Hello, I have TTGO's setup with the Lora.h library(Sandeep). Works fine but I wish to alter some of the default parameters. I have had no luck searching for how to do this so I copied a parameters list from the library and copied them into my code just after Lora.begin. I commented out all but spread factor for both tx and rx sketches. The rx no longer receives so I reverted back to my original sketches and it works again. I have included some copied text from Lora.h api.
Can anyone enlighten me on how to do this?
/*********
Rui Santos
Complete project details at https://RandomNerdTutorials.com/ttgo-lora32-sx1276-arduino-ide/
*********/
//Libraries for LoRa
#include <SPI.h>
#include <LoRa.h>
//Libraries for OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
//define the pins used by the LoRa transceiver module
#define SCK 5
#define MISO 19
#define MOSI 27
#define SS 18
#define RST 23
#define DIO0 26
//433E6 for Asia
//866E6 for Europe
//915E6 for North America
#define BAND 915E6
//OLED pins
#define OLED_SDA 21
#define OLED_SCL 22
#define OLED_RST -1
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define SCREEN_ADDRESS 0x3c
//packet counter
int counter = 0;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RST);
//////////////////////////////////////SETUP////////////////////////////////////////////////////////
void setup() {
//initialize Serial Monitor
Serial.begin(115200);
//reset OLED display via software
pinMode(OLED_RST, OUTPUT);
digitalWrite(OLED_RST, LOW);
delay(20);
digitalWrite(OLED_RST, HIGH);
//initialize OLED
Wire.begin(OLED_SDA, OLED_SCL);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c, false, false)) { // Address 0x3C for 128x32
Serial.println(F("SSD1306 allocation failed"));
for(;;); // Don't proceed, loop forever
}
display.clearDisplay();
display.setTextColor(WHITE);
display.setTextSize(1);
display.setCursor(0,0);
display.print("LORA SENDER ");
display.display();
Serial.println("LoRa Sender Test");
//SPI LoRa pins
SPI.begin(SCK, MISO, MOSI, SS);
//setup LoRa transceiver module
LoRa.setPins(SS, RST, DIO0);
if (!LoRa.begin(BAND)) {
Serial.println("Starting LoRa failed!");
while (1);
// Set Lora parameters
//LoRa.setTxPower(17, PA_OUTPUT_PA_BOOST_PIN);//Supported values are between 2 and 17 for PA_OUTPUT_PA_BOOST_PIN
LoRa.setSpreadingFactor(10);
//LoRa.setSignalBandwidth(62.5E3);
//LoRa.setCodingRate4(7); //min 5- max 8
//setPreambleLength(long length);
//setSyncWord(int sw);
//LoRa.enableCrc();
// LoRa.disableCrc();
//enableInvertIQ();
//disableInvertIQ()
}
Serial.println("LoRa Initializing OK!");
display.setCursor(0,10);
display.print("LoRa Initializing OK!");
display.display();
delay(2000);
}
///////////////////////////LOOP//////////////////////////////////////////////
void loop() {
Serial.print("Sending packet: ");
Serial.println(counter);
//Send LoRa packet to receiver
LoRa.beginPacket();
LoRa.print("hello ");
LoRa.print(counter);
LoRa.endPacket();
display.clearDisplay();
display.setCursor(0,0);
display.println("LORA SENDER");
display.setCursor(0,20);
display.setTextSize(1);
display.print("LoRa packet sent.");
display.setCursor(0,30);
display.print("Counter:");
display.setCursor(50,30);
display.print(counter);
display.display();
counter++;
delay(10000);
}
From Lora.h api
Radio parameters
TX Power
Change the TX power of the radio.
LoRa.setTxPower(txPower);
LoRa.setTxPower(txPower, outputPin);
txPower - TX power in dB, defaults to 17
outputPin - (optional) PA output pin, supported values are PA_OUTPUT_RFO_PIN and PA_OUTPUT_PA_BOOST_PIN, defaults to PA_OUTPUT_PA_BOOST_PIN.
Supported values are 2 to 20 for PA_OUTPUT_PA_BOOST_PIN, and 0 to 14 for PA_OUTPUT_RFO_PIN.
Most modules have the PA output pin connected to PA BOOST,
Frequency
Change the frequency of the radio.
LoRa.setFrequency(frequency);
frequency - frequency in Hz (433E6, 868E6, 915E6)
Spreading Factor
Change the spreading factor of the radio.
LoRa.setSpreadingFactor(spreadingFactor);
spreadingFactor - spreading factor, defaults to 7
Supported values are between 6 and 12. If a spreading factor of 6 is set, implicit header mode must be used to transmit and receive packets.
