(:source http://github.com/arduino/Arduino/raw/master/libraries/EEPROM/examples/eeprom_read/eeprom_read.ino lang=arduino tabwidth=4:)

(:source http://github.com/arduino/Arduino/raw/master/libraries/EEPROM/examples/eeprom_read/eeprom_read.pde lang=arduino tabwidth=4:)

(:source http://github.com/arduino/Arduino/raw/master/libraries/EEPROM/examples/eeprom_write/eeprom_write.pde lang=arduino tabwidth=4:)

EEPROM Read

The microcontroller on the Arduino board has 512 bytes of EEPROM: memory whose values are kept when the board is turned off (like a tiny hard drive).

This example illustrates how to read the value of each byte EEPROM using the EEPROM.read() function, and how to print those values to the serial window.

The microcontroller on the Arduino board has 512 bytes of EEPROM: memory whose values are kept when the board is turned off (like a tiny hard drive). This example illustrates how to read the value of each byte EEPROM using the EEPROM.read() function, and how to print those values to the serial window.

There is no circuit for this example.

• EEPROM.read()
• serial.begin()
• serial.print()

There is no circuit for this example, though your Arduino must be connected to your computer to enable serial communication.

(:div class=BOM :)

Hardware Required

• Arduino Board

(:divend:)

Circuit

(:div class=circuit :) There is no circuit for this example.

image developed using Fritzing. For more circuit examples, see the Fritzing project page

(:divend:)

The microcontroller on the Arduino board has 512 bytes of EEPROM: memory whose values are kept when the board is turned off (like a tiny hard drive). This example illustrates how to read the value of each byte EEPROM using the EEPROM.read() function, and how to print those values to the serial window.

The microcontroller on the Arduino board has 512 bytes of EEPROM: memory whose values are kept when the board is turned off (like a tiny hard drive). This example illustrates how to read the value of each byte EEPROM using the EEPROM.read() function, and print those values to the computer via serial.

The microcontroller on the Arduino board has 512 bytes of EEPROM: memory whose values are kept when the board is turned off (like a tiny hard drive). This example illustrates how to reads the value of each byte EEPROM using the EEPROM.read() function, and prints it to the computer via serial.

(:source lang=arduino tabwidth=4:)

(:sourceend:)

@]

See also

• EEPROM Clear example
• EEPROM Write example
• EEPROM library reference

Examples > EEPROM Library

EEPROM Read

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

Code

#include <EEPROM.h>

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

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

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);
}