#include "EEPROM.h"
#define EEPROM_SIZE 4
char charBuffer[100];
int var0, var1, var2, var3;

void setup() {
 Serial.begin(115200);
 if (!EEPROM.begin(EEPROM_SIZE)) {
 Serial.println("Failed init EEPROM");
 delay(1000);
 ESP.restart();
 }
 //Write
 Serial.println("Success init EEPROM");

 EEPROM.writeUChar(0, 1);
 EEPROM.commit();
 EEPROM.writeUChar(1, 100);
 EEPROM.commit();
 EEPROM.writeUChar(2, 200);
 EEPROM.commit();
 EEPROM.writeUChar(3, 255);
 EEPROM.commit(); 

 Serial.println("Write EEPROM Complete");
//Read
 Serial.println("Success init EEPROM");
 var0 = EEPROM.readUChar(0);
 var1 = EEPROM.readUChar(1);
 var2 = EEPROM.readUChar(2);
 var3 = EEPROM.readUChar(3);
 sprintf(charBuffer, "EEPROM Data>>> var0 %03d | var1 %03d | var2 %03d | var3 %03d\n", var0, var1, var2, var3);
 Serial.println(charBuffer);
 Serial.println("Read EEPROM Complete");
}
void loop() {
// Nothing
}