LoRa 32 WIFI Sender Code

LoRa_sender.ino

#include <SPI.h>
#include <LoRa.h>
#include <Wire.h> //responsible for i2c communication
#include "SSD1306Wire.h"

#define SS 18
#define RST 14
#define DI0 26

#define current 13 //current value

float v=0,p=0,e=0;//voltage, power and energy values
SSD1306Wire display(0x3c, 4, 15);

void setup() {
  //set pins as output
  pinMode(16,OUTPUT);//OLED RST
  pinMode(25,OUTPUT);
  digitalWrite(16, LOW);//reset OLED
  delay(50); 
  digitalWrite(16, HIGH);//while OLED is on, GPIO16 might be HIGH
  //starts LoRa's display
  display.init();
  display.flipScreenVertically(); 
  display.setFont(ArialMT_Plain_10);

  SPI.begin(5, 19, 27, 18);
  LoRa.setPins(SS, RST, DI0);
  
  Serial.begin(4800);
  while (!Serial);

  //clear LoRa's display
  display.clear();
  //433E6, 868E6, 915E6
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    display.drawString(0, 0, "LoRa Initial failed!");
    while (1);
  } else {
    display.drawString(0, 0, "LoRa Initial success!");
  }  
  //showcase the string on LoRa's display
  display.display();
}

void loop() {
  //reads output voltage and calculates input voltage
  v=(analogRead(36)*3.35/4096)*(23700/1700);
  if(v>3)
    v+=3;
  //gets power value
  p=v*current;
  //add power to energy
  e+=((p/1000)/3600);//divide p by 1000 to obtain kW and by 3600s(1h) to get kWh
  //starts LoRa packet
  LoRa.beginPacket();
  //writes on the packet
  LoRa.print(v);
  LoRa.print("V POWER: ");
  LoRa.print(p);
  LoRa.print("W ENERGY: ");
  LoRa.print(e);
  LoRa.print("kWh");
  //ends the packet
  LoRa.endPacket();
  //dlear LoRa's display
  display.clear();
  display.drawString(0, 0, "GSE - SENDER");
  display.drawString(0, 10, "Packet: ");
  String rssi = (String)LoRa.packetRssi();
  display.drawString(0, 20, "RSSI:");
  display.drawString(50, 20, rssi);
  display.display();//showcase the string on LoRa's display
  //pause for 1 seconds
  delay(1000);
}