PandaStack

Chris Tyler's Blog

PandaStack Tue, Feb 22. 2011


Our "PandaStack" of PandaBoard builders (shown here with 9 of the 15 builders installed) is now ready to run as part of the Fedora ARM build farm. However, I've run into a weird problem -- the ATX power supply I bought to power the boards works fine with 1-3 boards, but Something Bad happens when a fourth board is connected. It's not a capacity issue as far as I can see; it seems to be related to noise. Time to borrow a scope and take a close look at waveforms ... in the meantime, we'll power some of the boards with the ATX supply and some with stand-alone power bricks.

Posted by Chris Tyler in CDOT, Facebook, Fedora, Fedora Planet, Mozilla Education Planet, opensource@seneca, PandaBoard Planet, Seneca Planet, TeachingOpenSource Planet Comments: (2) Trackbacks: (0)

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#1 - Philip Trickett said:
2011-02-22 12:40 - (Reply)

Might it be a grounding issue on the PCBs?

Are the mounting holes grounded or isolated?

Also, have you tried powering 4 boards when not stacked?

Nice Stack, BTW.

#2 - Michael Adeyeye said:
2011-02-23 02:56 - (Reply)

I can see you have started playing with the Pandaboards. I can't wait to lay my hands on mine. It should get here in the next couple of weeks.

I would like to visit Seneca again to see what you are doing and learn some new things. I hope the TOS community we would support the idea, when I request for a travel grant.


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