Big ESP32 / SX127x topic part 1

End Devices (Nodes)
74

I have the Heltec esp32 LoRa 868MHz dev board.

#include <TheThingsNetwork.h>
#include <TheThingsMessage.h>

// Set your AppEUI and AppKey
const char *appEui = "XXXXXXXXXXXXXXX";
const char *appKey = "XXXXXXXXXXXXXXXXXXXXXXXX";

#define loraSerial Serial1
#define debugSerial Serial

// Replace REPLACE_ME with TTN_FP_EU868 or TTN_FP_US915
#define freqPlan TTN_FP_EU868

TheThingsNetwork ttn(loraSerial, debugSerial, freqPlan);

devicedata_t data = api_DeviceData_init_default;

#include <SPI.h>

#include <Wire.h>
#include "SSD1306.h"
#include "images.h"

// Pin definetion of WIFI LoRa 32
// HelTec AutoMation 2017 support@heltec.cn
#define SCK     5    // GPIO5  -- SX127x's SCK
#define MISO    19   // GPIO19 -- SX127x's MISO
#define MOSI    27   // GPIO27 -- SX127x's MOSI
#define SS      18   // GPIO18 -- SX127x's CS
#define RST     14   // GPIO14 -- SX127x's RESET
#define DI00    26   // GPIO26 -- SX127x's IRQ(Interrupt Request)

#define BAND    433E6  //you can set band here directly,e.g. 868E6,915E6
#define PABOOST true

unsigned int counter = 0;

SSD1306 display(0x3c, 4, 15);
String rssi = "RSSI --";
String packSize = "--";
String packet ;

void logo()
{
  display.clear();
  display.drawXbm(0, 5, logo_width, logo_height, logo_bits);
  display.display();
}

void setup()
{
  pinMode(16, OUTPUT);
  pinMode(25, OUTPUT);

  digitalWrite(16, LOW);    // set GPIO16 low to reset OLED
  delay(50);
  digitalWrite(16, HIGH); // while OLED is running, must set GPIO16 in high

  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
  logo();
  delay(1500);
  display.clear();

  SPI.begin(SCK, MISO, MOSI, SS);



  loraSerial.begin(57600);
  debugSerial.begin(9600);

  // Wait a maximum of 10s for Serial Monitor
  while (!debugSerial && millis() < 10000)
    ;

  debugSerial.println("-- STATUS");
  ttn.showStatus();

  debugSerial.println("-- JOIN");
  ttn.join(appEui, appKey);

  // Select what fields to include in the encoded message
  data.has_motion = true;
  data.has_water = false;
  data.has_temperature_celcius = true;
  data.has_temperature_fahrenheit = true;
  data.has_humidity = true;





  display.drawString(0, 0, "LoRa Initial success!");
  display.display();
  delay(1000);
}

void loop()
{
  display.clear();
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.setFont(ArialMT_Plain_10);

  display.drawString(0, 0, "Sending packet: ");
  display.drawString(90, 0, String(counter));
  display.display();


  debugSerial.println("-- LOOP");

  // Read the sensors
  data.motion = true;
  data.water = 682;
  data.temperature_celcius = 30;
  data.temperature_fahrenheit = 86;
  data.humidity = 97;

  // Encode the selected fields of the struct as bytes
  byte *buffer;
  size_t size;
  TheThingsMessage::encodeDeviceData(&data, &buffer, &size);

  ttn.sendBytes(buffer, size);



  counter++;
  digitalWrite(25, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(25, LOW);    // turn the LED off by making the voltage LOW
  
delay(5000);                       // wait for a second
}