#include <LiquidCrystal.h>
 
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
const uint8_t buttonPins[] = { 7, 6, 5, 4, 3, 2};
int i = 0;
int i2 = -1;
 
uint8_t heart[8] = {
  0b00000,
  0b01010,
  0b11111,
  0b11111,
  0b11111,
  0b01110,
  0b00100,
  0b00000,
};

#define BUTTON_PIN_5 7
#define BUTTON_PIN_10 6
#define BUTTON_PIN_20 5
#define BUTTON_PIN_50 4
#define BUTTON_PIN_100 3
#define BUTTON_PIN_200 2

void setup() {
  lcd.createChar(3, heart);
  lcd.begin(20, 2);
  lcd.setCursor(2, 1);
  lcd.print("I \x03 Arduino");
  //Serial.begin(115200);
  pinMode(BUTTON_PIN_5, INPUT_PULLUP);
  pinMode(BUTTON_PIN_10, INPUT_PULLUP);
  pinMode(BUTTON_PIN_20, INPUT_PULLUP);
  pinMode(BUTTON_PIN_50, INPUT_PULLUP);
  pinMode(BUTTON_PIN_100, INPUT_PULLUP);
  pinMode(BUTTON_PIN_200, INPUT_PULLUP);
}
 
int lastState = HIGH;
int lastState2 = HIGH;
int lastState3 = HIGH;
int lastState4 = HIGH;
int lastState5 = HIGH;
int lastState6 = HIGH;
 
void loop() {
  int value = digitalRead((BUTTON_PIN_5));
  int value2 = digitalRead((BUTTON_PIN_10));
  int value3 = digitalRead((BUTTON_PIN_20));
  int value4 = digitalRead((BUTTON_PIN_50));
  int value5 = digitalRead((BUTTON_PIN_100));
  int value6 = digitalRead((BUTTON_PIN_200));
 
  if (lastState != value) {
    lastState = value;
    if (value == HIGH) {
      i += 5;
    }
  }
 
  if (lastState2 != value2) {
    lastState2 = value2;
    if (value2 == HIGH) {
      i += 10;
    }
  }
 
  if (lastState3 != value3) {
    lastState3 = value3;
    if (value3 == HIGH) {
      i += 20;
    }
  }
 
  if (lastState4 != value4) {
    lastState4 = value4;
    if (value4 == HIGH) {
      i += 50;
    }
  }
 
  if (lastState5 != value5) {
    lastState5 = value5;
    if (value5 == HIGH) {
      i += 100;
    }
  }
 
  if (lastState6 != value6) {
    lastState6 = value6;
    if (value6 == HIGH) {
      i += 200;
    }
  }
 
  if (i != i2) {
    i2 = i;
    //Serial.println(i);
    lcd.createChar(2, i);
    lcd.setCursor(0, 3);
    lcd.print(i);
    }
}