[Space] More goodies for the payload

Christie Dudley longobord at gmail.com
Fri Mar 19 10:15:39 PDT 2010


That's good to know!  I was reading somewhere about good low-temperature
performance of lithiums, which confused me.  Now the tricky part is I think
I need between 5 and 7 V, but less than 0.2 Ah.  That would require 4 AA
batteries...  That would be about 4 times the size and weight of this tiny
little board I'm wanting to add.

I'll look into watch batteries...  Thanks for the heads up on the lithium,
though.

Christie
_______
"We also briefly discussed having officers replaced by very small shell
scripts." -- Noisebridge meeting notes 2008-06-17

The outer bounds is only the beginning.
http://www.flickr.com/photos/genriel/sets/72157623376093724/


On Fri, Mar 19, 2010 at 1:47 AM, Adam Greig <random at randomskk.net> wrote:

> Hi Christie, Noisebridge,
>
> We've found lithium batteries very reliable for high altitude projects
> -- plain lithium, as opposed to any of the rechargeable types. You can
> typically pick them up in a shop in AA format for a bit more than
> alkaline batteries, and they get 3Ah and approximately 1.8V per cell,
> so two are enough for a 3v3 system, or we have used four to feed a 5V
> linear regulator. They last for a very long time (3Ah!) and are not
> very affected by the cold. AA form factors have the additional
> advantage that battery boxes are readily available, including built in
> on/off switches.
>
> Rechargeable batteries obviously have some advantages but for the
> cost, weight and energy storage lithiums tend to work very well. If
> you do go the rechargeable route, LiPo batteries tend to fair well at
> high altitudes.
>
> Cheers,
>
> Adam Greig
> CU Spaceflight
>
> On 19 March 2010 08:33, Christie Dudley <longobord at gmail.com> wrote:
> > It seems my boss feels like I need more toys.  So I have in my grubby
> little
> > hands a tiny little board from Sparkfun - the package tracker I'd
> mentioned
> > earlier.  I'd like to see what kind of data we can collect from it and
> see
> > how that data compares to what we're pulling from the G1.
> > This nifty little device could also be used to actually log the
> coordinates
> > from the "good" GPS.  I'm looking at the protocol now to see what it'd
> take
> > to splice this into the output of that.  I also need to come up with a
> > battery, but since the thing only averages 31.7mA, meaning for a 5 hour
> > flight, it'll eat up only about 159 milliamp-hours.  I vaguely remember
> > people mentioning the best battery type to use, but since it's not
> written
> > down anywhere... I'm really curious about which types were researched.
> >
> > Christie
> > _______
> > "We also briefly discussed having officers replaced by very small shell
> > scripts." -- Noisebridge meeting notes 2008-06-17
> >
> > The outer bounds is only the beginning.
> > http://www.flickr.com/photos/genriel/sets/72157623376093724/
> >
> > _______________________________________________
> > Space mailing list
> > Space at lists.noisebridge.net
> > https://www.noisebridge.net/mailman/listinfo/space
> >
> >
>
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