Hi!  It just so happens that my IEEE <https://www.facebook.com/byuidahoieee> 
group 
here at BYU-Idaho are putting together a flight computer for a rocket and 
used this to deploy our recovery system:

http://www.ebay.com/itm/221292380580?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

I can upload a schematic later but the idea is to have a 9V battery power 
the transistor which is triggered from an I/O pin from the BBB.  This 
battery also supplies the current to switch the relay after the I/O pin is 
triggered.  If your current draw is low enough, a transistor would work, 
but the BBB GPI/O pins output 3.3 V or you could use a 5V output pin that 
the board supplies to get the 5V directly.  

On Sunday, November 10, 2013 8:39:12 AM UTC-7, Bodo Kaiser wrote:
>
> Hello,
>
> I want to control a 5V battery-powered circuit through a relay.
>
> I am quite unsure which will work with the BeagleBoneBlack and a simple 
> GPIO input.
>
> Are there any recommendations?
>
> Best,
> Bo
>

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