Description
The ESP8266 has 512 bytes of internal EEPROM, this could be useful if you need to store some settings, such as an IP address or some Wifi details
Code
The write example first
#include <EEPROM.h>
int addr = 0;
void setup()
{
EEPROM.begin(512); //Initialize EEPROM
// write to EEPROM.
EEPROM.write(addr, 'a');
addr++; //Increment address
EEPROM.write(addr, 'b');
addr++; //Increment address
EEPROM.write(addr, 'C');
//Write string to eeprom
String sample = "testing eeprom";
for(int i=0;i<sample.length();i++)
{
EEPROM.write(0x0F+i, sample[i]); //Write one by one with starting address of 0x0F
}
EEPROM.commit(); //Store data to EEPROM
}
void loop()
{
}
And now the read example
#include <EEPROM.h>
int addr = 0;
void setup()
{
EEPROM.begin(512); //Initialize EEPROM
Serial.begin(9600);
Serial.println("");
Serial.print(char(EEPROM.read(addr)));
addr++; //Increment address
Serial.print(char(EEPROM.read(addr)));
addr++; //Increment address
Serial.println(char(EEPROM.read(addr)));
//Read string from eeprom (testing eeprom)
String strText;
for(int i=0;i<14;i++)
{
strText = strText + char(EEPROM.read(0x0F+i)); //Read one by one with starting address of 0x0F
}
Serial.print(strText); //Print the text
}
void loop()
{
}Output
Open the serial monitor
abC
testing eeprom