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lib/SX12XX-LoRa/examples/SX127x_examples/Basics/58_FM_Tone/58_FM_Tone.ino

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+/*******************************************************************************************************
+  Programs for Arduino - Copyright of the author Stuart Robinson - 23/02/20
+
+  This program is supplied as is, it is up to the user of the program to decide if the program is
+  suitable for the intended purpose and free from errors. 
+*******************************************************************************************************/
+
+
+/*******************************************************************************************************
+  Program Operation - Transmits a FM tone using the LoRa device that can be picked up on an FM UHF 
+  handheld receiver. The tones are not true FM but the UHF receiver does not know that. 
+  
+  Serial monitor baud rate is set at 9600
+*******************************************************************************************************/
+
+#define Program_Version "V1.0"
+
+#include <SPI.h>                                               //the lora device is SPI based so load the SPI library                                         
+#include <SX127XLT.h>                                          //include the appropriate library  
+#include "Settings.h"                                          //include the setiings file, frequencies, LoRa settings etc   
+
+SX127XLT LT;                                                   //create a library class instance called LT
+
+
+void loop()
+{
+  Serial.print(TXpower);                                       //print the transmit power defined
+  Serial.print(F("dBm "));
+  Serial.println(F("PlayTone> "));
+  Serial.println();
+  
+  digitalWrite(LED1, HIGH);
+  LT.toneFM(1000, 1000, deviation, adjustfreq, TXpower);  
+  digitalWrite(LED1, LOW);
+  
+  delay(1000);
+}
+
+
+void led_Flash(uint16_t flashes, uint16_t delaymS)
+{
+  uint16_t index;
+  for (index = 1; index <= flashes; index++)
+  {
+    digitalWrite(LED1, HIGH);
+    delay(delaymS);
+    digitalWrite(LED1, LOW);
+    delay(delaymS);
+  }
+}
+
+
+void setup()
+{
+  pinMode(LED1, OUTPUT);                                   //setup pin as output for indicator LED
+  led_Flash(2, 125);                                       //two quick LED flashes to indicate program start
+
+  Serial.begin(9600);
+  Serial.println();
+  Serial.print(F(__TIME__));
+  Serial.print(F(" "));
+  Serial.println(F(__DATE__));
+  Serial.println(F(Program_Version));
+  Serial.println();
+  Serial.println(F("58_FM_Tone Starting"));
+
+  SPI.begin();
+
+  //SPI beginTranscation is normally part of library routines, but if it is disabled in library
+  //a single instance is needed here, so uncomment the program line below
+  //SPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));
+
+  //setup hardware pins used by device, then check if device is found
+  if (LT.begin(NSS, NRESET, DIO0, DIO1, DIO2, LORA_DEVICE))
+  {
+    Serial.println(F("LoRa Device found"));
+    led_Flash(2, 125);                                   //two further quick LED flashes to indicate device found
+    delay(1000);
+  }
+  else
+  {
+    Serial.println(F("No device responding"));
+    while (1)
+    {
+      led_Flash(50, 50);                                 //long fast speed LED flash indicates device error
+    }
+  }
+  
+  LT.setupDirect(Frequency, Offset);
+  Serial.print(F("Tone Transmitter ready"));
+  Serial.println();
+}
+

lib/SX12XX-LoRa/examples/SX127x_examples/Basics/58_FM_Tone/Settings.h

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+/*******************************************************************************************************
+  Programs for Arduino - Copyright of the author Stuart Robinson - 23/02/20
+
+  This program is supplied as is, it is up to the user of the program to decide if the program is
+  suitable for the intended purpose and free from errors.
+*******************************************************************************************************/
+
+//*******  Setup hardware pin definitions here ! ***************
+
+//These are the pin definitions for one of my own boards, the Easy Pro Mini,
+//be sure to change the definitions to match your own setup. Some pins such as DIO1,
+//DIO2 are not used by this particular sketch so they are set to -1 and not connected.
+
+#define NSS 10                                  //select pin on LoRa device
+#define NRESET 9                                //reset pin on LoRa device
+#define LED1 8                                  //on board LED, high for on
+#define DIO0 3                                  //DIO0 pin on LoRa device, used for RX and TX done 
+#define DIO1 -1                                 //DIO1 pin on LoRa device, normally not used so set to -1 
+#define DIO2 -1                                 //DIO2 pin on LoRa device, normally not used so set to -1
+
+#define LORA_DEVICE DEVICE_SX1278               //we need to define the device we are using
+
+
+//*******  Setup Direct Modem Parameters Here ! ***************
+
+const uint32_t Frequency = 434000000;           //frequency of transmissions in hertz
+const uint32_t Offset = 0;                      //offset frequency for calibration purposes
+const uint16_t deviation = 10000;               //deviation, total frequency shift low to high
+const float adjustfreq = 0.9;                   //adjustment to tone frequency 
+
+const int8_t TXpower = 10;                      //LoRa transmit power in dBm
+