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Code to make experiment on TTN Mapper with GPS and TTGO
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README.md

esp32-ttnmapper-gps

Program to make a LoRaWAN node based on the TTGO LoRa 915MHz plus GPS (ATGM336H). The code is configured to connect to The Things Network using US frequency and send the gps values to the ttnmapper

travis license

ttn

Hardware

  • TTGO LORA32 915Mhz (Heltec Wifi LoRa 32)
  • GPS ATGM336H

Images

ttgogps ttnttn

Schematic

ESP32 GPS
5V VCC
GND GND
34 TX
33 RX

Librarys

The Things Network

Application Configuration

First it's a good idea to create a new application, them go on Payload Formats and put the code below.

payload

function Decoder(bytes, port) {
  // Decode an uplink message from a buffer
  // (array) of bytes to an object of fields.
  var decoded = {};
  // if (port === 1) decoded.led = bytes[0];
  decoded.lat = ((bytes[0]<<16)>>>0) + ((bytes[1]<<8)>>>0) + bytes[2];
  decoded.lat = (decoded.lat / 16777215.0 * 180) - 90;
  decoded.lon = ((bytes[3]<<16)>>>0) + ((bytes[4]<<8)>>>0) + bytes[5];
  decoded.lon = (decoded.lon / 16777215.0 * 360) - 180;
  var altValue = ((bytes[6]<<8)>>>0) + bytes[7];
  var sign = bytes[6] & (1 << 7);
  if(sign)
  {
    decoded.alt = 0xFFFF0000 | altValue;
  }
  else
  {
    decoded.alt = altValue;
  }
  decoded.hdop = bytes[8] / 10.0;
  return decoded;
}

Next go on integration and add a integration TNN Mapper. (It's a good idea to add a experiment name)

integration

With the experiment name is possible to check only the experiment criciuma. More information on the TTN Mapper Documentation.

Node

Create a new device and goes to setting, change the Activation Method to ABP and disable the Frame Counter Check, them save.

abp

Next goes to Overview on the bottow Example Code.

node

Copy the code and replace on the sample code (esp32-ttnmapper-gps.ino).

If your board is diferent from the Heltec Wifi LoRa 32 you should check the pins connection on lmic_pins.


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