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LoRaWan-Gateway Locator

This is an illustration of building a Coverage Measurement Equipment out of standard Arduino parts

The main problem was the "common" usage of pin-10 as ChipSelect (SS*) on the SPI bus.

This interferred between the Dragino board and the SD-Card.

Also to be changed had the Rx/Tx from the Adafruit GPS-Logger board from 7/8 to 4/5 not conflicting with the Dragino pins.

The LMIC 1.5 library used for this project uses itself 30kB of storage, nearly the full memory an UNO offers.

So I use a piggypack board, replacing the 328P-28DIL with a ATmega1284 which has 4 times the memory that an UNO has.

BOM:

Adafruit Ultimate GPS Logger Shield https://learn.adafruit.com/adafruit-ultimate-gps-logger-shield?view=all

Arduino UNO with 328P in DIL28 socket package!

HobbyTronics UNO*Pro http://www.hobbytronics.co.uk/arduino-uno-pro?keyword=uno%20pro

Dragino board Version 1.3 with RFM95W (marked as RFM96!) LoRaWan compatible radio

#Modifications:

all of them are made on the Adafruit GPS shield (see picture Mod_1)

  1. cut at the TOP side the traces Tx, Rx & CCS
  2. connect CCS -> 8, Tx -> 5, Rx -> 4
  3. in the software use in the definitions
    #define SD_Select      8
    #define Drag_Select   10
    SoftwareSerial mySerial(5, 4);  // switch in position SW serial!
    Adafruit_GPS GPS(&mySerial);
   // Pin mapping  for Dragino Board Version 1.3
    const lmic_pinmap lmic_pins = {
    .nss = 10,
    .rxtx = LMIC_UNUSED_PIN,
    .rst = 9,
    .dio = {2, 6, 7},
    };

in setup() you have to configure the two different ChipSelect

    pinMode(SD_Select, OUTPUT);       digitalWrite(SD_Select, HIGH);  // DEselect 
    pinMode(Drag_Select, OUTPUT);  digitalWrite(Drag_Select, HIGH);   // DEselect

when writing to the SD card make shure that the Dragino is disabled

    digitalWrite(Drag_Select, HIGH);       // disable Dragino_Board_ChipSelect
    log_on_SD();                           // write a log to the SDcard
    digitalWrite(SD_Select, HIGH);         // disable SDcard_ChipSelect