Write a byte to the EEPROM.

EEPROM.write(address, value)

address: the location to write to, starting from 0 (int) value: the value to write, from 0 to 255 (byte)

none

An EEPROM write takes 3.3 ms to complete. The EEPROM memory has a specified life of 100,000 write/erase cycles, so you may need to be careful about how often you write to it.

#include <EEPROM.h>
 
void setup()
{
  for (int i = 0; i < 512; i++)
    EEPROM.write(i, i);
}
 
void loop()
{
}

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