Hi!
Just found out about this project, very exciting. I'd recommend that
developers consider attending the Decentralized Web Summit
<https://decentralizedweb.net/> that starts on July 31st. I believe that
folks that work on SSB will be present so might be a great opportunity to
collaborate.
I do know that there will be a humanitarian track; so again, this project
is a perfect fit.
Oh, and hi! I'm Paul. Sudo Room member lurker, Oakland resident and coder.
Happy to meet everyone
Paul
this might be the same thing Fitz already designed for the disaster radio
system, to manage solar charge and battery stuff, or maybe its design or
production could improve our situation, i don't know:
"Solar Power Manager 5V is a small power solar power management module designed
for 5V solar panel. It features as MPPT (Maximum Power Point Tracking)
function, maximizing the efficiency of the solar panel, suitable for various
solar power projects."
https://www.dfrobot.com/product-1712.html
hey adam, this is rad!
fyi there's also a disaster.radio mailing list (fwd'ing)
---------- Forwarded message ---------
From: Adam <me(a)adammunich.com>
Date: Wed, Apr 25, 2018, 21:39
Subject: [sudo-discuss] diaster.radio modulation scheme tests
To: Sudo room <sudo-discuss(a)lists.sudoroom.org>
Hi all,
I ran some tests on LORA modulation schemes to get the best results I could
on a 100mW TX power budget.
I nearly ran out of gas during this latest test, and unfortunately I
managed to screw up my data logging, so I don't have RSSI or SNR data, but
this map contains all the places I stopped and got a two way signal on my
jet ski.
The transmitter was in my hand, the receiver was at pier 50, SF.
DIY half wave dipoles were used, with a center freq of 900MHz with a +/-
100MHz 3db roll off.
https://www.google.com/maps/d/u/0/edit?mid=1dE2QZS9cgX_oHLWyzmUNAYrjlbX0wJp…
I found that quarter wave antennas are no good (see the red markers). The
blue markers are today's test, using RFM95's from HopeRF.
To get the very long range, I used the following modulation scheme using
the RadioHead library.
RH_RF95::ModemConfig modem_config =
{
/*Reg 0x1D: BW=125kHz, Coding=4/8, Header=explicit*/
(7 << 4) | (4 << 1) | (0),
/*Reg 0x1E: Spread=4096chips/symbol, CRC=enable*/
(12 << 4) | (1 << 2),
/*Reg 0x26: LowDataRate=On, Agc=On*/
(1 << 3) | (1 << 2)
};
RF95.setModemRegisters(&modem_config);
In other news, you can still jet ski if your core body temp is 88F. Little
unpleasant though.
- - - - Begin automatically generated footer - - - -
I seek to understand, and aim to create.
Weblog: http://adammunich.com
PGP Public Key: https://pgp.mit.edu/pks/lookup?search=adam+munich
_______________________________________________
sudo-discuss mailing list
sudo-discuss(a)lists.sudoroom.org
https://sudoroom.org/lists/listinfo/sudo-discuss
