LORA COMMUNICATION USING NANO

[Srivardhan06]

I'm working on lora communication using nano i m not receving the data
and some times i'm receving the garabage values like:????????????
can you help me in this issue

thank you

[sercero]

Huh?

Please tell more about your setup, what are you using. How did you connect everything?

Which code are you using? The sender and receiver samples?

[Srivardhan06]

IM USING NANO AND LORA SX1278

SENDER CODE :

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

byte msgCount = 0; // Count of outgoing messages
byte localAddress = 0xBB; // Address of this device
byte destination = 0xFF; // Destination to send to
long lastSendTime = 0; // Last send time
int interval = 3000; // Interval between sends

/*

• Transmitter side Code

Module SX1278 // Arduino UNO/NANO
Vcc -> 3.3V
MISO -> D12
MOSI -> D11
SLCK -> D13
Nss -> D10
GND -> GND
*/

void setup() {
Serial.begin(115200);

while (!Serial);
Serial.println("LoRa Sender");

if (!LoRa.begin(433E6)) { // or 915E6, the MHz speed of your module
Serial.println("Starting LoRa failed!");
while (1);
}
}

void loop() {
String MyMessage = "Hello World";
LoRa.beginPacket();
LoRa.print(MyMessage);
LoRa.endPacket();
delay(300);
}

RECEIVER CODE :

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

byte data[50];
byte msgCount = 0; // Count of outgoing messages
byte localAddress = 0xFF; // Address of this device
byte destination = 0xBB; // Destination to send to
long lastSendTime = 0; // Last send time
int interval = 300; // Interval between sends

/*
*** Receiver Side Code**

#include <SPI.h>
#include <LoRa.h>
String inString = ""; // string to hold incoming charaters
String MyMessage = ""; // Holds the complete message

void setup() {
Serial.begin(115200);

while (!Serial);
Serial.println("LoRa Receiver");
if (!LoRa.begin(433E6)) { // or 915E6
Serial.println("Starting LoRa failed!");
while (1);
}
}

void loop() {

// try to parse packet
int packetSize = LoRa.parsePacket();
if (packetSize) {
// read packet
while (LoRa.available())
{
int inChar = LoRa.read();
inString += (char)inChar;
MyMessage = inString;
}
inString = "";
LoRa.packetRssi();
}

Serial.println(MyMessage);

}

[Srivardhan06]

I'M Connecting the pins from sx`1278 to nano

and i'm providing the external power supply for lora

Module SX1278 // Arduino NANO
Vcc -> 3.3V
MISO -> D12
MOSI -> D11
SLCK -> D13
Nss -> D10
GND -> GND
DI00 -> D2
RST -> RST

[Srivardhan06]

I'M using nano for both transmitter and receiver side

OUTPUT

Transmitter side :

LoRa Sender

receiver side :

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S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
S��LN�cn���
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S��LN�cn���
S��LN�cn���

[sercero]

Tomorrow I'll get those modules 😊

We might have very similar setups...

Can you show a picture of how you connected everything?

Another thing... why don't you print the RSSI of the received packet?
That might help...

[Srivardhan06]

OK TQ

[Srivardhan06]

Connection are same as i said before |

Module SX1278 // Arduino NANO
Vcc -> 3.3V
MISO -> D12
MOSI -> D11
SLCK -> D13
Nss -> D10
GND -> GND
DI00 -> D2
RST -> RST

vcc pin is connected to 3.3v nano board
MISO pin is connected to D12 pin

[sercero]

I wanted to see how you did the physical connection in part to help and in part to see how to do it myself because that module I think that the holes do not align with a protoboard.

[Srivardhan06]

ok i will share

[Srivardhan06]

I have doubt should i use level converters between lora and nano

[Srivardhan06]

[sercero]

Can you take a closer picture of the connections to the module?

From this far away it seems as if the connections are wrong, for example I can't see where you connected the blue cable (GND).

[Srivardhan06]

I HAVE GIVEN COMMON GROUND FOR EXTERNAL 3.3 V SUPPLY

[Srivardhan06]

the ground from nano is given to the GROUND LINE of the bread board and ground from the external 3.3v is connected to the bread board ground line and lora is also connected to same ground line

[sercero]

Have you checked continuity between the soldered cables?

I soldered cables to that module yesterday and it is a pain in the a**.

Perhaps there is a short circuit somewhere.

[Srivardhan06]

Haa the connection are right

I have checked the continuity

[Srivardhan06]

Can i know that you are able to receive the data from lora using nano

[Srivardhan06]

If it is working can you share the circuit diagram

[sercero]

Hello, I was able to make it work.

But I'm using Arduino Pro Mini.

These are the connections:

ARDUINO --------- LoRa Module
GND <- NEGRO ---> GND
VCC <- ROJO ----> 3.3V
10  <- MARRON --> NSS
11  <- AZUL ----> MOSI
12  <- NARANJA -> MISO
13  <- BLANCO --> SCK
9   <- VIOLETA -> RST
2   <- VERDE ---> DIO0

The coil antenna seems to be pretty bad, -80dBm with two modules next to each other.

I get better reception with the modules Ra-02 and a cable as an antenna

[Srivardhan06]

can you check with Aduino nano

[Srivardhan06]

[Srivardhan06]

and can you share the outputs and also print rssi value of received packet

[sercero]

Hello, I don't have an Arduino nano so that test is not possible for me...

Is it possible that Arduino nano uses 5V?

You should use 3,3V for the LoRa modules, they might work at 5V but long term they might be damaged by that voltage.

The RSSI I'm getting is -64dBm with the modules next to each other.

[sercero]

Connection are same as i said before |

Module SX1278 // Arduino NANO Vcc -> 3.3V MISO -> D12 MOSI -> D11 SLCK -> D13 Nss -> D10 GND -> GND DI00 -> D2 RST -> RST

vcc pin is connected to 3.3v nano board MISO pin is connected to D12 pin

I see you connected RST -> RST, shouldn't it go to D9?

[Srivardhan06]

haa yes rst---> d9

[Srivardhan06]

i m using logic level converters between lora and nano
but i m getting

LoRa Receiver
Starting LoRa failed!

[Srivardhan06]

and can you share the code and as well as ouput

[sercero]

I took the code from here: https://iotprojectsideas.com/multiple-lora-nodes-communication-with-master-lora-node/

The output won't tell you much.

[Srivardhan06]

can you give me the voltage at every pins of lora at sender and receiver

[sercero]

I think you should better use a module like this:

So that you don't have issues with the soldering.

Most likely there is something wrong with the solder.

[Srivardhan06]

Hoo oky i will once again

[Srivardhan06]

And also i m receiving the data but there is a small issue that when i m sending 10 packets of data i'm only receiving 7 to 8 packets with -54 Rssi

I think there is a power supply issue with lora

[sercero]

How often are you sending the packets?

The LoRa protocol is rather limited in badwitdh

[Srivardhan06]

Is anything we need to configure for lora

[ErfanM98]

Hi @Srivardhan06 I have a similar problem. Did you find any solutions? thanks