So thinking about the limitations of mesh networks in general, and wondering how your LoRa network would scale.
I'm guessing that in common with WiFi mesh reducing the traffic would help, particularly if you ended up with a fairly high node density and a well-used & congested network.
So I was wondering if it would be possible to pass off local traffic to a WiFi mesh? (Run on the same hardware) So if I want to communicate with my neighbour two streets away it goes over WiFi, if it's someone on the other side of town it would go over LoRa?
In this implementation: https://gitlab.com/BlackEdder/painlessMesh/wikis/home
"painlessMesh does not create a TCP/IP network of nodes. Rather each of the nodes is uniquely identified by its 32bit chipId which is retrieved from the esp8266/esp32 using the system_get_chip_id() call in the SDK. Every node will have a unique number. Messages can either be broadcast to all of the nodes on the mesh, or sent specifically to an individual node which is identified by its `nodeId."
So could the node could look in its list of connections: https://gitlab.com/BlackEdder/painlessMesh/wikis/home
If it has a route over WiFi then send the packet that way, if there is no route over WiFi (Or it's more than X hops away) then broadcast it over the LoRa interface instead.
I'm guessing this long range mode is incompatible with the 'Painless mesh' but it could be interesting to look at that too.
https://blog.honzamrazek.cz/2017/08/testing-the-wifi-range-of-esp32/
I guess using wifi & LoRa would have power implications?
Thanks
Sam
noffle started a doodle last week on patchwork for scheduling up our next
call:
https://doodle.com/poll/44s6bvwufcunkdtd
please mark which days you're available the last week of january!
For reference:
- Minutes from Call #1
<https://hackmd.io/KYIwZgrAxgzCDsBaADBATATkQFgGzCkQA4YATMRU0gQ2rVyhAEYJgig=#>
- Minutes from Call #2
<https://hackmd.io/CwY2DMFYHZ3BaARgZgKYOAEwEwIBwCGE8AjJociQGxV43hA=>
- DisasterRadio NSF/Mozilla WINS Grant Submission Draft
<https://hackmd.io/EYdgpmDMCcAmAMBaSBGeJEBYBm8WOgCZsNpgwBWYlCkSWFIA#>
Action Items from last call:
- @juul <@22YV3HX/BGClXH49ZebkcepqRpj7a9f5s0ddwhDSfxk=.ed25519>:
technical documentation [done], fix chat bugs [?], video production [done[
** keep libraries small (esp8266). cap of 2-3 MB on device, bundle
should be less than 100 KB, ideally less. Need to test load speed
@nanomonkey <@+D0ku/LReK6kqd3PSrcVCfbLYbDtTmS4Bd21rqhpYNA=.ed25519>:
circuitboard finalized and hopefully ordered [done:
https://github.com/nanomonkey/lora-to-nodemcu-circuit ]
- @noffle <@C3iYh/12sO1uvKq1KcZXLFxSySzxOkHxXN8rtNB5MGA=.ed25519>: read
documentation, try chat app [?]
- @Piet <@U5GvOKP/YUza9k53DSXxT0mk3PIrnyAmessvNfZl5E0=.ed25519>: get
kicad going, look at the designs [?]
- sierk: graphics and website, help with video [done]
- @cel <@f/6sQ6d2CMxRUhLpspgGIulDxDCwYD7DzFzPNr7u5AU=.ed25519>: get the
web app working, think about ssb over the protocol
- @tunabananas: finish the 501c3 application this week [done, and status
approved!], shift to storytelling use cases [MORE TODO], hack on submission
questions text [done]
- @mix <@ye+QM09iPcDJD6YvQYjoQc7sLF/IFhmNbEqgdzQo3lQ=.ed25519>: get web
app working, review / feedback on any writing [?]
--
Jenny
Help open a people-powered common space in Oakland, California!
https://omnicommons.org/donate
`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
"Technology is the campfire around which we tell our stories."
-Laurie Anderson
"Storytelling reveals meaning without committing the error of defining it."
-Hannah Arendt
"To define is to kill. To suggest is to create."
-Stéphane Mallarmé
"Anything done for the first time unleashes a demon."
--Dave Sim, "Cerebus the Aardvark"
~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
Hi I'm Sam
I was involved in the now defunct http://www.bristolwireless.net/about-us/ for about 10 years, more recently I helped start The Things network in Bristol. I was thinking about hacking together one of these: https://github.com/dmahony/Lora-Chat-Device
When I found your project :) I'm curious how you're handling routing?
Could the Mesh datagram protocol from Serval be any use to you?
https://github.com/servalproject/serval-dna/blob/development/doc/Mesh-Datag…
Or is it too heavyweight for the LORA side?
