#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

unsigned long millisAnteriorLCD = 0;
unsigned long millisAnteriorScroll = 0;

int LCD = 0;
int scroll = 0;

void setup() {
  lcd.init();
  lcd.setBacklight(HIGH);

  Serial.begin(9600);
}

void loop() {
  unsigned long millisAtual = millis();
  
  if ((millisAtual - millisAnteriorLCD) >= 2000) {
    millisAnteriorLCD = millisAtual;

    if (LCD == 0) {
      lcd.setCursor(5, 0);
      lcd.print("WELCOME");
      lcd.setCursor(4, 1);
      lcd.print("ROBOTICS");

      Serial.println("WELCOME");
      Serial.println("ROBOTICS");
      Serial.println("");

      LCD = 1;
    } 
    else if (LCD == 1) {
      lcd.clear();
      lcd.setCursor(16, 0);
      lcd.print("JOHN SMITH TECH");
      lcd.setCursor(16, 1);
      lcd.print("JANE DOE LABS");

      Serial.println("JOHN SMITH TECH");
      Serial.println("JANE DOE LABS");
      Serial.println("");

      LCD = 2;
    }
  }

  if (LCD == 2 && (millisAtual - millisAnteriorScroll) >= 250) {
    millisAnteriorScroll = millisAtual;

    lcd.scrollDisplayLeft();
    scroll++;

    if (scroll == 36) {
      LCD = 0;
      scroll = 0;
      lcd.clear();
    }
  }
}