Published March 30, 2021 © CC BY-NC-SA

ESP32 LoRa Sensor Monitoring with Embedded Web Server

Monitoring Sensors (Temperature, Humidity and Pressure) via LoRa radio using Arduino MKR WAN 1300 and TTGO ESP32 LoRa running Web Server

IntermediateFull instructions provided6 hours10,224

ESP32 LoRa Sensor Monitoring with Embedded Web Server

Things used in this project

Hardware components

Arduino MKR WAN 1300

LILYGO® TTGO LoRa32 T3 V1.6.1

DHT22 Temperature Sensor

Software apps and online services

Arduino IDE

Story

In this project, we’ve build a sensor monitoring system using a TTGO LoRa32 SX1276 OLED board that sends temperature, humidity and pressure readings via LoRa radio to two different receivers, one is TTGO ESP32 LoRa receiver1 and second is Arduino's MKR WAN 1300 LoRa Development Board. The receiver1 displays the latest sensor readings on a web server. Before starting implementation of the project let us see brief introduction about LoRa Technology.

What is LoRa ?

LoRa (short for Long Range) is a spread spectrum modulation technique derived from chirp spread spectrum (CSS) technology.

We have explained in detailed about LoRa Technology and its Features in following video, you can check that out

What is LoRa Technology ?

Functional Block Diagram of Project

LoRa Sender reads Sensors (BMP280 and DHT22) readings of (Temperature, Humidity and pressure), converts them in LoRa Packet format and send via LoRa radio every 10 seconds.
We’ve used two different types of receiver nodes - LoRa Receiver node 1 - with TTGO ESP32 and LoRa Receiver node 2 - Arduino MKR WAN 1300.
The LoRa Receiver node 1 has webserver deployed on it. It gets incoming LoRa packets and displays the received readings on an asynchronous web server also on OLED display. Besides the sensor readings, we also display the last time those readings were received and the RSSI (received signal strength indicator).
The LoRa Receiver node 2 is simple receiver node with Arduino MKR WAN 1300 board It gets incoming LoRa packets and displays the received readings on OLED display.

Hardware

We'll require following hardware components to assemble the circuitry

📜 Parts Required

1. Arduino LoRa MKR WAN1300

2. TTGO LoRa ESP32 OLED Development Boards – 2 Nos

3. BMP280 – Temperature and Atmospheric Pressure Sensor module

4. DHT22 - Temperature and Humidity Sensor

5. 0.96” OLED Display module

Schematics are given below or you can also go to our GitHub Repository

Software

To program the TTGO LoRa32 SX1276 OLED boards we’ll use Arduino IDE. We're going to deploy web sever on one of the receiver node i.e on Receiver Node 1 (TTGO LoRa32 Board).

To upload the web server files into the ESP32 filesystem, we’ll use the ESP32 filesystem uploader plugin.

So, before proceeding, you need to install the ESP32 package and the ESP32 filesystem uploader plugin in your Arduino IDE.

You can check out following videos for that, there we have explained in detail about how to install ESP boards into an Arduino IDE and how to install SPIFFS uploader plugin.

Installing Libraries

For this project you need to install several libraries.

==> LoRa, BMP280 and OLED Libraries

The following libraries can be installed through the Arduino Library Manager. Go to Sketch > Include Library> Manage Libraries and search for the library name.

LoRa library: arduino-LoRa library by sandeep mistry
OLED libraries: Adafruit_SSD1306 library and Adafruit_GFX library
BMP280 libraries: Adafruit_BMP280 library and Adafruit unified sensor library

==> Asynchronous Web Server Libraries

To build the asynchronous web server, you also need to install the following libraries:

These libraries are not available to install through the Library Manager. So, you need to unzip the libraries and move them to the Arduino IDE installation libraries folder.

Alternatively, you can go to Arduino IDE Sketch > Include Library > Add.ZIP library… and select the libraries you’ve just downloaded.

Code of the Project

Code of the project is given below, or you can also our GitHub Repo for code, schematics and libraries.

