This is the code for the Arduino and LoRa SX1278 radio module receiver example for 1 byte data. Read all comments in the code in order to understand more. Downlaod the code from the link below or just copy the code from below as well.
/* 1byte LORa SX1278 TRANSMITTER example.
/* Tutorial link: http://electronoobs.com/eng_arduino_tut97.php
 * Code: http://electronoobs.com/eng_arduino_tut97_code1.php
 * Scheamtic: http://electronoobs.com/eng_arduino_tut97_sch1.php
 * Youtube Channel: http://www.youtube/c/electronoobs   
 * 
  Module SX1278 // Arduino UNO/NANO    
    GND         ->   GND
    Vcc         ->   3.3V
    MISO        ->   D12
    MOSI        ->   D11     
    SLCK        ->   D13
    Nss         ->   D10
    Di00        ->   D2
    RST         ->   D9       
 */
#include <SPI.h>
#include <LoRa.h> //Download here: http://electronoobs.com/eng_arduino_LoRa_SX1278.php.php
int pot = A2;
void setup() {
  Serial.begin(9600);
  pinMode(pot,INPUT);
  
  while (!Serial);  
  Serial.println("LoRa Sender");
  if (!LoRa.begin(433E6)) { // or 915E6, the MHz speed of yout module
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}
void loop() {
  int val = map(analogRead(pot),0,1024,0,255);
  LoRa.beginPacket();  
  LoRa.print(val);
  LoRa.endPacket();
  delay(50);
 
}