Ra-02 LoRa

// Ra-02 LoRa on Arduino Uno: wiring and a free simulation at https://www.tinkered.ai/components/sx1278-ra-02
// Ra-02 (SX1278, 433 MHz) on an Arduino Uno via a level shifter: NSS D10, RESET D9, DIO0 D2
// Flash one board with isSender = true and another with isSender = false.
#include <SPI.h>
#include <LoRa.h>

const int PIN_NSS = 10;
const int PIN_RESET = 9;
const int PIN_DIO0 = 2;
const bool isSender = true;
unsigned long counter = 0;

void setup() {
  Serial.begin(115200);
  LoRa.setPins(PIN_NSS, PIN_RESET, PIN_DIO0);
  LoRa.setSPIFrequency(1E6); // slow enough for a BSS138 level shifter
  if (!LoRa.begin(433E6)) {
    Serial.println(F("Ra-02 not found: check wiring, level shifter and 3.3 V supply"));
    while (true) {}
  }
  LoRa.setSpreadingFactor(9); // 7 to 12: higher reaches further, sends slower
  LoRa.setSyncWord(0x34);     // private network word, same on both ends
  Serial.println(isSender ? F("LoRa sender ready") : F("LoRa receiver ready"));
}

void loop() {
  if (isSender) {
    LoRa.beginPacket();
    LoRa.print("hello ");
    LoRa.print(counter);
    LoRa.endPacket();
    Serial.print(F("Sent packet "));
    Serial.println(counter++);
    delay(5000);
  } else {
    int size = LoRa.parsePacket();
    if (size > 0) {
      Serial.print(F("Received '"));
      while (LoRa.available()) Serial.print((char)LoRa.read());
      Serial.print(F("' RSSI "));
      Serial.print(LoRa.packetRssi());
      Serial.print(F(" dBm, SNR "));
      Serial.println(LoRa.packetSnr());
    }
  }
}

// Ra-02 LoRa on ESP32 DevKit V1: wiring and a free simulation at https://www.tinkered.ai/components/sx1278-ra-02
// Ra-02 (SX1278, 433 MHz) on an ESP32 DevKit V1: NSS GPIO5, RESET GPIO27, DIO0 GPIO26, VSPI 18/19/23
// Flash one board with isSender = true and another with isSender = false.
#include <SPI.h>
#include <LoRa.h>

const int PIN_NSS = 5;
const int PIN_RESET = 27;
const int PIN_DIO0 = 26;
const bool isSender = true;
unsigned long counter = 0;

void setup() {
  Serial.begin(115200);
  LoRa.setPins(PIN_NSS, PIN_RESET, PIN_DIO0);
  if (!LoRa.begin(433E6)) {
    Serial.println("Ra-02 not found: check wiring and the 3.3 V supply");
    while (true) { delay(100); }
  }
  LoRa.setSpreadingFactor(9);
  LoRa.setSyncWord(0x34);
  Serial.println(isSender ? "LoRa sender ready" : "LoRa receiver ready");
}

void loop() {
  if (isSender) {
    LoRa.beginPacket();
    LoRa.print("hello ");
    LoRa.print(counter);
    LoRa.endPacket();
    Serial.printf("Sent packet %lu\n", counter++);
    delay(5000);
  } else {
    int size = LoRa.parsePacket();
    if (size > 0) {
      String text;
      while (LoRa.available()) text += (char)LoRa.read();
      Serial.printf("Received '%s' RSSI %d dBm, SNR %.1f dB\n", text.c_str(), LoRa.packetRssi(), LoRa.packetSnr());
    }
  }
}

// Ra-02 LoRa on Raspberry Pi Pico: wiring and a free simulation at https://www.tinkered.ai/components/sx1278-ra-02
// Ra-02 (SX1278, 433 MHz) on a Raspberry Pi Pico (arduino-pico): NSS GP17, RESET GP20, DIO0 GP21, SPI0 GP16/18/19
// Flash one board with isSender = true and another with isSender = false.
#include <SPI.h>
#include <LoRa.h>

const int PIN_NSS = 17;
const int PIN_RESET = 20;
const int PIN_DIO0 = 21;
const bool isSender = true;
unsigned long counter = 0;

void setup() {
  Serial.begin(115200);
  SPI.setRX(16);
  SPI.setSCK(18);
  SPI.setTX(19);
  LoRa.setPins(PIN_NSS, PIN_RESET, PIN_DIO0);
  if (!LoRa.begin(433E6)) {
    Serial.println("Ra-02 not found: check wiring and the 3.3 V supply");
    while (true) { delay(100); }
  }
  LoRa.setSpreadingFactor(9);
  LoRa.setSyncWord(0x34);
  Serial.println(isSender ? "LoRa sender ready" : "LoRa receiver ready");
}

void loop() {
  if (isSender) {
    LoRa.beginPacket();
    LoRa.print("hello ");
    LoRa.print(counter);
    LoRa.endPacket();
    Serial.print("Sent packet ");
    Serial.println(counter++);
    delay(5000);
  } else {
    int size = LoRa.parsePacket();
    if (size > 0) {
      Serial.print("Received '");
      while (LoRa.available()) Serial.print((char)LoRa.read());
      Serial.print("' RSSI ");
      Serial.print(LoRa.packetRssi());
      Serial.print(" dBm, SNR ");
      Serial.println(LoRa.packetSnr());
    }
  }
}