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

const byte lcd1Addr = 0x3F;  // direccion i2c del display 1, ver en LCD
const byte lcd2Addr = 0x27;  // direccion i2c del display 2, ver en LCD

LiquidCrystal_I2C lcd1(lcd1Addr, 16, 2); 
LiquidCrystal_I2C lcd2(lcd2Addr, 16, 2);

unsigned long t0;

void setup() {
// iniciar los LCD
  lcd1.init();
  lcd2.init();
// encender la iluminacion de los LCD
  lcd1.backlight();
  lcd2.backlight();

  lcd1.print("Hello World! <1>");
  lcd2.print("Hola Mundo!  <2>");

  t0 = millis();
}

void loop() {
  unsigned long secs = (millis() - t0) / 1000;

  lcd1.setCursor(0, 1);
  lcd1.print(secs);
  lcd1.print(" Seconds");

  lcd2.setCursor(0, 1);
  lcd2.print(secs);
  lcd2.print(" Segundos");
  
  delay(100);
}