Demonstration

Check out following video where we have explained detailed working of this project, its block diagram, schematics and Implementation of web server. Finally you can also see the working demo of this project.

Code

// ------------------- blog.make2explore.com---------------------------------------------------------------//
// Project           - ESP32 LoRa Weather Station + Web Server
// Created By        - blog@make2explore.com
// Version - 1.1
// Software Platform - C/C++,HTML,CSS, Arduino IDE, Libraries
// Hardware Platform - TTGo LoRa ESP32 OLED v1, 0.96" OLED, Arduino MKRWAN 1300, BMP280 Sensor, DHT22 Sensor                
// Sensors Used      - BMP280 Atmospheric Pressure Sensor, DHT22 Temperature & Humidity Sensor
// Last Modified     - 31/03/2020 21:44:00
// -------------------------------------------------------------------------------------------------------//
// This is Sender Node Code - 

//Libraries for LoRa
#include <Wire.h>
#include <SPI.h>
#include <LoRa.h>

//Libraries for BMP280
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>

//Libraries for OLED Display
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

//Libraries for DHT22/11
#include <DHT.h>
#include <DHT_U.h>

//define the pins used by the LoRa transceiver module
#define SCK 5
#define MISO 19
#define MOSI 27
#define SS 18
#define RST 14
#define DIO0 26

//433E6 for Asia
//866E6 for Europe
//915E6 for North America
#define BAND 433E6

//OLED pins
#define OLED_RST 16
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Digital pin connected to the DHT sensor
#define DHTPIN 25
#define DHTTYPE DHT22  // Type DHT 22 (AM2302)

//global variables for temperature and Humidity
float Temperature = 0;
float Humidity = 0;
float Pressure = 0;

//initilize packet counter
int readingID = 0;
String LoRaMessage = "";

//define BMP instance
Adafruit_BMP280 bme; // I2C

////define OLED instance
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RST);

//define DHT instance
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;


//------------------Initialize OLED Module-------------------------------------------//
void initOLED()
{
  Serial.println("Initializing OLED Display");
  //reset OLED display via software
  
  //initialize OLED
  Wire.begin();

  //reset OLED display via software
  pinMode(OLED_RST, OUTPUT);
  digitalWrite(OLED_RST, LOW);
  delay(20);
  digitalWrite(OLED_RST, HIGH);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c, false, false)) { // Address 0x3C for 128x32
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  Serial.println("OLED Display OK!");
  
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("LoRa SENDER 1 - Pune");
  display.display();
}

//----------------------Initialize LoRa Module-----------------------------------------//
void initLoRa()
{
  Serial.println("LoRa Sender Test");
  //SPI LoRa pins
  SPI.begin(SCK, MISO, MOSI, SS);
  //setup LoRa transceiver module
  LoRa.setPins(SS, RST, DIO0);
  
  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
  Serial.println("LoRa Initializing OK!");
  display.setCursor(0,10);
  display.print("LoRa Initializing OK!");
  display.display();
  delay(2000);
}

//-------------------Initialize BMP280 Sensor-------------------------------------------//
void initBMP(){
  Serial.println(F("Initializing BMP280 Sensor"));
  if (!bme.begin(0x76)) {  
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }
  Serial.println(F("BMP280 is OK!"));
}

//--------------------Initialize DHT Sensor---------------------------------------------//
void initDHT()
{
  // Initialize DHT device.
  Serial.println(F("Initializing DHT Sensor"));
  dht.begin();
  Serial.println(F("DHT Sensor is OK!"));
}

