#include <LiquidCrystal.h>
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
#define PULSANTE 6
#define NFRASI 10

LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);

char frasi[NFRASI][16] = {
  "",
  "A<3",
  "B",
  "C",
  "D",
  "E",
  "F",
  "G",
  "H",
  "I",
};

char visFrase = 0;
char old_visFrase = 0;
char old_button;

void setup() {
  lcd.begin(16, 2);
  pinMode(PULSANTE, INPUT);
}

void loop() {
  char button = digitalRead(PULSANTE);

  if (button == LOW && old_button == HIGH)
  {
    visFrase++;
    if (visFrase > NFRASI - 1) visFrase = 0;
  }
  old_button = button;

  if (visFrase != old_visFrase)
  {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(frasi[visFrase]);
    old_visFrase = visFrase;
  }
}