Meshtastic

[last updated: 2020-05-08]
...
--------------------------------

• Broadly:
  Meshtastic is a software/hardware system that allows text messaging between Meshtastic-programmed LoRa radios in the (typ) 915 MHz band.
  Being such a high freq, range is limited by power and elevation, and is effectively limited to line-of-sight.
  However the software has a "store-and-forward" feature, so that, if you have sent a message to a particular recipient, and they are out of range,
  the software will scan for other Meshtastic radios (nodes) that ARE in range, and those nodes may in fact be in range of your desired recipient, and if so, they will be prompted to forward your message to its designated recipient.
  --------------------------------

• Details:
  • LoRa radios:
    • Invented in 2014 (?) by a French company, aquired (when?) by Semtech
      https://www.semtech.com/lora/what-is-lora
    • 902-928 MHz, no license required.
      However some devices are listed as 433 MHz ???
    • Use CSS ("chirp spread spectrum") protocol
      to enhance range and data integrity
    • Range 2-5 Km, urban, perhaps 15 Km suburban/rural
  • Power:
    typ 10-25 mW
  • Meshtastic software:
  • LoRaWAN
    Classes: A, B, and C
    LoRaWAN data rates range from 0.3 kbit/s to 50 kbit/s per channel.
  • Modules:
    Transceiver
    Telemetry
    Modem

  --------------------------------

• LoRa sans Meshtastic:
  • Links:
    • https://www.actility.com/what-are-lora-and-lorawan/
    • https://www.amazon.com/REYAX-RYLR998-Interface-Antenna-Transceiver/dp/B0...
    • https://www.amazon.com/RYLR689-Wireless-Include-Antenna-Interface/dp/B0B...
    • https://www.mokosmart.com/what-is-a-lora-module/
    • https://www.amazon.com/dp/B0DZNHT81K/
    • Instructable - ESP32 gateway:
      • https://www.instructables.com/How-to-Program-ESP32-As-LoRa-Gateway-With-...
      • https://www.makerfabs.com/esp32-lora-gateway.html
      • LoRa relay: https://www.tindie.com/products/makerfabs/lora-relay-30a/
      • LoRa temperature/humidity/moisture sensor: https://www.makerfabs.com/lora-soil-moisture-sensor-v2.html

  ---------------------------------------------------------

• Telemetry:
  • The bands used for telemetry are described unofficially as the L band from 1435 to 1535 MHz, the S band from 2200 to 2300 MHz, and the upper S band from 2310 to 2390 MHz. While these band designations are common in telemetry parlance, they may have no specific meaning to anyone else.
  • search for: bidirectional lora
    and: lora arduino gateway
    ---------------------------------------------------------

  • Telemetry Links:
    • telemetry: https://meshtastic.org/docs/configuration/module/telemetry/
      https://www.reddit.com/r/meshtastic/comments/1d70k6q/using_meshtastic_fo...
      https://www.hackster.io/Adrelien/how-to-add-telemetry-sensor-to-heltec-l...
    • https://www.youtube.com/playlist?list=PLshzThxhw4O5JTOACGHzYSSd3soDhoXKK
    • https://www.amazon.com/LILYGO-ESP32-S3-LORA-89-Keyboard-Development/dp/B...
    • https://store.rokland.com/products/lilygo-ttgo-meshtastic-t-echo-white-l...
    • https://www.etsy.com/listing/1667607664/lilygo-t-deck-wsma-snap-case-mes...
      https://store.rokland.com/products/lilygo-t-deck-portable-microcontrolle...

  ---------------------------------------------------------

  
  ---------------------------------------------------------

.

eof