#include <EEPROM.h>
#include <Wire.h> // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library for LCD

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 20, 4); // Change to (0x27,20,4) for 20x4 LCD.

const unsigned int MAX_MESSAGE_LENGTH = 12;

void writeStringToEEPROM(int addrOffset, const String &strToWrite)
{
  byte len = strToWrite.length();
  EEPROM.write(addrOffset, len);
  for (int i = 0; i < len; i++)
  {
    EEPROM.write(addrOffset + 1 + i, strToWrite[i]);
  }
}
String readStringFromEEPROM(int addrOffset)
{
  int newStrLen = EEPROM.read(addrOffset);
  char data[newStrLen + 1];
  for (int i = 0; i < newStrLen; i++)
  {
    data[i] = EEPROM.read(addrOffset + 1 + i);
  }
  data[newStrLen] = '\0'; // !!! NOTE !!! Remove the space between the slash "/" and "0" (I've added a space because otherwise there is a display bug)
  return String(data);
}

void setup() {
 Serial.begin(9600);

 lcd.init();
 lcd.backlight();
 lcd.clear();
}

void loop() {

 //Check to see if anything is available in the serial receive buffer
 while (Serial.available() > 0)
 {
   //Create a place to hold the incoming message
   static char message[MAX_MESSAGE_LENGTH];
   static unsigned int message_pos = 0;

   //Read the next available byte in the serial receive buffer
   char inByte = Serial.read();

   //Message coming in (check not terminating character) and guard for over message size
   if ( inByte != '\n' && (message_pos < MAX_MESSAGE_LENGTH - 1) )
   {
     //Add the incoming byte to our message
     message[message_pos] = inByte;
     message_pos++;
   }
   //Full message received...
   else
   {
     //Add null character to string
     message[message_pos] = '\0';

     //Print the message (or do other things)
     Serial.println(message);

     writeStringToEEPROM(10, message);

     String retrievedString = readStringFromEEPROM(10);
     Serial.print("The String we read from EEPROM:");
     Serial.println(retrievedString);

     lcd.setCursor(0, 0); // Set the cursor on the third column and first row.
     lcd.print(retrievedString); // Print the string "Hello World!"

     //Reset for the next message
     message_pos = 0;
   }
 }
}