So perhaps all I'll need is a small battery (recharged when DC power is 
available) attached to the pads on the BBB, and some software. I am looking 
for an orderly shutdown when DC power is removed - the sole purpose of the 
battery is to provide power just until the BBB can be shutdown properly. No 
need to be monitoring for a wakeup event (just power back on when DC power 
is restored). Can you point me to any examples of how to monitor the DC 
status (through I2C as you say below or any other way) and initiate the 
shutdown? Thanks.

On Friday, May 9, 2014 10:12:58 PM UTC-7, Ron B. wrote:
>
> ...
> So, for the shutdown, the cape itself doesn't do anything since that's a 
> software issue.  But since DC power status is reported through a status 
> register over I2C, I used that in a bash script while toying with a 
> "podcast car computer".  I haven't spent much time on it but it definitely 
> turns itself on and off with the car.  I guess the other option would be a 
> kernel module that monitors power good and initiates the shutdown...
>
> -Ron
>
>>
>>>>>

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