LoRa communication between 2 esp32 using a LoRa module

[jeancaire3]

Hello !

I am trying to communicate between 2 esp32 (TTGO V2 epaper) using UART by LoRa. I am using this LoRa module : http://www.ebyte.com/en/product-view-ne ... ItNmko-Cxo


According to the circuit : https://ibb.co/xJkh8rS Rx and Tx use HS2


Here is the code of the emettor :

Code: [Select all] [Expand/Collapse]

1. HardwareSerial ss(2);  
2.  
3. uint8_t buff[16];
4. int compt=0;
5. int len=0,ret=0;;
6.  
7. union
8. {
9.   uint8_t buff[16];
10.   char tamp[16];
11. } frame;
12.  
13.  
14. void setup() {
15.   Serial.begin(9600);
16.   ss.begin(9600);
17. }
18.  
19. void loop() {
20.   compt++;
21.   sprintf(frame.tamp,"Packet:%d", compt);
22.   len=strlen(frame.tamp);
23.   Serial.println(len);Serial.println(frame.tamp);
24.   ret=ss.write(frame.buff,strlen(frame.tamp));
25.   Serial.println(ret);
26.   delay(3000);  
27.  
28. }

GeSHi © Codebox Plus Extension

The serial monitor displays this : https://ibb.co/0Yp7h5F
It shows that the emitter is working correctly.

And here is the code of the receiver :

Code: Select all

HardwareSerial ss(2);   

char buff[16];
int i=0;

void setup() {
  Serial.begin(9600);
  Serial.println("begin");
  ss.begin(9600);
}

void loop() 
{
  i=0;
  //Serial.println(ss.available());
   if(ss.available() > 1){//Read from UM402 and send to serial monitor
    String input = ss.readString();
   Serial.println(input); 
   }
  delay(20);
}

The emitter seems to be working but the receiver doesn't receive anything.

Does someone have any idea of where it may come from ?

[ESP_@In逍遥子]

This may be a lora related question，but we can't test lora.

[ESP_@In逍遥子]

Hi, you can try to establish basic communication between esp32 using lora module.

[Ghboy358]

I have successfully attached adafruit rfm95w LoRa modules to Esp32 The thing by sparkfun through SPI

[brolly759]

I am wondering on a more fundamental question your application. Why would you use LoRa as a bridge between 2 ESP32. LoRa modulation requires a 1% duty cycle and depending on your amount of data you should not be transmitting that often. ie, 1 second TX time = 100 seconds wait time before being able to send the next one. The LoraWan stack locks you down even further.