#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);

int pin13 = LOW;

byte up[8] =  // ^
{
  B00000,
  B00100,
  B00100,
  B01110,
  B01110,
  B11111,
  B11111,
  B00000, 
};

byte down[8] =  // v
{
  B00000,
  B11111,
  B11111,
  B01110,
  B01110,  
  B00100,
  B00100,
  B00000,
};

byte yes[8] =
{
  B00001,
  B00001,
  B00010,
  B00010,
  B00100,  
  B10100,
  B01000,
  B01000,  
};

byte no[8] =
{
  B10001,
  B10001,
  B01010,
  B00100,
  B00100,  
  B01010,
  B10001,
  B10001,  
};

void setup()
{
  Serial.begin(9600);

  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  

  pinMode(2, INPUT);
  attachInterrupt(0, btnIsr, FALLING);


  lcd.init();
  lcd.backlight();
  lcd.createChar(0, up);
  lcd.createChar(1, down);
  lcd.createChar(2, yes);
  lcd.createChar(3, no);

  lcd.setCursor(0,1);
  lcd.write(byte(0));
  lcd.setCursor(5,1);
  lcd.write(byte(1));
  lcd.setCursor(10,1);
  lcd.write(byte(2));
  lcd.setCursor(15,1);
  lcd.write(byte(3));

}

void btnIsr(){
  pin13 = !pin13;
  digitalWrite(13, pin13);
  tone(12, 250, 250);
}

void loop()
{
  
  // static unsigned long tmr = 0;
  // if(millis() - tmr > 1000){
  //   tmr = millis();
  //   Serial.println("sec");
  // }
}