LCD en Arduino UNO con módulo I2C (4 patitas)

i2c_scanner.ino

/*
  0. Probar conexión

  Módulo I2C para LCD -> Arduino
  - GND -> GND
  - VCC -> 5V
  - SDA -> A4
  - SCL -> A5
  
  Fuente original https://create.arduino.cc/projecthub/akshayjoseph666/interface-i2c-16x2-lcd-with-arduino-uno-just-4-wires-273b24
*/

#include <Wire.h>

void i2c_setup() {
  Wire.begin();
  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
}

void i2c_loop() {
  byte error, address;
  int devices;

  Serial.println("Buscando...");
  devices = 0;

  for (address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0) {
      Serial.print("I2C encontrado en 0x");
      if (address < 16) Serial.print("0");
      Serial.print(address, HEX);
      Serial.println(":-D");
      devices++;      
    } else if (error == 4) {
      Serial.print("Error desconocido en 0x");
      if (address < 16) Serial.print("0");
      Serial.print(address, HEX);
      Serial.println(":-(");
    }
  }

  Serial.print(devices);
  Serial.println(" dispositivos encontrados.\n\n");
  delay(5000);
}

lcd_prueba.ino

/*
  Probar LCD:
  - Instalar "liquidcrystal i2c" desde Library Manager en IDE

  Fuente original https://create.arduino.cc/projecthub/akshayjoseph666/interface-i2c-16x2-lcd-with-arduino-uno-just-4-wires-273b24
*/

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

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
}

void loop() {
  lcd.clear();
  lcd.setCursor(2, 0);
  lcd.print("Hola");
  Serial.println("Hola");
  delay(500);

  lcd.clear();
  lcd.setCursor(7, 1);
  lcd.print("tierra!");
  Serial.println("tierra!");
  delay(500);
}