[clug] ATX r pi

Logan McLintock u4955237 at anu.edu.au
Mon Nov 18 03:16:06 MST 2013

Wow, thank you so much for all the help guys! 

1st - Yes (after researching) the power supply will want to run something of substance, some people run a car bulb just to keep it happy lol (that seems like extra heat to me)
2nd - Yes I think that a usb hub is a much more sensible choice (as opposed to an ATX power supply) - thank you for the suggestion
3rd - I wouldn't have checked the proper electricity requirements! - thanks - i will look for that hub at Bunnings =)

I just have two questions:
* can I run multiple R pi's off the same hub (I have 4 of the model B's)?
* And, if it is plugged into a hub, do you not need the micro usb power as well?


On 18/11/2013, at 8:34 AM, Rodney <rodneyp at pcug.org.au>

> I like (and use) that general approach.
> I have a pi B running as a firewall/router and power it via an old 2.5 A 
> powered USB 1.1 hub.  12 Mb/s is adequate for my modem & WAP via USB/Ethernet 
> adapters.  I do have a modern USB 2.0 powered hub having a 2 A plugpack, but 
> reserve that for my low wattage desktop, which has only 4 USB ports.
> Hardware specs for the pi are hard to come by.  Archlinux suggest that the 
> model B can draw 1200 mA at full tach & pi are known to crash/lock on 
> inadequate power.  Archlinux also suggest that early Pi could deliver only 140 
> mA in aggregate to the USB ports.  lsusb is an essential command for pi users.
> BTW, the pi (and I gather many ARM based devices) effectively use the USB bus 
> as their I/O bus.  The pi uses a SMSC LAN9512 chip that is designed 
> specifically for that style of use.  It is primarily a USB controller but also 
> provides 10/100 Ethernet from it as well as driving LED etc.  Gigabit 
> Ethernet/USB adapters are an oxymoron at the best of times and particularly so 
> with a pi.
> BTW2, pi have recently changed to Hynix memory chips and that requires a 
> different compilation, which some distros are not doing.
> http://planet.ipfire.org/search?q=arm
> Rod 
> On Sun, 17 Nov 2013 12:00:06 linux-request at lists.samba.org wrote:
>> Message: 1
>> Date: Sun, 17 Nov 2013 06:23:02 +1100
>> From: Brians <brians at en.com.au>
>> To: linux at lists.samba.org
>> Subject: Re: [clug] ATX r pi
>> Message-ID: <5287C616.8030907 at en.com.au>
>> Content-Type: text/plain; charset=ISO-8859-1
>> The rpi has only two USB ports which are often used by a keyboard and
>> mouse and then you need a few more ports ie memory stick, external 2
>> 1/2"  harddisk etc
>> A powered USB hub is often used to provide more USB ports and also if
>> the hub has a 2 amp or more external power supply provide the 5VDC to
>> power the rpi itself.
>> A model B rpi only uses around 800mA or around 4 watts.
>> Bunnings have a 2000 mA 5VDC seven usb port powered hub for around $30
>> which works well with a rpi.
>> Jaycar and many other places sell powered usb hubs, just make sure that
>> it has a minimum 2 amp supply.
>> Alternatively use a spare USB phone charger or a cigarette lighter usb
>> car charger.
>> On 17/11/13 05:42, John Mills wrote:
>>> On Sat, Nov 16, 2013 at 12:46:47PM +0000, Logan McLintock wrote:
>>>> Date: Sat, 16 Nov 2013 12:46:47 +0000
>>>> From: Logan McLintock <u4955237 at anu.edu.au>
>>>> Subject: [clug] ATX r pi
>>>> To: "linux at lists.samba.org" <linux at lists.samba.org>
>>>> Hello my friends,
>>>> I and working on a holiday project (my exams went well) and I want run a
>>>> raspberry pi off an ATX power supply?>
>>> You might want to be aware, especially for testing and for a low-current 
>>> application, that some PC power supplies will only run with a certain 
>>> minimum load.
>>> http://www.tomshardware.com/reviews/power-supply-specifications-atx-refere
>>> nce,3061-13.html>
>>> (Hmm, this text is very similar to my Mueller 5th edition...)
>>> John Mills
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