arduino-LoRa

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Hi,

I am using SX1278 chip from AI-Thinker (433 MHz) with Arduino board to get the temperature and humidity data but I am getting "Starting LoRa failed". I made the changes as mentioned in this thread (for LoRa.cpp and setPins as well) but struggling to debug the issue. Can somebody please help me out here as it is really crucial for me to make it run. The connections and the codes are as follows:

The transmitter code:

#include <SPI.h>

#include <LoRa.h>

#include "DHT.h"

#define DHTPIN A0 // what pin we're connected to

#define DHTTYPE DHT11 // DHT 11 #define LORA_SS 10 #define LORA_RST 9 #define LORA_DIO0 2 DHT dht(DHTPIN, DHTTYPE);

int hum;

float temp; //Stores temperature value

int counter = 0;

void setup() {
pinMode(LORA_SS, OUTPUT); digitalWrite(LORA_SS, HIGH);

LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0); LoRa.setSPIFrequency(1E6);

Serial.begin(9600);

dht.begin();

while (!Serial);

Serial.println("LoRa Sender");

if (!LoRa.begin(433E6)) {

Serial.println("Starting LoRa failed!");

while (1);

}

}

void loop() {

temp = dht.readTemperature();

hum = dht.readHumidity();

Serial.print("Sending packet: ");

Serial.println(counter);

// send packet

LoRa.beginPacket();

LoRa.print("Humidity: ");

LoRa.print(hum);

LoRa.print("c");

LoRa.print("Temperature:");

LoRa.print(temp);

LoRa.endPacket();

counter++;

delay(5000);

}

The receiver code:

#include <SPI.h>

#include <LoRa.h>

#include <LiquidCrystal.h>

#define LORA_SS 10 #define LORA_RST 9 #define LORA_DIO0 2

const int rs = 8, en = 7, d4 = 6, d5 = 5, d6 = 4, d7 = 3; //Mention the pin number for LCD connection

LiquidCrystal lcd(rs, en, d4, d5, d6, d7);//Initialize LCD method

void setup() {

pinMode(LORA_SS, OUTPUT);

digitalWrite(LORA_SS, HIGH);

LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0); LoRa.setSPIFrequency(1E6);

Serial.begin(9600);

lcd.begin(16, 2);

while (!Serial);

Serial.println("LoRa Receiver");

if (!LoRa.begin(433E6)) {

Serial.println("Starting LoRa failed!");

while (1);

}

}

void loop() {

// try to parse packet

int packetSize = LoRa.parsePacket();

if (packetSize) {

// received a paket

Serial.print("Received packet '");

// read packet

while (LoRa.available()) {

  char incoming = (char)LoRa.read();

  if (incoming == 'c')

  {

    lcd.setCursor(0, 1);

  }

  else

  {

    lcd.print(incoming);

  }

}

} }

The connections are as follows:

@sandeepmistry Please help me out.

Thanks, Suraj

Please format the code properly (add 4 spaces before every line, or surround the code with 3 backticks ` before the first line and after the last line; also you don't need to skip a line every line...), as it is now unreadable... If you're getting a starting failed error, the init code is wrong.

First thing, remove these 2 lines, you have no business messing with the LoRa pins:

  pinMode(LORA_SS, OUTPUT);
  digitalWrite(LORA_SS, HIGH);

Next, reorder your code: one line you do LoRa, then Serial, then LCD, then Serial, then LoRa. Group your code by item:

void setup() {
  Serial.begin(9600);
  while (!Serial);
  lcd.begin(16, 2);
  Serial.println("LoRa Receiver");
  LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0);
  LoRa.setSPIFrequency(1E6);
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}

If this still doesn't work, you might want to look into setSPIFrequency: maybe change the frequency, or, leave it alone altogether.

@Kongduino Thanks very much for your reply. Actually I tried all the things you mentioned but it's still says the same. I was wondering if I can use 433 MHz freq in Europe. As far as I know, it is valid but still my hardware is not working. Also, I used setPins as it was mentioned on the forum if anyone receives "Starting LoRa failed".

