https://github.com/AsamK/signal-cli/wiki signal-cli -u +18572850070 send -m "hallo from the cli again!" +17817756406 signal-cli -u +18572850070 receive
Using the ATmega1284 with the Arduino IDE: http://www.technoblogy.com/show?19OV
Mighty core -- https://github.com/maniacbug/mighty-1284p
minimal mqtt -- https://hackaday.com/2021/02/17/minimal-mqtt-with-micropython/
signal-cli rest api here
Serial input basics: https://forum.arduino.cc/index.php?topic=288234.0
Thoughts on radio setups ...
Thinking about establishing communication networks for off-grid locations ...
Cellular coverage is spotty. If it's available, then it's a good system; it's what people are used to; but it can also be fragile to power outages.
ideas: find the nodejs way of interpreting APRS
make a system that can get some standard message formats from internet / local lora, and combine with APRS, and show
make a 'feedmap' for belfast that shows all the gps feeds on one map
imagery over lora -- http://ssdv.habhub.org/KW03PL
slow scan digital imagery: http://tt7hab.blogspot.com/2018/04/the-lora-ssdv.html
General instructions -- http://www.technoblogy.com/show?19OV
Forum post suggesting cap between RESET and GND on UNO when burning: https://forum.arduino.cc/index.php?topic=347441.0
maybe this is a better mightycore to use ... https://github.com/MCUdude/MightyCore
YES indeed. looks like it's working ...
Mark's code ported to 328p: https://freesoft.dev/program/136302037
This looks good:
lora aprs here
more details here
reverse tunnel ssh here
kiss aprs here
this looks even more directly useful for kiss: https://github.com/josefmtd/arduino-kiss
arduino apros tracker here
more by that fellow here
https://github.com/jweers1/Aprs-Tracker/tree/master/Arduino/libraries/LibAPRS is the APRS library developed by the micromodem fellow;
and this repo pulls out particular functions from that lib and uses them in a simple manner
original library is here: https://github.com/markqvist/LibAPRS
Much more extensive version of Arduino APRS here: https://github.com/handiko/Arduino-APRS
Gnu radio test for APRS here: https://github.com/handiko/gr-APRS
Walkie talkie module http://www.dorji.com/docs/data/DRA818V.pdf
light aprs tracker https://www.qrp-labs.com/lightaprs.html
DIY walkie talkie https://www.radiojitter.com/walkie-talkie-arduino-shield/
generate aprs via arduino https://hamprojects.wordpress.com/2015/06/29/vhf-beacon-and-aprs-tracker-english-version/
WSPR tracker https://git.ok1kvk.cz/RAJlab/rajx-v5.0/
more references here: https://swharden.com/software/FSKview/wspr/
Seems like WSPR is optimized for longer-range, lower-power ... forward error correction. If one has ham license, is it permissible to transmit longer messages (not just location)?
minimal wspr transmit -- looks like a great place to start: http://blog.marxy.org/2018/12/minimal-wspr-transmit-with-arduino-and.html
another arduino wspr beacon project https://hamprojects.wordpress.com/2019/06/02/wspr-beacon/
similar project http://people.physics.anu.edu.au/~dxt103/472/wspr_tx/
wspr message types: https://dxplorer.net/wspr/msgtypes.html
using aprs while backpacking https://mthikes.com/backpacking-aprs/
messaging via aprs http://www.aprs.org/aprs-messaging.html
ism band clock here: https://www.silabs.com/documents/public/data-sheets/Si4421.pdf
jgromes radiolib https://github.com/jgromes/RadioLib --- wow!
nice arduino keyboard link https://hackaday.io/project/158454-mini-piqwerty-usb-keyboard
another nice tutorial link https://create.arduino.cc/projecthub/cameroncoward/64-key-prototyping-keyboard-matrix-for-arduino-4c9531
libaprs here: https://unsigned.io/projects/libaprs/
microaprs -- https://unsigned.io/category/microaprs/
standalone digipeater for micromodem: https://unsigned.io/digipeater-firmware/
and then ultimately, this: https://github.com/handiko/Arduino-APRS
lightaprs -- https://github.com/lightaprs/LightAPRS-1.0
nice thesis on all-in-one aprs tracker -- https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=1156&context=eesp
homebrew sdr -- https://swling.com/blog/2020/02/a-compact-homebrew-si5351-based-sdr/
replicate this! https://www.youtube.com/watch?v=V99YUq4r6Y8
that video allows for receiving aprs packets!
