#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

bool test[8] {true,true,true,true,true,true,true,true};

void setup() {
  lcd.init();
  lcd.backlight();

  DDRD = 0;
  PORTD = 0xFF;
}

void loop() {
  int amount = 0;
  for (int i = 0; i < 8; i++) {
    if ((PIND & (1<<i)) == LOW && test[i] == true) {
      test[i] = false;
   
    } else if ((PIND & (1<<i)) != LOW && test[i] == false) {
      test[i] = true;
    }
    lcd.setCursor(i, 0);
    lcd.print(test[i]);
  }
}