Difference between revisions of "DisasterRadio"

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This page attempt to document the low-bandwidth disaster recovery mesh (DisasterRadio).
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= UHD gain selection =
= Introduction =


The command:
DisasterRadio is an off-grid (solar-powered) low-bandwidth long-range mesh network built on free and open source software and affordable open hardware.


  sudo uhd_find_devices
The nodes are small and entirely self-contained units that can be deployed simply by leaving them in a place with sun. They are intended for either manual or drone-deployment on rooftops or in windows. They use high gain omni-directional antennas on 915 MHz using the LoRa PHY (Chirp Spread Spectrum) to talk to each-other and a downward-pointing/inward-pointing high gain wifi antenna to talk to user devices (phones/tables/laptops) inside the buildings on which they are placed. They use a low-power microcontroller running a web server that lets anyone use the network as long as they have a device with wifi and a web-browser.


Should list the gain range for the TX or RX frontend of choice.
= Updates =
* Status as of 31 October 2017: [[User:nanomonkey]] and fritz received the custom PCB boards they designed. got one working tonight \o/
* Status as of June 10th 2017: Basic chat between two nodes working. A more fleshed-out website should appear here soon.


E.g. for the WBX TX frontend you get:
= Applications =


  Gain range PGA0: 0.0 to 25.0 step 0.1 dB
The in-development apps are secure chat and community resource mapping (an offline map that communities can use to add resources, like [http://tidepools.co/ tidepools]).


Make sure you're not looking at the gain range for TX when you're looking to receive or vice-versa, as the won't necessarily be the same!
= Technical Specifications =
* Bandwidth: < 2000 kbits/sec.
* Power: Nodes need at minimum a 6V, 3W solar panel plus a battery capable of 3600mAh


= GNU Radio UHD device selection =
== Components ==
All are initial estimations, probably missing a component or two and haven't scoured for bulk prices on everything [[User:Tunabananas|Tunabananas]]:
* [https://tinurl.com/y7sytmox ESP8266] - $2.50
* LoRa Transceiver - [https://www.digikey.com/products/en/rf-if-and-rfid/rf-transceiver-modules/872?k=RFM95 HackRF RFM95W] - $7 OR [Dorji DRF1276G](https://www.tindie.com/products/DORJI_COM/868mhz-915mhz-sx1276-module-drf1276g/) - $6
* [https://www.seeedstudio.com/fusion_pcb.html Custom PCB - ~180x120, 1 layer, 100ct] - $6.50
* [https://www.ebay.com/itm/GSM-900MHZ-Omnidirectional-Wireless-Module-Antenna-SMA-Head-5DBI-19cm/281782888586900MHz Directional WiFi Antenna 5dBi] - [https://www.tvc-mall.com/details/3w-6v-diy-monocrystalline-silicon-solar-panel-145mm-x-145mm-sku85020025a.html another option] - $3
* [https://www.ebay.com/i/121104191012?chn=ps&dispItem=1 Solar Panel - 6V, 3W, 120mAH] - [https://www.tvc-mall.com/details/3w-6v-diy-monocrystalline-silicon-solar-panel-145mm-x-145mm-sku85020025a.html another lead] - $5-6
* [http://www.dx.com/p/ultrafire-18650-3-7v-3600mah-batteries-pair-50486 LiOn Battery] - 3.7V 3600mAh - $4
OR
* LTO battery? - NEED TO RESEARCH COSTS
* [https://www.adafruit.com/product/2745 3.3V buck converter] - $5
* Enclosure - ~$5
'''* Total: ~$40'''


For a USRP 1 this should be in the form: serial=<hex_serial>. E.g:
= Documentation =
* Code is here: https://github.com/sudomesh/disaster-radio-nodemcu
* Documentation wiki is here: https://github.com/sudomesh/disaster-radio/wiki
* Network visualization simulation: https://jemucino.github.io/disaster-radio-netsim/


  serial=24e6b31a
== Presentations ==
[[User:juul|juul]] gave a [https://www.youtube.com/watch?v=tPJj3zCyRpI talk about this at the 2017 BATTLEMESH in Vienna]. [http://battlemesh.org/BattleMeshV10?action=AttachFile&do=get&target=disasterradio_juul.odp Slides]


To find device serial run:  
== User Research ==
[[User:Tunabananas|Tunabananas]] designed [http://wiki.tidepools.co/view/Ethnography use cases and user stories] for the decentralized mobile mapping application Tidepools in early 2013, based on open-ended interviews with community residents and various organizations engaged in technology equity and access.


  sudo uhd_find_devices
= Licensing =
* [https://github.com/sudomesh/disaster-radio/tree/master/firmware firmware/]: Dual licensed under both GPLv3 and AGPLv3
* [https://github.com/sudomesh/disaster-radio/tree/master/web web/]: AGPLv3


You're looking for output that looks like:
[[Category:DisasterRadio]]
 
|    _____________________________________________________
|    /
|  |      Mboard: USRP1
|  |  serial: 24e6b31a
 
To set the sub-device (the daughterboard and channel) use the format:
 
  <slot_name>:<daughterboard_frontend_id>
 
E.g:
 
  B:0
 
This slot_name and daughterboard_frontend_id are also findable with the command:
 
  sudo uhd_find_devices
 
The output you're looking for looks like:
 
|  |    _____________________________________________________
|  |    /
|  |  |      RX Dboard: B
|  |  |  ID: WBX, WBX + Simple GDB (0x0053)
|  |  |    _____________________________________________________
|  |  |    /
|  |  |  |      RX Frontend: 0
|  |  |  |  Name: WBXv2 RX+GDB
|  |  |  |  Antennas: TX/RX, RX2, CAL
|  |  |  |  Sensors: lo_locked
|  |  |  |  Freq range: 68.750 to 2200.000 Mhz
|  |  |  |  Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|  |  |  |  Connection Type: IQ
|  |  |  |  Uses LO offset: No
 
Specifically the lines:
 
|  |  |      RX Dboard: B
 
and:
 
|  |  |  |      RX Frontend: 0
 
Together making up the B:0.
 
== For command-line python scripts ==
 
For command line scripts, device and sub-device is often specified with the --args and --spec arguments. E.g:
 
  my_script.py --args serial=24e6b31a --spec B:0
 
This syntax may vary from script to script, but this is the most common syntax.
 
== For GNU Radio Companion ==
 
For the "UHD: USRP Sink" in the latest version of grc (as of this writing) the field "Device Addr" would be set to e.g. serial=24e6b31a and the field "Mb0: Subdev Spec" would be set to e.g. "B:0".
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