what about power it by USB

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what about power it by USB

Postby Vaguereiz » Thu Apr 24, 2014 8:27 pm

Hi,
It is possible to power the parallella by USB like when we recharged our smartphone ?

Thanks.
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Re: what about power it by USB

Postby nmalinoski » Fri Apr 25, 2014 2:29 am

Vaguereiz wrote:Hi,
It is possible to power the parallella by USB like when we recharged our smartphone ?

Thanks.

I believe you can, because the power LED turned on when I connected a MicroUSB cable to the USB port on the MicroHDMI end of the board. I wasn't able to test beyond that, as I've been having difficulty getting everything hooked up (Not working with my monitors, no USB OTG adapter, etc).
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Re: what about power it by USB

Postby 9600 » Fri Apr 25, 2014 8:51 am

Should be fine for "light workloads", but if you experience any issues the first thing to do would be to try switching to powering the board via the barrel connector.

Cheers,

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Re: what about power it by USB

Postby Gravis » Fri Apr 25, 2014 2:37 pm

Vaguereiz wrote:It is possible to power the parallella by USB like when we recharged our smartphone ?

like 9600 wrote, you can but it may not be able to supply enough power when it comes to real workloads. if you have multiple chargers, you should select one with the highest mA rating (it's written on it). many are 500mA but some that can supply 2A(2000mA) of power in order to charge faster or larger devices like tablets. though for a few bucks you can get a gool power supply with barrel connector that can provide 4A, just so that you dont put any stress on it. Just be sure the connector is center-positive 5.5x2.1mm barrel connector.

for $10 you can get a good 4A power supply (ships from US, not China, so it wont take a month to show up).

if you are in the EU, they sell the same things with different plugs but you will have to search for them on your own.

i hope that helps! :)
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Re: what about power it by USB

Postby gceline » Fri Apr 25, 2014 3:12 pm

In addition to a good 2000mA USB supply, the USB cable is critical. We have one 2A USB supply which has a built in cable and a USB socket - the built in cable did not supply enough current. A good USB cable in the socket worked fine!
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Re: what about power it by USB

Postby Vaguereiz » Fri Apr 25, 2014 6:51 pm

Ok, it's works well.
However, the USB port just behind RJ45 do not work.
So I can powered it by USB, but I can't connect my keybord on the second USB.
And I can't put a Hub and in the same time plub the keybord and the power.
So I must need find a real DC power.
Over.
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Re: what about power it by USB

Postby zmc » Thu Jul 03, 2014 10:14 pm

I know this thread is a bit old, but I can't seem to find good information on this. I'm a noob so if someone in the know can correct me or confirm this information, please chime in.

According to this thread it should be okay to power the board using the usb port near the micro-hdmi connector for "light loads"

However, post: http://www.parallella.org/forums/viewtopic.php?t=841&p=5283 states that this connector (j6) was not designed to handle this amount of load, and it will fry your usb chip if used for extended periods.

According to the posts at https://groups.google.com/forum/#!msg/sdr-widget/VEuF-7E6lwk/BQgK0yFqGj4J the jumper near the barrel power connector, selects if the board is to be powered via the barrel connector or the USB port near it. Shorting the 2 pins closest to the barrel connector selects it, and shorting the 2 pins closest to the Zynq selects power via usb.

Powering the board this way does work, what I'm not sure about is the safety of this method. I hope that I didn't seriously shorten the life of the usb chip powering the board from the wrong end for a day or so. If anyone can confirm or deny this information and to what board revisions it applies to it would be excellent.
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Re: what about power it by USB

Postby 9600 » Fri Jul 04, 2014 8:47 am

You should never feed power in via the USB connector next to the HDMI one. If you have been doing and it stills work, I couldn't tell you if doing so shortened the life of your board — I'd guess not, but wouldn't like to say for certain.

Powering via the USB connector next to the Ethernet jack is fine for light loads, but I think I'd always use the barrel connector or power via the mounting hole pads, whenever I could.

Regards,

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Re: what about power it by USB

Postby adexmont » Fri Jul 04, 2014 10:10 am

You should never feed power in via the USB connector next to the HDMI one. If you have been doing and it stills work, I couldn't tell you if doing so shortened the life of your board


honestly sounds strange to me because if i try to provide power from my pc to the usb next to the eth port, parallella do not even light up one led.

sorry if i misunderstood the topic but wiht my skill and this forum i'm doing a lot of confusion.
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Re: what about power it by USB

Postby 9600 » Fri Jul 04, 2014 10:49 am

adexmont wrote:honestly sounds strange to me because if i try to provide power from my pc to the usb next to the eth port, parallella do not even light up one led.


And did you first move the jumper in front of the barrel connector, so that it is shorting the two pins nearest the Zynq chip?

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