// For: https://forum.arduino.cc/t/millis-code-still-freezing-the-lcd-display/1069629/
// This is only a short test.
// See the official example for explanation: 
//   https://github.com/duinoWitchery/hd44780/blob/master/examples/ioClass/hd44780_I2Cexp/HelloWorld/HelloWorld.ino
//
 
#include <Wire.h>
#include <hd44780.h>
#include <hd44780ioClass/hd44780_I2Cexp.h>

hd44780_I2Cexp lcd;

// LCD geometry
const int LCD_COLS = 16;
const int LCD_ROWS = 2;

void setup()
{
  Serial.begin(115200);
  Wire.begin();

  int status = lcd.begin(LCD_COLS, LCD_ROWS); // also turn on backlight
	if(status) // non zero status means it was unsuccesful
	{
    Serial.println("Display was not found");
	}

  lcd.setCursor(0, 0);      // column, row
  lcd.print( "Hello");
  delay(1000);
  lcd.clear();
  lcd.print( "hd44780");
  delay(1000);
}

void loop()
{
  // The cheap LCD displays can not dim the backlight,
  // therefor the functions backlight() and noBacklight()
  // are used instead of the setBacklight().
  lcd.backlight();      // turn backlight on.
  delay(1000);
  lcd.noBacklight();    // turn backlight off.
  delay(1000);
  lcd.setCursor(0, 1);    // column, row
  lcd.print( millis() / 1000UL);
}