[TriLUG] Raspberry Pi Power Supply

[R Radford]

>> The Raspberry Pi A and B boards are fused at 0.75A at the input so
>> can't draw more than this, so a 2A supply will be more than adequate
>> for the Raspberry Pi and any directly attached USB peripherals.
>
> Not any, just a few. :-)
> We may be saying the same thing

Pete, we are actually saying the same thing, but glad you clarified if
my comments were unclear.

The 2A power supply is more than adequate for any directly attached
USB peripherals that will "actually work" with the Raspberry Pi.  Pete
is very correct that you will need a powered hub for many USB
peripherals, specifically hard drives, some USB WiFis, and even some
keyboards (I had one that would cause the RPi's Ethernet to stop
working when plugged in).

I don't have a USB Wifi on mine as I plug the Ethernet into my laptop
and route the connection through the laptop's WiFi and set it up to
use a static IP. That allows me to plug my RPi into my laptop and just
ssh in and then connect back through the laptop. With that setup, I
don't have a mouse or keyboard or WiFi and I can power my RPi directly
off my laptop's USB.  I would be careful doing that though, as there
are reports of people burning out the USB on their laptop attempting
that, but it works fine for me.

And remember ... tomorrow is Pi day, so go order an RPi and grab a
slice a pie...

On Wed, Mar 13, 2013 at 5:44 PM, Pete Soper <pete at soper.us> wrote:
>
>
> On 03/13/2013 05:02 PM, R Radford wrote:
>>
>    Putting a >.75A power supply into the microUSB was relevant to a small
> number of early RPIs but is now a worthless urban legend that needs to be
> stamped out of existence.
>    Powered USB hubs are the only way to run power-hungry peripherals,
> practically defines as "more than a plain keyboard and mouse."
>
> -Pete
>
>
>>
>> If you run power hungry USB peripherals such as an external HD or
>> higher power WiFi adapter, you will need to run an externally powered
>> USB hub anyway to provide power to those peripherals.
>>
>> If you were to buy something new, I would go with a decent powered USB
>> hub as you can use it to both power the Raspberry Pi as well as
>> provide powered USB outputs.  However, since you already have a 2A
>> supply, I see no reason to buy anything else.
>>
>> On Wed, Mar 13, 2013 at 3:21 PM, John Mitchell <john280z at gmail.com> wrote:
>>>
>>> Should be OK if your USB peripherals aren't to many(and too power
>>> hungry).
>>>
>>> john mitchell
>>>
>>>
>>> On Wed, Mar 13, 2013 at 3:04 PM, Grawburg <grawburg at myglnc.com> wrote:
>>>
>>>> Anyone see a problem with using a 5V x 2A power supply (from my Lenovo
>>>> pad) for the R.P?
>>>>
>>>>
>>>> Brian Grawburg
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>
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