B4R Question RadioHead RF95 Lora Library

Carlengue · Oct 3, 2017

Hi Erel,

First give thanks for these great programs that make it possible to program in an easy and intuitive way almost all the devices.

I would like to ask if it is possible to make an arduino library for the Lora Modules

I think one of the best libraries is the RadioHead and the RF95 module that supports almost all the LORA radios on the market like Semtech SX1276 / 77/78/79, which are the most used.

http://www.airspayce.com/mikem/arduino/RadioHead/
http://www.airspayce.com/mikem/arduino/RadioHead/classRH__RF95.html

I have several modules of them in different frequencies: 915 mhz and 433 mhz

http://www.dragino.com/products/module/item/102-lora-shield.html

Thank you very much

Erel · Oct 4, 2017

Interesting. Have you ran any Arduino example based on this library? Can you post it?

Carlengue · Oct 4, 2017

You can download all the documentation, libraries and examples of all radio modules that supports from:

http://www.airspayce.com/mikem/arduino/RadioHead/RadioHead-1.80.zip

Supports a huge amount of radio modules like these:

RH_RF22 Works with Hope-RF RF22B and RF23B based transceivers
RH_RF24 Works with Silicon Labs Si4460/4461/4463/4464
RH_RF69 Works with Hope-RF RF69B based radio modules, such as the RFM69 module
RH_NRF24 Works with Nordic nRF24 based 2.4GHz radio modules, such as nRF24L01
RH_NRF905 Works with Nordic nRF905 based 433/868/915 MHz radio modules.
RH_NRF51 Works with Nordic nRF51 compatible 2.4 GHz SoC/devices such as the nRF51822
RH_RF95 Works with Semtech SX1276/77/78/79, Modtronix inAir4 and inAir9, and HopeRF RFM95/96/97/98 and other similar LoRa capable radios
RH_MRF89 Works with Microchip MRF89XA and compatible transceivers. and modules such as MRF89XAM9A.
RH_CC110 Works with Texas Instruments CC110L transceivers and compatible modules
RH_E32 Works with EBYTE E32-TTL-1W serial radio transceivers
RH_ASK Works with a range of inexpensive ASK (amplitude shift keying) RF transceivers such as RX-B1
RH_Serial Works with RS232, RS422, RS485, RS488 and other point-to-point and multidropped serial connections, or with TTL serial UARTs such as those on Arduino and many other processors, or with data radios with a serial port interface. RH_Serial provides packetization and error detection over any hardware or virtual serial connection. Also builds and runs on Linux and OSX.

A simple Server code:

B4X:

// 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, Rocket Scream Mini Ultra Pro with
// the RFM95W, Adafruit Feather M0 with RFM95

#include <SPI.h>
#include <RH_RF95.h>

// Singleton instance of the radio driver
RH_RF95 rf95;
//RH_RF95 rf95(5, 2); // Rocket Scream Mini Ultra Pro with the RFM95W
//RH_RF95 rf95(8, 3); // Adafruit Feather M0 with RFM95

// Need this on Arduino Zero with SerialUSB port (eg RocketScream Mini Ultra Pro)
//#define Serial SerialUSB

int led = 9;

void setup()
{
  // Rocket Scream Mini Ultra Pro with the RFM95W only:
  // Ensure serial flash is not interfering with radio communication on SPI bus
//  pinMode(4, OUTPUT);
//  digitalWrite(4, HIGH);

  pinMode(led, OUTPUT);   
  Serial.begin(9600);
  while (!Serial) ; // Wait for serial port to be available
  if (!rf95.init())
    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:
//  driver.setTxPower(23, false);
  // If you are using Modtronix inAir4 or inAir9,or any other module which uses the
  // transmitter RFO pins and not the PA_BOOST pins
  // then you can configure the power transmitter power for -1 to 14 dBm and with useRFO true.
  // Failure to do that will result in extremely low transmit powers.
//  driver.setTxPower(14, true);
}

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);
//      RH_RF95::printBuffer("request: ", buf, len);
      Serial.print("got request: ");
      Serial.println((char*)buf);
//      Serial.print("RSSI: ");
//      Serial.println(rf95.lastRssi(), DEC);
    
      // 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");
    }
  }
}

And a simple Client Code:

B4X:

// rf95_client.pde
// -*- mode: C++ -*-
// Example sketch showing how to create a simple messageing client
// 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_server
// Tested with Anarduino MiniWirelessLoRa, Rocket Scream Mini Ultra Pro with
// the RFM95W, Adafruit Feather M0 with RFM95

#include <SPI.h>
#include <RH_RF95.h>

// Singleton instance of the radio driver
RH_RF95 rf95;
//RH_RF95 rf95(5, 2); // Rocket Scream Mini Ultra Pro with the RFM95W
//RH_RF95 rf95(8, 3); // Adafruit Feather M0 with RFM95

// Need this on Arduino Zero with SerialUSB port (eg RocketScream Mini Ultra Pro)
//#define Serial SerialUSB

void setup()
{
  // Rocket Scream Mini Ultra Pro with the RFM95W only:
  // Ensure serial flash is not interfering with radio communication on SPI bus
//  pinMode(4, OUTPUT);
//  digitalWrite(4, HIGH);

  Serial.begin(9600);
  while (!Serial) ; // Wait for serial port to be available
  if (!rf95.init())
    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:
//  driver.setTxPower(23, false);
  // If you are using Modtronix inAir4 or inAir9,or any other module which uses the
  // transmitter RFO pins and not the PA_BOOST pins
  // then you can configure the power transmitter power for -1 to 14 dBm and with useRFO true.
  // Failure to do that will result in extremely low transmit powers.
//  driver.setTxPower(14, true);
}

void loop()
{
  Serial.println("Sending to rf95_server");
  // Send a message to rf95_server
  uint8_t data[] = "Hello World!";
  rf95.send(data, sizeof(data));
 
  rf95.waitPacketSent();
  // Now wait for a reply
  uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
  uint8_t len = sizeof(buf);

  if (rf95.waitAvailableTimeout(3000))
  {
    // Should be a reply message for us now  
    if (rf95.recv(buf, &len))
   {
      Serial.print("got reply: ");
      Serial.println((char*)buf);
//      Serial.print("RSSI: ");
//      Serial.println(rf95.lastRssi(), DEC);   
    }
    else
    {
      Serial.println("recv failed");
    }
  }
  else
  {
    Serial.println("No reply, is rf95_server running?");
  }
  delay(400);
}

Erel · Oct 5, 2017

Do you have the hardware to test it? Does it work?

Carlengue · Oct 5, 2017

Of course. I have four modules of 433 mhz and two of 915 mhz. I've tried that library with the Arduino IDE and it works perfectly.

This is the shieldd I have.

http://www.dragino.com/products/module/item/102-lora-shield.html

Erel · Oct 8, 2017

I will try to wrap it (it will take some time).

Carlengue · Oct 8, 2017

Thanks Erel.

Erel · Oct 22, 2017

I've ordered two LoRA shields. I will write the library when they arrive.

It will be much simpler for me to develop it with the hardware.

Carlengue · Oct 22, 2017

Erel said:
I've ordered two LoRA shields. I will write the library when they arrive.

It will be much simpler for me to develop it with the hardware.

Perfect. I think it's the best option. Thanks again.

Erel · Dec 3, 2017

https://www.b4x.com/android/forum/threads/rradiohead-rf95-dragino-lora-shield.86819/

B4R Question RadioHead RF95 Lora Library

Carlengue

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Erel

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Carlengue

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Erel

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Carlengue

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Erel

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Carlengue

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Erel

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Carlengue

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Erel

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