#include <LiquidCrystal_I2C.h>

/*
* IMPORTANT:
* For the LCD display to work, its SDA port needs to
* be connected to the Arduino's A4 port. 
* The same goes for SCL, and A5.
*/

const int LED = 6;

namespace globals{
  LiquidCrystal_I2C lcd(0x27, 20, 4);
}

void setup() {
  setupLED();
  setupLCD();  
}

void setupLED() {
  pinMode(LED, OUTPUT);
}

void setupLCD() {
  LiquidCrystal_I2C &lcd = globals::lcd;
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3, 0);
  lcd.print("I'm Blinky!");
  lcd.setCursor(3, 2);
  lcd.print("0 blink(s)");
}

void loop() {
  static int blinkCounter = 0;
  blinkLED(&blinkCounter);
  updateLCD(globals::lcd, blinkCounter);
}

void blinkLED(int *pBlinkCount) {
  digitalWrite(LED, HIGH);
  delay(1000);
  digitalWrite(LED, LOW);
  delay(1000);
  *pBlinkCount = ++(*pBlinkCount);
}

void updateLCD(LiquidCrystal_I2C &lcd, int blinkCounter) {
  lcd.setCursor(3, 2);
  char buffer[16];
  sprintf(buffer, "%d blink(s)", blinkCounter);
  lcd.print(buffer);
}