#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

const byte PIN_BTN[] = {2, 3};
const byte BTN_PRESSED = LOW;

void setup()
{
  Serial.begin(115200);	// Debugging only

  for(int i=0; i<=1; ++i)
    pinMode(PIN_BTN[i], INPUT_PULLUP);

  lcd.init();
  lcd.backlight();
  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.print(" - TEST CODE - ");

}

void loop() 
{
  for(int i=0; i<=1; ++i) {
    if(digitalRead(PIN_BTN[i]) == BTN_PRESSED) {
      lcd.setCursor(0, 1);
      lcd.print("Button "); lcd.print(i+1); lcd.print("!");
      delay(50); // Software debounce
      // Wait key release
      while (digitalRead(PIN_BTN[i]) == BTN_PRESSED)
        delay(100);
      lcd.setCursor(0, 1);
      lcd.print("            ");
    }
  }
}