to power and at what
point I should add a powered hub to the mix.
--
-eben QebWe...@vTerYizUonI.nOetP royalty.mine.nu:81
Answer: two spoonfuls in my cup, please.
Question: how much should I use? (why top-posting is bad)
http://www.fscked.co.uk/writing/top-posting-cuss.html
Charlie Gibbs
writes:
> Q: What did one photon say to the other photon?
> A: I'm sick and tired of your interference. -- thebigmike1983 on Fark
In the quantum mechanical version, it's one photon talking to itself.
Q: Is Schrodinger's cat alive?
A: Yes and no.
--
/~\ cgi...@kltpzyxm.invalid (Charlie Gibbs)
\ / I'm really at ac.dekanfrus if you read it the right way.
X Top-posted messages will probably be ignored. See RFC1855.
/ \ HTML will DEFINITELY be ignored. Join the ASCII ribbon campaign!
JTF
may get a gift which requires even more power.
One thing to watch is if you get a new hub, it has a max power output
greater than your current output and requirements if possible. You
can always daisy-chain powered hubs if you need more power as an
option......just some food for thought.
On Nov 29, 12:51 am, ebenZERO...@verizon.net (Hactar) wrote:
> In article <7ndphiF3ln5p...@mid.individual.net>,
>
> Greg Russell <m...@privacy.net> wrote:
> > "Hactar" <ebenZERO...@verizon.net> wrote in message
> >news:fte8u6-...@pc.home...
>
> > > I have several USB-powered Christmas-themed LED-lit ornaments. None use
> > > the data+/data- lines, only the +5/GND lines. While I know LEDs use
> > > little power, I'm kinda worried that all together they might add up to
> > > somewhere near USB's specced max of 500 mA. ... how do I check in Linux?
>
> > lsusb -v | grep Amp
>
> Just for kicks, I unplugged all of the toys. "03eb:0902 Atmel Corp."
> went away. (One of the toys is a passive hub, into which the other toys
> are plugged, and apparently that's it.)
>
> For that device, I see this:
>
> MaxPower 100mA
>
> and this:
>
> bHubContrCurrent 100 milli Ampere
>
> and this:
>
> Hub Port Status:
> Port 1: 0000.0100 power
> Port 2: 0000.0100 power
> Port 3: 0000.0100 power
> Port 4: 0000.0100 power
>
> but that doesn't represent actual power used, since one port on the hub is
> empty.
>
> I'm trying to figure out how many toys is too many to power and at what
> point I should add a powered hub to the mix.
>
> --
> -eben QebWenE...@vTerYizUonI.nOetP royalty.mine.nu:81
Trevor Hemsley
ebenZ...@verizon.net (Hactar) wrote:
> I'd guess each hub limits you to 500 mA
Each _port_ on a powered hub should be able to draw up to 500mA.
--
Trevor Hemsley, Brighton, UK
Trevor dot Hemsley at ntlworld dot com