I also read on your mailing list that you've had a few boards made up, would you consider shipping a couple to the UK?
Thanks
Sam
Hi All,
I've been thinking a bit about solar charging and have come up with a few
options.
First, this is a pretty good application note laying out the basics of
Maximum Power Point Tracking for solar panels:
http://www.microchip.com/wwwAppNotes/AppNotes.aspx?appnote=en561417
Also, this is a good overview of charging Li-Ion batteries in general:
http://sound.whsites.net/articles/lithium-charging.htm
Here are some ideas with pros/cons and approximate costs at 1000 and 10
quantities.
1. Use reputable MPPT ICs
BQ24650 ($2 @1k, $4 @10)
http://www.ti.com/product/BQ24650
LT3652 ($3 @1k, $4 @10)
http://www.linear.com/product/LT3652
LTC4121 ($3 @1k, $4 @10)
http://www.linear.com/product/LTC4121
Pros:
High Efficiency
Excellent Documentation and Support
Available at all major parts distributors
Wide input voltage range
Reliability/long part lifetime
Cons:
Cost
2. Use Chinese brand MPPT ICs
CN3791 (maybe $0.35 @ 1k, $0.68 @10)
http://www.consonance-elec.com/seriesCN3791-E.html
Pros:
Wide Input Voltage Range
Decent Datasheet
tons of working modules available from Ebay/Aliexpress
Cons:
Less Efficient (I believe they use fractional open voltage MPPT)
Not widely available from US parts distributors
Unknown Quality/Reliability (probably good though)
3. Use Name Brand Li-Ion Charging IC
MCP73831 ($0.40 @1k, $0.50 @10)
Pros:
Simple/Compact
Widely Available
Reliable
Cons:
Low Input Voltage Range
Bad Efficiency (No MPPT built in)
4. Use Chinese Ultra Low Cost Charging IC
JZ4054 ($0.06 @1k, $0.10 @10)
http://www.szjingzhong.com/enproduct_show.html?id=26
Pros:
Lowest cost IC for charging Li-Ion batteries
Same footprint as MCP73831
Reliable in my experience
Cons:
Poor Documentation (No English)
Not Available from US Distributors
Low Input Voltage Range
Bad Efficiency (No MPPT built in)
5. Bootleg MPPT onto option 3 or 4
This is an idea I have, not 100% sure that it will work, but its worth
experimenting. The Wemos chip would monitor the Solar Cell voltage and
adjust the charger current with PWM to maintain the maximum power point.
Here's the basic circuit:
[image: Inline image 1]
Pros:
Lower Cost (only requires a few extra components)
Decent Efficiency
Cons:
Requires Wemos control (maybe updating once a second)
Complexity
time to test and implement
Also, I recommend this chip for buck controverting (stepping down the Li-po
voltage to 3.3V):
PAM2305 ($20 @1k, $0.40 @10)
https://www.diodes.com/products/power-management/dc-dc-converters/integrate…
-Fitz
Hi Team,
Here's a sketch video for Disaster Radio. Some parts still need to be
finished, mostly the app interface examples. If everyone could share a
short video or photo of their face, then I can upload that to the "open
community of volunteers" section.
If anyone has recommendations for the soundtrack, or other suggestions
for the video, I'm all ears.
https://youtu.be/HYw7J-zlf8g
Please provide videos of yourself or feedback by tomorrow so we can
upload the final for that application.
Thanks!
Sierk, Grant and Jenny hacked on the website all night (and of course Nic
made the logo), and the .radio TLD went into general availability about an
hour ago so we just now registered disaster.radio and the website is LIVE!
https://disaster.radio/
Hurray!
--
marc/juul
It'd be really cool if we could get a short clip of video from everyone of
themselves, either looking/waving at the camera or working on their
computers / in their hackerspaces then Nic can add it to the video!
If you have a webcam on linux you can use cheese to make this video really
quickly:
`apt install cheese`
--
marc/juul
Do read - paper on alternative internet in cuba!
Jenny
Help open a people-powered common space in Oakland, California!
https://omnicommons.org/donate
`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
"Technology is the campfire around which we tell our stories."
-Laurie Anderson
"Storytelling reveals meaning without committing the error of defining it."
-Hannah Arendt
"To define is to kill. To suggest is to create."
-Stéphane Mallarmé
~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
---------- Forwarded message ----------
From: Eddy Robinson <anigbrowl(a)gmail.com>
Date: Mon, Nov 13, 2017 at 10:54 AM
Subject: [sudo-info] Of interest for your SudoMesh project
To: info(a)sudoroom.org
https://conferences.sigcomm.org/imc/2017/papers/imc17-final186.pdf
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