//-----------------function for fetching DHT readings-----------------------------------//
void getDHTreadings()
{
  // Delay between measurements.
  delay(delayMS);
  // Get temperature event and print its value.
  sensors_event_t event;
  dht.temperature().getEvent(&event);
  if (isnan(event.temperature)) {
    Serial.println(F("Error reading temperature!"));
  }
  else {
    Serial.print(F("Temperature: "));
    Temperature=event.temperature;
    Serial.print(Temperature);
    Serial.println(F("°C"));
  }
  // Get humidity event and print its value.
  dht.humidity().getEvent(&event);
  if (isnan(event.relative_humidity)) {
    Serial.println(F("Error reading humidity!"));
  }
  else {
    Serial.print(F("Humidity: "));
    Humidity = event.relative_humidity;
    Serial.print(event.relative_humidity);
    Serial.println(F("%"));
  }
}

//-----------------function for fetching BMP280 readings--------------------------------//
void getBMPreadings()
{
 Pressure=bme.readPressure()/133;
 Serial.print(F("Pressure: "));
 Serial.print(Pressure);
 Serial.println(F(" mmHg"));
}


//-----------------function for fetching All  readings at once--------------------------//
void getReadings()
{
  getDHTreadings();
  getBMPreadings();
  delay(5000);
}

//-------------------------Display Readings on OLED-------------------------------------//
void displayReadings()
{
  display.clearDisplay();
  display.setCursor(0,0);
  display.print("LoRa SENDER 1 - Pune");
  display.setCursor(0,20);
  display.setTextSize(1);
  display.print("TEMPERATURE");
  display.setCursor(70,20);
  display.print(":");
  display.setCursor(80,20);
  display.print(Temperature);
  display.drawCircle(116,20,1, WHITE);
  display.setCursor(121,20);
  display.print("C");
  display.setCursor(0,37);
  display.print("HUMIDITY(%)");
  display.setCursor(70,37);
  display.print(":");
  display.setCursor(80,37);
  display.print(Humidity);
  display.setCursor(116,37);
  display.print("Rh");
  display.setCursor(0,55);
  display.print("PRESSURE");
  display.setCursor(50,55);
  display.print(":");
  display.setCursor(60,55);
  display.print(Pressure);
  display.setCursor(100,55);
  display.print("mmHg");
  display.display();
  Serial.print("Sending packet: ");
  Serial.println(readingID);
  readingID++;
}

//------------------Send data to receiver node using LoRa-------------------------//
void sendReadings() {
  LoRaMessage = String(readingID) + "/" + String(Temperature) + "&" + String(Humidity) + "#" + String(Pressure);
  //Send LoRa packet to receiver
  LoRa.beginPacket();
  LoRa.print(LoRaMessage);
  LoRa.endPacket();

  Serial.println("Packet Sent!");
  displayReadings();

  delay(10000);
}

void setup() 
{
  //initialize Serial Monitor
  Serial.begin(115200);
  initDHT();
  initBMP();
  initOLED();
  initLoRa();
}

void loop() {
  getReadings();
  sendReadings();
}

//============================ www.blog.make2explore.com ==============================//

// ------------------- blog.make2explore.com---------------------------------------------------------------//
// Project           - ESP32 LoRa Weather Station + Web Server
// Created By        - blog@make2explore.com
// Version - 1.0
// Software Platform - C/C++,HTML,CSS, Arduino IDE, Libraries
// Hardware Platform - TTGo LoRa ESP32 OLED v1, 0.96" OLED, Arduino MKRWAN 1300, BMP280 Sensor, DHT22 Sensor                
// Sensors Used      - BMP280 Atm Pressure Sensor, DHT22 Temperature Humidity Sensor
// Last Modified     - 31/03/2020 21:44:00
// -------------------------------------------------------------------------------------------------------//
// This is Receiver Node ESP32 LoRa Code - (WebServer)

// Import Wi-Fi library
#include <WiFi.h>
#include "ESPAsyncWebServer.h"

#include <SPIFFS.h>

//Libraries for LoRa
#include <SPI.h>
#include <LoRa.h>

//Libraries for OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// Libraries to get time from NTP Server
#include <NTPClient.h>
#include <WiFiUdp.h>

//define the pins used by the LoRa transceiver module
#define SCK 5
#define MISO 19
#define MOSI 27
#define SS 18
#define RST 14
#define DIO0 26

