Problems with GROVE LORA 868mhz module. Please help!

Hi everyone,

I’m trying to use two Grove Lora 868MHZ modules to communicate between two Arduino boards (link to product), but nothing seems to work.

Indeed, I tried sending single AT commands (es: “AT\r\n” and “AT”) via Serial communication, but I got no response.

Can anybody please help? It’s urgent.

My connections (module to arduino):

  • VCC to 3.3V

  • GND to GND

  • TX to pin5

  • RX to pin6

The code I’m using to send AT commands is:

include <SoftwareSerial.h>

SoftwareSerial ss(5,6);

void setup() {

void loop() {
  while(Serial.available() > 0){
  while(ss.available() > 0){

I also tried the example from the libraries, but nothing seems to work. I just get the famous “init failed” error message

The code I also used for testing. I get “init failed” error message:

#include <RHRouter.h>
#include <RadioHead.h>
#include <RHUartDriver.h>
#include <RHDatagram.h>
#include <RHMesh.h>
#include <RHGenericDriver.h>
#include <RH_RF95.h>
#include <RHReliableDatagram.h>

// rf95_server.pde
// -*- mode: C++ -*-
// Example sketch showing how to create a simple messageing server
// with the RH_RF95 class. RH_RF95 class does not provide for addressing or
// reliability, so you should only use RH_RF95  if you do not need the higher
// level messaging abilities.
// It is designed to work with the other example rf95_client
// Tested with Anarduino MiniWirelessLoRa

#include <SoftwareSerial.h>

// Singleton instance of the radio driver
SoftwareSerial ss(5, 6);
RH_RF95 rf95(ss);

int led = 13;

void setup() 
    Serial.println("RF95 server test.");
    pinMode(led, OUTPUT); 
        Serial.println("init failed");
    // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on

    // The default transmitter power is 13dBm, using PA_BOOST.
    // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then 
    // you can set transmitter powers from 5 to 23 dBm:
    //rf95.setTxPower(13, false);

void loop()
    // Should be a message for us now   
    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    if(rf95.recv(buf, &len))
        digitalWrite(led, HIGH);
        Serial.print("got request: ");
        // Send a reply
        uint8_t data[] = "And hello back to you";
        rf95.send(data, sizeof(data));
        Serial.println("Sent a reply");
        digitalWrite(led, LOW);
        Serial.println("recv failed");