Can you please help me out debugging this?

Thanks

Remove the LCD code and use standard example code first.

If still hitting error, either wrong pin mapping or not enough power to LoRa.

For less likely issue, you may need to convert logic level to 3.3v for LoRa.

@IoTThinks Thanks for your reply. Yeah I think there isn't enough power to LoRa. I'll see if an external 3.3V power supply works out or not.

433 is not an issue – at least not a technical one. I am not sure whether it is legal everywhere in the EU but considering most cars/gates remote controls are 433...

As @IoTThinks said, it could be that the LCD is the issue. Remove everything: just the board and LoRa. Also, I am not sure the Ra-01/Ra-02 is 5v tolerant. It's usually rated for 3.3~3.7v. You might've fried it. Do you have a 3.3v board (and a new Ra-0x chip)? Or you could get a bidirectional logic level converter and make sure you protect the LoRa chip.

hello, I'm tried to test lora module. Where,on the transmitter side i use arduino uno and lora ra-02. On the receiver side, i use arduino nano and lora ra-02. I'm having issues on the transmitter side which it keep on showing starting lora failed. Please help me.

@ASHJAY97 If you were me, would you know what I did with my boards, my source code and wiring?

So in order to help, you have to take your effort to show your physical boards (to avoid misktakes using wrong boards), your source code (to confirm it is not your coding bugs) and your real wiring (to confirm the wiring is correct).

You must use example codes in this library first.

@Kongduino AIThinker ra01/02 is same as RFM95. But they use 433Mhz instead.

They still use 3.3v logic unless the board is modified.

@IoTThinks I know, I have a few :-) I was being slightly rhetorical. I believe the chip is fried at this point. A sustained application of good ole 5v probably did nothing good to it.

My ra01/02 can run well with Arduino Mega with 5v logic directly for a short time only. By right, it is not good.

Most of the time, I use rfm95/ra01/ra02 with esp32 (3.3v logic).

@sandeepmistry Please do not close this issue yet. I am still working on to resolve the issue.

@surajgawade30 Did you just connect UNO to SX1278 directly?

If yes, i think maybe that was the problem is

Because, so far i know that LoRa operating voltage is 3V3 which most off all Arduino (UNO, NANO, MEGA) have 5V operating voltage that maybe can burn your LoRa Board.

So, i highly recommend you have to use 3V3 board operating voltage such as ESP32, STM32, etc.

I'm having the same problem, but I'm using a esp32 pico with a LoRa embbed to it. The comercial version is: LillyGo TTGO LoRa32 V1.6.1. It was running perfectly, but since my last try it's just doesn't work anymore. And my code is:

#include <SPI.h>
#include <LoRa.h>

/*
IMPORTS / INCLUDES
__________
SPI.h   = Interface Serial de Periféricos, permite a comunicação entre
o microcontrolador e outros dipostivos via Serial Port (USB COM do computador)
LoRa.h  = Biblioteca de configurações de firmware para o uso do protocolo de
comunicação LoRa. Configuração de pinagens das placas estão neste documento.

*/

// inicia um contador inteiro iguala a 0
int counter = 0;

// Configuração da inicialização da comunicação LoRa Transmissora
void setup()
{
  Serial.begin(9600);
  while (!Serial);

  Serial.println("LoRa Sender");

  if (!LoRa.begin(868E6))
  {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}

void loop()
{
  Serial.print("Sending packet: ");
  Serial.println(counter);

  // send packet
  LoRa.beginPacket();
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();

  counter++;

  delay(1000);
}

You're missing two lines I'd think:

  SPI.begin(SCK, MISO, MOSI, SS);
  // put the right pin numbers or -1 for default. On my TTGO it's 5, 19, 27, 18
  LoRa.setPins(SS, RST, DI0);
  // on my TTGO it's 18, 14, 26

adding SPI.begin(SCK, MISO, MOSI, -1); fixed my issue (the same error as reported Starting Lora Failed )