//433E6 for Asia
//866E6 for Europe
//915E6 for North America
#define BAND 433E6

//OLED pins
#define OLED_SDA 4
#define OLED_SCL 15 
#define OLED_RST 16
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Replace with your network credentials
const char* ssid     = "****";
const char* password = "****";

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);

// Variables to save date and time
String formattedDate;
String day;
String hour;
String timestamp;


// Initialize variables to get and save LoRa data
int rssi;
String loRaMessage;
String temperature;
String humidity;
String pressure;
String readingID;

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RST);

// Replaces placeholder with DHT values
String processor(const String& var){
  //Serial.println(var);
  if(var == "TEMPERATURE"){
    return temperature;
  }
  else if(var == "HUMIDITY"){
    return humidity;
  }
  else if(var == "PRESSURE"){
    return pressure;
  }
  else if(var == "TIMESTAMP"){
    return timestamp;
  }
  else if (var == "RRSI"){
    return String(rssi);
  }
  return String();
}

//------------------Initialize OLED Module-------------------------------------------//
void initOLED(){
  //reset OLED display via software
  pinMode(OLED_RST, OUTPUT);
  digitalWrite(OLED_RST, LOW);
  delay(20);
  digitalWrite(OLED_RST, HIGH);

  //initialize OLED
  Wire.begin(OLED_SDA, OLED_SCL);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c, false, false)) { // Address 0x3C for 128x32
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("LORA RECEIVER");
}

//----------------------Initialize LoRa Module-----------------------------------------//
void initLoRA(){
  int counter;
  //SPI LoRa pins
  SPI.begin(SCK, MISO, MOSI, SS);
  //setup LoRa transceiver module
  LoRa.setPins(SS, RST, DIO0);

  while (!LoRa.begin(BAND) && counter < 10) {
    Serial.print(".");
    counter++;
    delay(500);
  }
  if (counter == 10) {
    // Increment readingID on every new reading
    Serial.println("Starting LoRa failed!"); 
  }
  Serial.println("LoRa Initialization OK!");
  display.setCursor(0,10);
  display.clearDisplay();
  display.print("LoRa Initializing OK!");
  display.display();
  delay(2000);
}

//----------------------Connect to WiFi Function-----------------------------------------//
void connectWiFi(){
  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  display.setCursor(0,20);
  display.print("Access web server at: ");
  display.setCursor(0,30);
  display.print(WiFi.localIP());
  display.display();
}

//-----------------Read LoRa packet and get the sensor readings-----------------------//
void getLoRaData() {
  Serial.print("Lora packet received: ");
  // Read packet
  while (LoRa.available()) {
    String LoRaData = LoRa.readString();
    // LoRaData format: readingID/temperature&soilMoisture#batterylevel
    // String example: 1/27.43&654#95.34
    Serial.print(LoRaData); 
    
    // Get readingID, temperature and soil moisture
    int pos1 = LoRaData.indexOf('/');
    int pos2 = LoRaData.indexOf('&');
    int pos3 = LoRaData.indexOf('#');
    readingID = LoRaData.substring(0, pos1);
    temperature = LoRaData.substring(pos1 +1, pos2);
    humidity = LoRaData.substring(pos2+1, pos3);
    pressure = LoRaData.substring(pos3+1, LoRaData.length());    
  }
  // Get RSSI
  rssi = LoRa.packetRssi();
  Serial.print(" with RSSI ");    
  Serial.println(rssi);
}

//-----------------------Function to get date and time from NTPClient------------------//
void getTimeStamp() {
  while(!timeClient.update()) {
    timeClient.forceUpdate();
  }
  // The formattedDate comes with the following format:
  // 2018-05-28T16:00:13Z
  // We need to extract date and time
  formattedDate = timeClient.getFormattedDate();
  Serial.println(formattedDate);

