EEPROM

/*

* 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>

int led = 13;

int address = 0;

byte value;

// the current address in the EEPROM (i.e. which byte

// we're going to write to next)

int addr = 0;

void setup()

{

// initialize serial and wait for port to open:

Serial.begin(115200);

pinMode(led, OUTPUT);

}

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(5);

value = EEPROM.read(address);

Serial.print(float(millis()),2);

Serial.print("\t");

Serial.print(address);

Serial.print("\t");

Serial.print(4*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;

// digitalWrite(13,HIGH);

// delay(5);

// digitalWrite(13,LOW);

}