Code for Lilygo TTGO Lora32 ESP Module as a receiver

[martin3000]

/*********
Rui Santos
Complete project details at https://RandomNerdTutorials.com/ttgo-lora32-sx1276-arduino-ide/
needs LoRa library be sandeep mistry

lora32-receiver
https://github.com/sandeepmistry/arduino-LoRa/blob/master/API.md
https://github.com/sandeepmistry/arduino-LoRa
*********/

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

//Libraries for OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.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 866E6

//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

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

String LoRaData;

void setup() {
//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 ");
display.display();

//initialize Serial Monitor
Serial.begin(115200);

//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);
}
LoRa.setSpreadingFactor(9 /SF9/);

//Serial.println("LoRa Initializing OK!");
display.setCursor(0,10);
display.println("LoRa Initializing OK!");
display.display();
}

void loop() {

//try to parse packet
int packetSize = LoRa.parsePacket();

if (packetSize) {
//received a packet
Serial.println("Received packet: ");

LoRaData = "";

while (LoRa.available()) {
  LoRaData += (char)LoRa.read();
}

Serial.println("Message: " + LoRaData);
Serial.println("RSSI: " + String(LoRa.packetRssi()));
Serial.println("Snr: " + String(LoRa.packetSnr()));
Serial.println();

// Dsiplay information
display.clearDisplay();
display.setCursor(0,0);
display.print("LORA RECEIVER");
display.setCursor(0,20);
display.print("Received packet:");
display.setCursor(0,30);
display.print(LoRaData);
display.setCursor(0,40);
display.print("RSSI:");
display.setCursor(30,40);
display.print(LoRa.packetRssi());
display.display();   

}
}