here's how i solved it using a single pushbutton to safely turn on and off 
the bbb...
https://github.com/redFrik/udk10-Embedded_Systems/tree/master/udk140123#--start-stop-button
comments welcome.
_f

On Tuesday, January 28, 2014 5:33:14 PM UTC+1, [email protected] wrote:
>
> I'm working on a PCB now to mate with some software to allow the user to 
> press a button, which will send a long GPIO signal to the ARM system.  A 
> daemon process monitors that GPIO and does an orderly shutdown when it goes 
> low.   The daemon also sets another GPIO high as it begins to shutdown.   
> When that line falls low again after the board powers down then the 
> external power switch cuts the power completely.  This was designed to plug 
> into my own power distribution board for a robot.
>
> Might be not-to-difficult to make up a carrier board for that PCB that 
> just feeds the BBB (or a RaspPi) with a barrel connector and a two-pin 
> cable.  If the prototypes function right I could send you one.
>

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