/* * EEPROM Write * * Stores values read from analog input 0 into the EEPROM. * These values will stay in the EEPROM when the board is * turned off and may be retrieved later by another sketch. */ #include /** the current address in the EEPROM (i.e. which byte we're going to write to next) **/ unsigned int addr = 0; void setup(){ /** Empty setup. **/} void loop() { /*** Need to divide by 4 because analog inputs range from 0 to 1023 and each byte of the EEPROM can only hold a value from 0 to 255. ***/ int val = analogRead(0) / 4; /*** Write the value to the appropriate byte of the EEPROM. these values will remain there when the board is turned off. ***/ EEPROM.write(addr, 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. - Teensy 3.0 & 3.1: 2kb EEPROM storage. - Teensy-LC: 128b EEPROM storage. - Teensy 2.0: 1kb EEPROM storage. - Teensy++ 2.0: 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. ***/ addr = addr + 1; if(addr == EEPROM.length()) addr = 0; /*** As the EEPROM sizes are powers of two, wrapping (preventing overflow) of an EEPROM address is also doable by a bitwise and of the length - 1. ++addr &= EEPROM.length() - 1; ***/ delay(100); }