Heltec Lora32 Wifi + BME POC

lora32_bme_oled.ino

#include <SPI.h>
#include <LoRa.h>
#include "SSD1306.h"
#include<Arduino.h>
#include "Adafruit_BME280.h" // from https://github.com/Takatsuki0204/BME280-I2C-ESP32

#define I2C_SDA 4
#define I2C_SCL 15
#define SEALEVELPRESSURE_HPA (1013.25)
#define BME280_ADD 0x76

Adafruit_BME280 bme(I2C_SDA, I2C_SCL);

//OLED pins to ESP32 GPIOs via this connecthin:
//OLED_SDA -- GPIO4
//OLED_SCL -- GPIO15
//OLED_RST -- GPIO16

SSD1306  display(0x3c, 4, 15);


// WIFI_LoRa_32 ports

// GPIO5  -- SX1278's SCK
// GPIO19 -- SX1278's MISO
// GPIO27 -- SX1278's MOSI
// GPIO18 -- SX1278's CS
// GPIO14 -- SX1278's RESET
// GPIO26 -- SX1278's IRQ(Interrupt Request)

#define SS      18
#define RST     14
#define DI0     26
#define BAND    433E6  //915E6 

int counter = 0;

void I2Cscan() {

  byte error;
  byte address;
  int numberOfDevices = 0;
  String addressMessage = "";

  Serial.println("Scanning...\n");

  for (address = 1; address < 127; address++) {

    // The i2c_scanner uses the return value of
    // Write.endTransmisstion to see if
    // a device acknowledged at that address.

    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (0 == error) {
      addressMessage = "I2C device found at address 0x";
      if (address < 16) {
        addressMessage += "0";
      }
      addressMessage += String(address);
      addressMessage += "!";
      Serial.printf("%s\n", addressMessage.c_str());
      Serial.println();

      numberOfDevices++;
    } else if (4 == error) {
      addressMessage = "Unknown error at address 0x";
      if (address < 16) {
        addressMessage += "0";
      }
      addressMessage += String(address);
      Serial.printf("%s\n", addressMessage.c_str());
      Serial.println();
    } // if (0 == error)
  } // for (address = 1...)

  if (0 == numberOfDevices)
    Serial.println("No I2C devices found.\n");
  else
    Serial.println("Done\n");
}


void getValues() {
  Serial.print("Temperature = ");
  Serial.print(bme.readTemperature());
  Serial.println(" ℃");

  Serial.print("Pressure = ");

  Serial.print(bme.readPressure() / 100.0F);
  Serial.println(" hPa");

  Serial.print("Approx. Altitude = ");
  Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
  Serial.println(" m");

  Serial.print("Humidity = ");
  Serial.print(bme.readHumidity());
  Serial.println(" %");

  Serial.println();
}

void setup() {
  pinMode(25,OUTPUT); //Send success, LED will bright 1 second
  
  pinMode(16,OUTPUT);
  digitalWrite(16, LOW);    // set GPIO16 low to reset OLED
  delay(50); 
  digitalWrite(16, HIGH);
  
  Serial.begin(115200);
  while (!Serial); //If just the the basic function, must connect to a computer
 
  // Initialising the UI will init the display too.
  display.init();

  I2Cscan();
  
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.drawString(5,5,"LoRa Sender");
  display.display();
  
  SPI.begin(5,19,27,18);
  LoRa.setPins(SS,RST,DI0);
  Serial.println("LoRa Sender");
  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
  Serial.println("LoRa Initial OK!");
  display.drawString(5,20,"LoRa Initializing OK!");
  display.display();
  delay(2000);

  bool status;

  status = bme.begin(BME280_ADD);
  if (!status) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    //while (1);
  }
  
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);
  
  display.clear();
  display.setFont(ArialMT_Plain_16);
  display.drawString(3, 5, "Sending packet ");
  display.drawString(50, 30, String(counter));
  display.display();

  // send packet
  LoRa.beginPacket();
  LoRa.print("Hello..");
  LoRa.print(counter);
  LoRa.endPacket();
  
  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(1000);                       // wait for a second
  
  delay(3000);
  getValues();
}