#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define LED_RED 6
#define LED_GREEN 5
#define LED_BLUE 3

#define RED_BUTTON 2
#define GREEN_BUTTON 4

byte smile[8] = {
    B10101,
    B00000,
    B00000,
    B10001,
    B00000,
    B00000,
    B10001,
    B01110,
};

void initRGB()
{
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);

  pinMode(LED_RED, OUTPUT);
  digitalWrite(LED_RED, LOW);

  pinMode(LED_GREEN, OUTPUT);
  digitalWrite(LED_GREEN, LOW);

  pinMode(LED_BLUE, OUTPUT);
  digitalWrite(LED_BLUE, LOW);
}

void initButtons()
{
  pinMode(RED_BUTTON, INPUT_PULLUP);
  pinMode(GREEN_BUTTON, INPUT_PULLUP);
}

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

  lcd.createChar(0, smile);

  lcd.setCursor(0, 0);
  lcd.print("Hello");
  lcd.setCursor(3, 1);
  lcd.print("World!");

  lcd.setCursor(15, 0);
  lcd.write(byte(0));
}
void blinkRedLed()
{
    const unsigned long BlinkChangePeriod = 900UL;
    static int ledState = LOW;
    static unsigned long lastBlinkChange = 0UL;

    if (millis() - lastBlinkChange >= BlinkChangePeriod)
    {
        if (ledState == HIGH)
        {
            ledState = LOW;
        }
        else
        {
            ledState = HIGH;
        }

        digitalWrite(LED_RED, ledState);
        lastBlinkChange += BlinkChangePeriod;
    }
}
void loop()
{
}