  // Extract date
  int splitT = formattedDate.indexOf("T");
  day = formattedDate.substring(0, splitT);
  Serial.println(day);
  // Extract time
  hour = formattedDate.substring(splitT+1, formattedDate.length()-1);
  Serial.println(hour);
  timestamp = day + " " + hour;
}

//-------------------------Display Readings on OLED-------------------------------------//
void displayReadings()
{
  display.clearDisplay();
  display.setCursor(0,0);
  display.println("LoRa RECEIVER 1- Pune");
  display.setCursor(0,20);
  display.setTextSize(1);
  display.print("TEMPERATURE");
  display.setCursor(70,20);
  display.print(":");
  display.setCursor(80,20);
  display.print(temperature);
  display.drawCircle(116,20,1, WHITE);
  display.setCursor(121,20);
  display.print("C");
  display.setCursor(0,37);
  display.print("HUMIDITY(%)");
  display.setCursor(70,37);
  display.print(":");
  display.setCursor(80,37);
  display.print(humidity);
  display.setCursor(116,37);
  display.print("Rh");
  display.setCursor(0,55);
  display.print("PRESSURE");
  display.setCursor(50,55);
  display.print(":");
  display.setCursor(60,55);
  display.print(pressure);
  display.setCursor(100,55);
  display.print("mmHg");
  display.display();
  delay(1000);
}


void setup() { 
  // Initialize Serial Monitor
  Serial.begin(115200);
  initOLED();
  initLoRA();
  connectWiFi();
  
  if(!SPIFFS.begin()){
    Serial.println("An Error has occurred while mounting SPIFFS");
    return;
  }
  // Route for root / web page
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/index.html", String(), false, processor);
  });
  server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", temperature.c_str());
  });
  server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", humidity.c_str());
  });
  server.on("/pressure", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", pressure.c_str());
  });
  server.on("/timestamp", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", timestamp.c_str());
  });
  server.on("/rssi", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", String(rssi).c_str());
  });
  server.on("/background", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/background.jpg", "image/jpg");
  });
  // Start server
  server.begin();
  
  // Initialize a NTPClient to get time
  timeClient.begin();
  // Set offset time in seconds to adjust for your timezone, for example:
  // GMT +1 = 3600
  // GMT +8 = 28800
  // GMT -1 = -3600
  // GMT 0 = 0
  timeClient.setTimeOffset(19800);
}

void loop() {
  // Check if there are LoRa packets available
  int packetSize = LoRa.parsePacket();
  if (packetSize) {
    getLoRaData();
    displayReadings();
    getTimeStamp();
  }
}

//============================ www.blog.make2explore.com ==============================//

// ------------------- blog.make2explore.com---------------------------------------------------------------//
// Project           - ESP32 LoRa Weather Station + Web Server
// Created By        - blog@make2explore.com
// Version - 1.0
// Software Platform - C/C++,HTML,CSS, Arduino IDE, Libraries
// Hardware Platform - TTGo LoRa ESP32 OLED v1, 0.96" OLED, Arduino MKRWAN 1300, BMP280 Sensor, DHT22 Sensor                
// Sensors Used      - BMP280 Atm Pressure Sensor, DHT22 Temperature Humidity Sensor
// Last Modified     - 31/03/2020 21:44:00
// -------------------------------------------------------------------------------------------------------//
// This is Receiver Node Arduino MKR1300 WAN Code - 

//Libraries for LoRa WAN
#include <SPI.h>
#include <LoRa.h>

//Libraries for OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

//433E6 for Asia
//866E6 for Europe
//915E6 for North America
#define BAND 433E6


//OLED pins
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels


// Initialize variables to get and save LoRa data
int rssi;
String loRaMessage;
String temperature;
String humidity;
String pressure;
String readingID;

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


//------------------Initialize OLED Module-------------------------------------------//
void initOLED(){
  //initialize OLED
  Serial.println("Initializing OLED Module..");
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
 }
  Serial.println("OLED Initialization OK!");
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(20,0);
  display.print("LORA RECEIVER NODE");
  display.display(); 
}

