[Space] More goodies for the payload
albert.alexander at gmail.com
Fri Mar 19 11:19:52 PDT 2010
We could power you off the 9v used for heating using a 5v lin reg.
At 32 mA the 5v regulator will burn off 1/8 W as heat, which we could use to
keep the battery warm.
On Fri, Mar 19, 2010 at 10:15 AM, Christie Dudley <longobord at gmail.com>wrote:
> 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/
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