Arduino KEYWORDS(5)

EEPROM Clear

/*Sets all of the bytes of the EEPROM to 0.*/

#include [EEPROM.h]
/*these should be Less-than & Greater-than brackets
  but Blogger thinks they're HTML :-( */

void setup()
{
  // write a 0 to all 512 bytes of the EEPROM
  for (int i = 0; i [ 512; i++)
    EEPROM.write(i, 0);

  // turn the LED on when we're done
  digitalWrite(13, HIGH);
}//end setup()

void loop()
{}//end empty looop

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 [EEPROM.h] //see note above
/* the current address in the EEPROM
(i.e. which byte we're going to write to next) */
int addr = 0;

void setup() { } //end 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.
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);
}//end loop()

EEPROM Read

/*Reads the value of each byte of the EEPROM
and prints it to the computer.*/

#include [EEPROM.h]

// start reading from the first byte (address 0) of the EEPROM
int address = 0;
byte value;

void setup()
{
  Serial.begin(9600);
}//end setup()

void loop()
{
  // read a byte from the current address of the EEPROM
  value = EEPROM.read(address);

  Serial.print(address);
  Serial.print("\t");
  Serial.print(value, DEC);
  Serial.println();

  // advance to the next address of the EEPROM
  address = address + 1;

  /* there are only 512 bytes of EEPROM, from 0 to 511, so if we're
      on address 512, wrap around to address 0 */
  if (address == 512)
    address = 0;

  delay(500);
}//end loop()