Problems with GROVE LORA 868mhz module. Please help!

Products & Technology Grove
#1

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() {
  ss.begin(9600);
  Serial.begin(9600);
}

void loop() {
  while(Serial.available() > 0){
    ss.write(Serial.read());
  }
  while(ss.available() > 0){
    Serial.write(ss.read());
  }
}
#2

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

#3

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.begin(115200);
    Serial.println("RF95 server test.");
    
    pinMode(led, OUTPUT); 
    
    while(!rf95.init())
    {
        Serial.println("init failed");
        delay(100);
    } 
    // 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);
    
    rf95.setFrequency(868.0);
}

void loop()
{
  if(rf95.available())
  {
    // 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: ");
        Serial.println((char*)buf);
        
        // Send a reply
        uint8_t data[] = "And hello back to you";
        rf95.send(data, sizeof(data));
        rf95.waitPacketSent();
        Serial.println("Sent a reply");
        
        digitalWrite(led, LOW);
    }
    else
    {
        Serial.println("recv failed");
    }
  }
}