Re: [Gumstix-users] Question about Robostix power

[Jesse W. <jes...@gm...>]

Thanks for the reply Dave,
Yea, I was thinking of doubling up those 3.6 ones but.....I'm not quite sure
how. But I'm prety sure I need to
hook up two because a 7.2 lipoly is actualy two 3.6 cells. Bottom line is my
ESC has lipoly cut off for
however many cells I tell it. So as long as I charge them both and only use
them untill the ESC cuts
out I won't over discharge the one supplying the gumstix because the gumstix
should draw <500 mA where as my
motor and two servos should draw at least 1.5 amps (guessing here but one
servo is a scanning servo
which is constantly moving).

Thanks for the Help.

On 11/13/06, Dave Hylands <dhy...@gm...> wrote:
>
> Hi Jesse,
>
> On 11/13/06, Jesse Welling <jes...@gm...> wrote:
> > So I'm trying to use 7.2 lipolys to power my robostix/gumstix
> > 400xm-bt/netmmc stack (the ethernet will be powered down)
> > I'm wondering if this:
> > http://www.dimensionengineering.com/DE-SW0XX.htm will be
> > sufficient to step down my power to 5v so
> > I can avoid thermal problems with the onboard voltage regulator. The
> > question Is will this be adequate to use or is there something I'm
> missing?
> > Thanks for the help!
>
> It says that it has a 1.3v dropout voltage, so this means that it need
> 6.3v to operate. Since LiPolys should never be allowed to go below 3v,
> that seems like a pretty reasonable fit.
>
> I highly recommend using a protection circuit which cuts out the
> battery if the voltage goes too low. Something one of these:
> <http://www.all-battery.com/index.asp?PageAction=VIEWCATS&Category=178>
>
> --
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
>
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-- 
        -Jesse W.