EEPROM

1.pde

#include <EEPROM.h> // include library

int sz; // size of received data
void setup()
{
  Serial.begin(9600);
  sz = 0;
}

void loop()
{
  if(0 < Serial.available()) 
  {
    int r = Serial.read();
    
    if ('s' == r) {
      Serial.println("\nYour history");
      for(int i=0; i<sz; ++i)
        Serial.print(EEPROM.read(i));
      Serial.println();
    }
    EEPROM.write(sz++, r);
  }
  delay(200);
}