#include <EEPROM.h>
 
/** the current address in the EEPROM (i.e. which byte we're going to write to next) **/
int address = 0;
int val=0;
void setup() {
  /** EMpty setup **/
}
 
void loop() {
   /***
    Update the particular EEPROM cell.
    these values will remain there when the board is
    turned off.
  ***/
  EEPROM.update(address, val);
  val+=1;
   /***
    The function EEPROM.update(address, val) is equivalent to the following:
 
    if( EEPROM.read(address) != val ){
      EEPROM.write(address, val);
    }
  ***/
 
  /***
    Advance to the next address, when at the end restart at the beginning.
 
    Larger AVR processors have larger EEPROM sizes, E.g:
    - Arduno Duemilanove: 512b EEPROM storage.
    - Arduino Uno:        1kb EEPROM storage.
    - Arduino Mega:       4kb EEPROM storage.
 
    Rather than hard-coding the length, you should use the pre-provided length function.
    This will make your code portable to all AVR processors.
  ***/
  address = address + 1;
  if (address == EEPROM.length()) {
    address = 0;
  }
  delay(300);
}