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.
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.