//----------------------Initialize LoRa Module-----------------------------------------//
void initLoRA(){
  Serial.println("Initializing LoRa Module..");
  int counter;
  while (!LoRa.begin(BAND) && counter < 10) {
    Serial.print(".");
    counter++;
    delay(500);
  }
  if (counter == 10) {
    // Increment readingID on every new reading
    Serial.println("Starting LoRa failed!"); 
  }
  Serial.println("LoRa Initialization OK!");
  display.setCursor(0,20);
  display.clearDisplay();
  display.print("LoRa Initializing OK!");
  display.display();
  delay(2000);
}

//----------------------Initialize all modules-----------------------------------------//
void initialize_modules()
{
  Serial.println("Initializing Required Modules");
  initOLED();
  initLoRA();
  Serial.println("Initialization Done!!");
  delay(1000);
}

//-----------------Read LoRa packet and get the sensor readings-----------------------//
void getLoRaData() {
  Serial.print("Lora packet received: ");
  // Read packet
  while (LoRa.available()) {
    String LoRaData = LoRa.readString();
    // LoRaData format: readingID/temperature&soilMoisture#batterylevel
    // String example: 1/27.43&654#95.34
    Serial.println(LoRaData); 
    
    // Get readingID, temperature and soil moisture
    int pos1 = LoRaData.indexOf('/');
    int pos2 = LoRaData.indexOf('&');
    int pos3 = LoRaData.indexOf('#');
    readingID = LoRaData.substring(0, pos1);
    temperature = LoRaData.substring(pos1 +1, pos2);
    humidity = LoRaData.substring(pos2+1, pos3);
    pressure = LoRaData.substring(pos3+1, LoRaData.length());    
  }
  // Get RSSI
  rssi = LoRa.packetRssi();
  Serial.print(" with RSSI ");    
  Serial.println(rssi);
}

//-------------------------Display Readings on OLED-------------------------------------//
void displayReadings()
{
  display.clearDisplay();
  display.setCursor(0,0);
  display.println("LoRa RECEIVER 2 -Pune");
  display.setCursor(0,20);
  display.setTextSize(1);
  display.print("TEMPERATURE");
  display.setCursor(70,20);
  display.print(":");
  display.setCursor(80,20);
  display.print(temperature);
  display.drawCircle(116,20,1, WHITE);
  display.setCursor(121,20);
  display.print("C");
  display.setCursor(0,37);
  display.print("HUMIDITY(%)");
  display.setCursor(70,37);
  display.print(":");
  display.setCursor(80,37);
  display.print(humidity);
  display.setCursor(116,37);
  display.print("Rh");
  display.setCursor(0,55);
  display.print("PRESSURE");
  display.setCursor(50,55);
  display.print(":");
  display.setCursor(60,55);
  display.print(pressure);
  display.setCursor(100,55);
  display.print("mmHg");
  display.display();
  delay(1000);
}

void setup() {
  Serial.begin(115200);
  Serial.println("LoRa Receiver Node");
  initialize_modules();
  Serial.println("Ready To Receive Data");
}

void loop() {
  // Check if there are LoRa packets available
  int packetSize = LoRa.parsePacket();
  if (packetSize) {
    getLoRaData();
    displayReadings();
    delay(1000);
   }
}

//============================ www.blog.make2explore.com ==============================//

Credits

make2explore

8 projects • 15 followers

Engineering Consultant, Tech Content Creator - #Electronics #EmbeddedSystems #IoT #AI #ML

ESP32 LoRa Sensor Monitoring with Embedded Web Server

Things used in this project

Hardware components

Software apps and online services

Story

What is LoRa ?

Functional Block Diagram of Project

Hardware

Software

Demonstration

Schematics

ESP32 LoRa Sender

ESP32 LoRa Receiver - I

ESP32 LoRa Receiver - II

Code

ESP32 LoRa Sender Code

ESP32 LoRa Receiver Code

Arduino MKR WAN Receiver Code