Oh LoRa can’t you see… well she doesn’t here

Q&A Forum › Category: ESP32 › Oh LoRa can’t you see… well she doesn’t here

DK asked 5 years ago

Just like the Song Luara can’t yo u see, she doesn’t here lol

I just loaded up code for the Lora to send Hello World to the Reciever … no joy

It appears that it is sending Hello World in the Serial Port

transmitter

#include <SPI.h>
#include <LoRa.h> 
void setup()
{
Serial.begin(115200);
Serial.println("LoRa Sender starting...");
LoRa.setPins(18, 14, 26); // LoRa.setPins(CS, RESET, IRQ); 
LoRa.setSyncWord(0xF3);
if (!LoRa.begin(868E6)) { // Set frequency to 433, 868 or 915MHz
Serial.println("Could not find a valid LoRa transceiver, check pins used and wiring!");
delay(1000);
}
}

void loop() 
{
LoRa.beginPacket(); // Start LoRa transceiver
LoRa.print("Hello World"); 
Serial.print("Hello World");
LoRa.endPacket(); 
// 
delay(1000);
}

Message

rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:928
ho 0 tail 12 room 4
load:0x40078000,len:8424
ho 0 tail 12 room 4
load:0x40080400,len:5868
entry 0x4008069c
LoRa Sender starting...
Hello WorldHello WorldHello WorldHello World 
rst:0x1

Receiver

#include <SPI.h>

#include <LoRa.h>
void setup() {
Serial.begin(115200);
Serial.println("LoRa Receiver");
LoRa.setPins(18, 14, 26);
LoRa.setSyncWord(0xF3);
if (!LoRa.begin(866E6)) {
Serial.println("Starting LoRa failed!");
while (1);
}
}
void loop()
{
// try to parse packet
String packet = "";
int packetSize = LoRa.parsePacket();
if (packetSize) 
{
// received a packet
Serial.print("Received packet ");
// read packet
while (LoRa.available()) 
{
Serial.print((char)LoRa.read());
// packet = LoRa.readString();
}
// Serial.print(packet);
// print RSSI of packet
Serial.print(" RSSI was: ");
Serial.println(LoRa.packetRssi());
}
}

Message

(POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:928
ho 0 tail 12 room 4
load:0x40078000,len:8424
ho 0 tail 12 room 4
load:0x40080400,len:5868
entry 0x4008069c
LoRa Receiver

I am using this: banggood.com/Wemos-TTGO-2Pcs-ESP32-SX1276-LoRa-868MHz-bluetooth-WI-FI-Lora-Internet-Antenna-Development-Board-For-Arduino-p-1295045.html

Regards

derek

3 Answers

0 Vote Up Vote Down

Sara Santos Staff answered 5 years ago

Hi Derek.
You code seems to be fine, but you have the following line commented:

// packet = LoRa.readString();

That’s the line that receives the packet. If it is commented, you won’t receive the message.

Regards,
Sara

0 Vote Up Vote Down

DK answered 5 years ago

Hi Sara,

I did what you said from comment .. still no message received

But I assumed that

Serial.print((char)LoRa.read());
=
packet = LoRa.readString();
Serial.print(packet);

I swap the LoRas around so transmitter is now receiver .. no joy

I also increased the power level

LoRa.setTxPower(txPower); //to 20 ..

recommended on https://github.com/sandeepmistry/arduino-LoRa/issues/146 and change frequencies

LoRa.setSPIFrequency(1E6);
LoRa.setSignalBandwidth(7.8E3); … no message

I am running these LoRa’s with no Headers soldered form this: youtube.com/watch?v=0xP1h1Qx4Ao

Regards
derek

0 Vote Up Vote Down

Sara Santos Staff answered 5 years ago

Hi Derek.

I guess you are right, those lines should do the same thing.

Everything seems to be fine with your code and you’re setting the right pins for your boards. So, it should be working.

So, the software shouldn’t be the problem. Can you try removing the syncword in both codes and see if it works?

It can be a power issue, broken antenna, or the board is not working properly. It is very difficult to figure out what can be wrong :/

Regards,
Sara