longfi-arduino/TTGO-TBeam-Tracker

TTGO T-Beam Tracker for use with a LoRaWan Networks

This code was originally developed for use on The Things Network (TTN) it has been editied/repurposed for use with the Helium Network.

This TTGO device application uploads GPS data from the TTGO T-Beam to be used for tracking and determining signal strength of LoRaWAN gateways and nodes. When using the device and application on the Helium Network one can contribute to the Helium Network Mapper or Cargo projects. Details for the Mapper project can be found here and details for Cargo can be found here

Current version: 1.2.1

This version is based on a forked repo from github user [kizniche] https://github.com/kizniche/ttgo-tbeam-ttn-tracker. Which in turn is based on the code from xoseperez/ttgo-beam-tracker, with excerpts from dermatthias/Lora-TTNMapper-T-Beam to fix an issue with incorrect GPS data being transmitted to the network. Support was also added for the 915 MHz frequency (North and South America). lewisxhe/TTGO-T-Beam was referenced for enabling use on the newer T-Beam board (Rev1).

This is a LoRaWAN node based on the TTGO T-Beam development platform using the SSD1306 I2C OLED display. It uses a RFM95 by HopeRF and the MCCI LoRaWAN LMIC stack. This sample code is configured to connect to The LoRaWan network using the US 915 MHz frequency by default, but can be changed to EU 868 MHz.

NOTE: There are now 2 versions of the TTGO T-BEAM, the first version (Rev0) and a newer version (Rev1). The GPS module on Rev1 is connected to different pins than Rev0. This code has been successfully tested on REV0, and is in the process of being tested on REV1. See the end of this README for photos of each board.

Setup

1. Follow the directions at espressif/arduino-esp32 to install the board to the Arduino IDE and use board 'T-Beam'.
   In summary, within the Arduino IDE open Boards Manager from Tools > Board menu and search for and install the "esp32" platform (and don't forget to select your ESP32 board from Tools > Board menu after installation).

2. Install the following Arduino IDE libraries:

   1. mcci-catena/arduino-lmic (for Rev0 and Rev1)
      Executing git clone https://github.com/mcci-catena/arduino-lmic.git within the Arduino project's libraries directory should install the proper and latest version of the library.

   2. ThingPulse/esp8266-oled-ssd1306 (for Rev0 and Rev1)
      Executing git clone https://github.com/ThingPulse/esp8266-oled-ssd1306.git within the Arduino project's libraries directory should install proper and the latest version of the library.

   3. mikalhart/TinyGPSPlus (for Rev0 and Rev1)
      Executing git clone https://github.com/mikalhart/TinyGPSPlus.git within the Arduino project's libraries directory should install the proper and latest version of the library.

   4. lewisxhe/AXP202X_Library (or Rev0 and Rev1)
      Executing git clone https://github.com/lewisxhe/AXP202X_Library.git within the Arduino project's libraries directory should install the proper and latest version of the library.

3. Edit arduino-lmic/project_config/lmic_project_config.h and uncomment the proper frequency for your region.

4. Edit this project file main/configuration.h and select your correct board revision, either T_BEAM_V07 or T_BEAM_V10 (see T-BEAM Board Versions to determine which board revision you have).

5. Within your project edit main/credentials.h to add the device OTAA keys, Device EUI, App EUI and App Key. These can be found within the device configuration within the Helium console. Be sure to pay special attention to the required format when adding these credentials.

6. Within the Helium Console, add a Mapper or Cargo integration.

• step by step details for setting up a Mapper integration can be found here.
• detail for setting up a Cargo integration can be found here.

The specific details for adding a Mapper or Cargo integration use a different edge node device than the one detailed here. When prompted to add a function decoder, be sure to use the following decoder. Note: This decoder can also be found within this project in the console-decoders directory.

function Decoder(bytes, port) {
    var decoded = {};

    decoded.latitude = ((bytes[0]<<16)>>>0) + ((bytes[1]<<8)>>>0) + bytes[2];
    decoded.latitude = (decoded.latitude / 16777215.0 * 180) - 90;

    decoded.longitude = ((bytes[3]<<16)>>>0) + ((bytes[4]<<8)>>>0) + bytes[5];
    decoded.longitude = (decoded.longitude / 16777215.0 * 360) - 180;

    var altValue = ((bytes[6]<<8)>>>0) + bytes[7];
    var sign = bytes[6] & (1 << 7);
    if(sign) decoded.altitude = 0xFFFF0000 | altValue;
    else decoded.altitude = altValue;

    decoded.hdop = bytes[8] / 10.0;
    decoded.sats = bytes[9];

    return decoded;
}

7. Open this project file main/main.ino with the Arduino IDE Verify/Compile the project. If the compile is successful upload the application to your TTGO T-Beam.

8. Disconnect and turn on the device and once a GPS lock is acquired, the device should start sending data to the Helium network and Helium Mapper or Helium Cargo depending upon which you configured in step 6.

Using the Mapping Data

Now that your device is hopefully connecting to the Helium network refer to the following for more details about interpreting the mapping data.

• For the Helium Mapping effort visit here
• For the Helium Cargo effort visit here. Pay particular attention to the "Info" note found on this page.

T-BEAM Board Versions

Rev0

Rev1