Membuat Buku Catatan menggunakan Arduino

LiquidCrystal_I2C lcd(0x27, 16, 2);

char currentChar = 'A';
int charIndex = 0;
int maxChars = 32; // Maksimal 32 karakter
char note[33]; // +1 untuk null terminator

int btnNext = 2;
int btnSelect = 3;
int btnSave = 4;
int btnRead = 5;

int cursorPos = 0;

void setup() {
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Catatan Arduino");

pinMode(btnNext, INPUT_PULLUP);
pinMode(btnSelect, INPUT_PULLUP);
pinMode(btnSave, INPUT_PULLUP);
pinMode(btnRead, INPUT_PULLUP);

delay(2000);
lcd.clear();
lcd.print("Karakter: ");
lcd.print(currentChar);
}

void loop() {
if (digitalRead(btnNext) == LOW) {
delay(200);
currentChar++;
if (currentChar > 'Z') currentChar = 'A';
lcd.setCursor(10, 0);
lcd.print(currentChar);
}

if (digitalRead(btnSelect) == LOW) {
delay(200);
if (cursorPos < maxChars) {
note[cursorPos] = currentChar;
cursorPos++;
lcd.setCursor(0, 1);
for (int i = 0; i < cursorPos; i++) {
lcd.print(note[i]);
}
}
}

if (digitalRead(btnSave) == LOW) {
delay(200);
for (int i = 0; i < maxChars; i++) {
EEPROM.write(i, note[i]);
}
lcd.clear();
lcd.print("Tersimpan!");
delay(1000);
lcd.clear();
}