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

Anish Mangal anishmg at umich.edu
Sun Dec 11 22:31:50 EST 2016

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

[Things I Learned Building the Skynet PART 2 — How to Eat Dust]

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 <anishmg at umich.edu> 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 <quozl at laptop.org> 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 at lists.laptop.org
>> http://lists.laptop.org/listinfo/server-devel
> --
> Anish

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