[Space] More goodies for the payload
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,
"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.
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.
> 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
> > hands a tiny little board from Sparkfun - the package tracker I'd
> > earlier. I'd like to see what kind of data we can collect from it and
> > how that data compares to what we're pulling from the G1.
> > This nifty little device could also be used to actually log the
> > from the "good" GPS. I'm looking at the protocol now to see what it'd
> > 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
> > 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
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Space