#include <EEPROM.h>
#define interruptPin 27
#define IncValue 12
#define DecValue 14
volatile byte value;
volatile byte addr = 0;
 
void setup() {
  Serial.begin(9600);
  pinMode(IncValue, INPUT_PULLUP);
  pinMode(DecValue, INPUT_PULLUP);
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), mem2eeprom, FALLING);
  
  for (int i = 0; i <= 10; i++)  {
    value = EEPROM.read(i);
    Serial.print("Address ");
    Serial.print(i);
    Serial.print(" ---> ");
    Serial.print(value);
    Serial.println();
    delay(100);
  }
}


void loop() {
  if (digitalRead(IncValue) == LOW)  {
    value++;
    Serial.print("Data changed to: "); Serial.println(value);
  }
  else if (digitalRead(DecValue) == LOW)  {
    value--;
    Serial.print("Data changed to: "); Serial.println(value);
  }
  delay(150);
}


void mem2eeprom() {
  EEPROM.write(addr, value);
  Serial.print("Write data "); Serial.print(value);
  Serial.print(" to EEPROM address "); Serial.println(addr);
  addr++;
}