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Examples > EEPROM Library

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.

Code

#include <EEPROM.h>

// the current address in the EEPROM (i.e. which byte
// we're going to write to next)
int addr = 0;

void 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.  there are 512 bytes in 
  // the EEPROM, so go back to 0 when we hit 512.
  addr = addr + 1;
  if (addr == 512)
    addr = 0;

  delay(100);
}

See also