#include <LiquidCrystal.h>
 
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
const uint8_t buttonPins[] = { 7, 6, 5, 4, 3, 2 };
const int buttonTones[] = { 5, 10, 20, 50, 100, 200 };
int i = 0;
int i2 = -1;
int pitch = 0;
int lastState[] = { 1, 1, 1, 1, 1, 1 };

void setup() {
  Serial.begin(115200);
  lcd.begin(20, 4);
  for (uint8_t i = 0; i < 6; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
}
 
void loop() {
  
  for (uint8_t x = 0; x < 6; x++) {
    int value = digitalRead((buttonPins[x]));
    if (lastState[x] != value) {
      lastState[x] = value;
      if (value == HIGH) {
        i += buttonTones[x];
        //Serial.println(i);
      }
    }

  if (i != i2) {
    i2 = i;
    lcd.setCursor(0, 1);
    lcd.print("osszeg: ");
    lcd.createChar(2, i);
    lcd.setCursor(8, 1);
    lcd.print(i);
    lcd.setCursor(12, 1);
    lcd.print(" Ft");
    }
  }
}