this is the project to replicate! http://www.kh-gps.de/dra.htm
sa818v -- https://www.youtube.com/watch?v=gDYYR8VvHMI
diy ham radio -- https://www.youtube.com/watch?v=WrztebNYmOA
https://www.youtube.com/watch?v=XIwYHRFHXjk -- rda1846
this is the one to focus on: https://www.youtube.com/watch?v=V99YUq4r6Y8&t=10s
available unlicensed bands -- https://predictabledesigns.com/most-important-decision-when-creating-wireless-product/
also this: https://swling.com/blog/2020/02/a-compact-homebrew-si5351-based-sdr/
simple fsq beacon https://gist.github.com/NT7S/f22db15865f485c51139
https://www.youtube.com/watch?v=v6B_womc6j8 -- fsq a new digital chat mode
https://www.youtube.com/watch?v=IfwCT3GyNac -- fsq
decoding digital modes https://cupano.com/index.html%3Fp=558.html
psk modem -- http://www.kk5jy.net/psk-modem-v1/
https://www.youtube.com/watch?v=7vH-dm-45WU -- review of ham radio modes
ft-8 sounds like weird siren songs
js8call -- https://www.youtube.com/watch?v=pipjA4ZsqU8
using js8call -- https://www.youtube.com/watch?v=pipjA4ZsqU8
js8call relays and messaging -- https://www.youtube.com/watch?v=vka7H7ks-VM
rf zero board! -- https://www.rfzero.net/
rf zero schematic - https://www.rfzero.net/downloads/rfzero_schematic_v12.pdf
interesting here: https://www.rfzero.net/downloads/rfzero_schematic_v12.pdf
installing js8call - https://www.youtube.com/watch?v=SdwR7yAVlZk&list=PL1QTYT4Qo9caJ2MaRG3D015f6aVK_D3ua
js8call mobile + aprs -- https://groups.io/g/js8call/topic/js8call_mobile_aprs/78293418?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,78293418
js8call baofeng -- https://www.youtube.com/watch?v=Y_teUXOdBS0
aprs position off-grid with js8call https://www.youtube.com/watch?v=dAiXsSMIkKY
watching aprs activities around you
js8call instead of aprs -- https://groups.io/g/js8call/message/9852
gps gridsquare -- https://www.youtube.com/watch?v=DpzC7g-gY44
fv1 based sdr -- https://circuitsalad.com/2020/11/13/the-fv-1-based-sdr-revisited/
-- this project does uses the si part to generate a wspr radio -- http://www.knology.net/~gmarcus/multifunction_files/w3pm_multifunction_project_2.pdf
short wave transmitter using si chip and arduino -- https://create.arduino.cc/projecthub/pu2clr/shortwave-arduino-transmiter-with-si5351-and-arduino-421602
list of tutorials on FSK -- https://www.youtube.com/results?search_query=si5153+fsk+
I wanted to capture here some of the different links of these radios (transmitters, receivers, and transceivers) based on a combination of an Arduino MCU and the SI5351 Clock Generator / Phase Locked Loop with an I2C interface.
(Here's an example of a module from Adafruit containing the SI5351 with some voltage translation and regulator on-board: https://www.adafruit.com/product/2045)
I think the most comprehensive and well documented/discussed of these projects is this one: https://github.com/threeme3/QCX-SSB The readme has some great info on the origins of this project, some nice schematics and block diagrams, details of operation, and a credits section at the end that gives the lineage of the technologies, circuits, and algorithms that influenced this project.
This project started as a mod to a Morse Code transceiver kit sold by QRP-Labs that added support for single-sideband voice and many digital modes and simplified the orginial circuit too! It's now moved beyond that to a design that can be built either as a mod to the original kit or with a custom PCB and parts ordered from various sources.
As mentioned, there's a new projection under discussion of building a more portable version of this design as well here: https://groups.io/g/ucx
If you look at the block diagram here: https://github.com/threeme3/QCX-SSB#technical-description it would be pretty easy to simplify the schematic and, hopefully dissect the code, to be just the parts required for the receiver.
I also found the link form the fellow in Turkey that did the receiver design.
Its block diagram is very similar to the receive part of the design above. I noticed that he just sends the baseband (audio) signal to a PC via an audio plug rather than bringing it into the Arduino for further processing, which is what the QCX-SSB does.
I also see that his latest blog topics are focused on doing his over version of the same UCX project that the QCX-SSB folks are working on now.
these chips for location are really interesting https://www.radiojitter.com/product/mc-1612-dg/
DORJI module VHF Band HAM Amateur Radio Module DRA818V Home : http://www.dorji.com/products-detail.php?ProId=55
ham radio module https://www.ebay.com/c/943323740
serial input basics
One of the modules has a solder ball on the PCLK trace. The other module appears to be fine. I'll update my review once I capture a couple of images from them. Update: Both camera modules work. Documentation is the absolute worse. The default color settings don't appear to work properly. The secret to YUV with correct colors is writing address 0xB0 with 0x84 (This is a reserved register. I have no idea what this does). I used these coefficients for the YUV to RGB conversion r = y + 1.371*(v-128); g = y - 0.698*(v-128) - 0.336*(u-128); b = y + 1.732*(u-128);