Re: [Server-devel] (probably) the world's highest solar powered schoolserver and mesh setup

[Anish Mangal]

Mikko wrote some more about the Leh installation. Here is part two.

[Things I Learned Building the Skynet PART 2 — How to Eat Dust]
https://medium.com/@skynet.admin/things-i-learned-building-the-skynet-part-2-how-to-eat-dust-1a0c78a48fc7#.oc1bzbwcs

I also just returned from a month long trip to spiti valley (adjoining to
Ladakh, 14000ft, -10C) teaching locals to setup mesh networks and
schoolservers. It looks like they are setting those up in a couple of
villages in the valley.

Back in Dharamsala now improving the resilience of these devices and the
QoS of mesh networks.


On Fri, Sep 9, 2016 at 9:57 AM, Anish Mangal  wrote:

> Yes, we plan to put a temp & humidity logger in the box next time we
> deploy this (or maybe put one in these boxes). Frankly we didnt do much
> testing other than waterproofing testing before deploying this so would be
> very interesting to see how it holds up in the cold winters.
>
> Right now, we just used the buck converter with panel and without battery
> so the node switches off every evening.
>
> Thanks for sharing the paper, will go through it.
>
> On Thu, Sep 8, 2016 at 3:17 AM, James Cameron  wrote:
>
>> Good reading, thanks.  Looking forward to more.
>>
>> The clear bottle packaging of the routers in the photographs is
>> interesting.  Looking at the climate data for Leh;
>>
>> https://en.wikipedia.org/wiki/Leh#Climate
>>
>> my guess is that the bottle will make a good thermal environment;
>> spending the most time within the temperature range of the router.
>> Router radios become less sensitive as temperature increases.
>>
>> Charting inside and outside temperature would be interesting.
>>
>> At high altitudes my caution would suggest a watchdog circuit for the
>> DC to DC converter, to switch it off and then on again if the router
>> isn't responding.  Especially where batteries are used.  Where no
>> battery is used, a node will restart next morning, and that may be
>> enough to handle the more frequent single event upsets.
>>
>> http://www.dfrsolutions.com/pdfs/2004_HighAltitude_Hillman-Blattau.pdf
>>
>> --
>> James Cameron
>> http://quozl.netrek.org/
>> ___
>> Server-devel mailing list
>> Server-devel@lists.laptop.org
>> http://lists.laptop.org/listinfo/server-devel
>>
>
>
>
> --
> Anish
>
>
>


-- 
Anish
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Re: [Server-devel] (probably) the world's highest solar powered schoolserver and mesh setup

[Anish Mangal]

Yes, we plan to put a temp & humidity logger in the box next time we deploy
this (or maybe put one in these boxes). Frankly we didnt do much testing
other than waterproofing testing before deploying this so would be very
interesting to see how it holds up in the cold winters.

Right now, we just used the buck converter with panel and without battery
so the node switches off every evening.

Thanks for sharing the paper, will go through it.

On Thu, Sep 8, 2016 at 3:17 AM, James Cameron  wrote:

> Good reading, thanks.  Looking forward to more.
>
> The clear bottle packaging of the routers in the photographs is
> interesting.  Looking at the climate data for Leh;
>
> https://en.wikipedia.org/wiki/Leh#Climate
>
> my guess is that the bottle will make a good thermal environment;
> spending the most time within the temperature range of the router.
> Router radios become less sensitive as temperature increases.
>
> Charting inside and outside temperature would be interesting.
>
> At high altitudes my caution would suggest a watchdog circuit for the
> DC to DC converter, to switch it off and then on again if the router
> isn't responding.  Especially where batteries are used.  Where no
> battery is used, a node will restart next morning, and that may be
> enough to handle the more frequent single event upsets.
>
> http://www.dfrsolutions.com/pdfs/2004_HighAltitude_Hillman-Blattau.pdf
>
> --
> James Cameron
> http://quozl.netrek.org/
> ___
> Server-devel mailing list
> Server-devel@lists.laptop.org
> http://lists.laptop.org/listinfo/server-devel
>



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Anish
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Re: [Server-devel] (probably) the world's highest solar powered schoolserver and mesh setup

[James Cameron]

Good reading, thanks.  Looking forward to more.

The clear bottle packaging of the routers in the photographs is
interesting.  Looking at the climate data for Leh;

https://en.wikipedia.org/wiki/Leh#Climate

my guess is that the bottle will make a good thermal environment;
spending the most time within the temperature range of the router.
Router radios become less sensitive as temperature increases.

Charting inside and outside temperature would be interesting.

At high altitudes my caution would suggest a watchdog circuit for the
DC to DC converter, to switch it off and then on again if the router
isn't responding.  Especially where batteries are used.  Where no
battery is used, a node will restart next morning, and that may be
enough to handle the more frequent single event upsets.

http://www.dfrsolutions.com/pdfs/2004_HighAltitude_Hillman-Blattau.pdf

-- 
James Cameron
http://quozl.netrek.org/
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