#include <EEPROM.h>

struct MyData {
  int intValue;
  float floatValue;
  char name[10];
};

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

  Serial.println("EEPROM Demo Starting...");

  // ---------------------------
  // 1. EEPROM size
  // ---------------------------
  Serial.print("EEPROM size: ");
  Serial.println(EEPROM.length());

  // ---------------------------
  // 2. WRITE (raw byte)
  // ---------------------------
  EEPROM.write(0, 123);  // writes 1 byte (0–255)
  Serial.println("EEPROM.write(0, 123)");

  // ---------------------------
  // 3. READ (raw byte)
  // ---------------------------
  byte val = EEPROM.read(0);
  Serial.print("EEPROM.read(0): ");
  Serial.println(val);

  // ---------------------------
  // 4. UPDATE (only writes if different)
  // ---------------------------
  EEPROM.update(0, 200);
  Serial.println("EEPROM.update(0, 200)");

  Serial.print("After update: ");
  Serial.println(EEPROM.read(0));

  // ---------------------------
  // 5. PUT (write struct / multi-byte data)
  // ---------------------------
  MyData dataToWrite = {42, 3.14, "Arduino"};

  EEPROM.put(10, dataToWrite);
  Serial.println("EEPROM.put() wrote struct at address 10");

  // ---------------------------
  // 6. GET (read struct / multi-byte data)
  // ---------------------------
  MyData dataRead;
  EEPROM.get(10, dataRead);

  Serial.println("EEPROM.get() result:");
  Serial.print("intValue: ");
  Serial.println(dataRead.intValue);

  Serial.print("floatValue: ");
  Serial.println(dataRead.floatValue);

  Serial.print("name: ");
  Serial.println(dataRead.name);

  // ---------------------------
  // 7. LOOP through EEPROM
  // ---------------------------
  Serial.println("First 20 bytes of EEPROM:");

  for (int i = 0; i < 20; i++) {
    Serial.print("Addr ");
    Serial.print(i);
    Serial.print(": ");
    Serial.println(EEPROM.read(i));
  }

  Serial.println("Done.");
}

void loop() {
  // nothing here
}