I2C LCD1602: find its address, then say hello, on an Arduino Uno

// An I2C LCD1602: find it on the bus, then write to it.
//
//   LCD backpack GND -> GND   VCC -> 5V   SDA -> A4   SCL -> A5
//
// I2C is a two-wire bus: every device on it answers to its own address. The
// scan below calls each address from 1 to 126 and lists the ones that answer.
// This backpack answers at 0x27 (some answer at 0x3F, and then the line
// creating the display needs that number instead).

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

LiquidCrystal_I2C lcd(0x27, 16, 2);

void scan() {
  int found = 0;
  for (byte address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    if (Wire.endTransmission() == 0) {
      Serial.print("I2C device found at 0x");
      if (address < 16) Serial.print("0");
      Serial.println(address, HEX);
      found++;
    }
  }
  if (found == 0) Serial.println("No I2C devices found");
}

void setup() {
  Serial.begin(9600);
  Serial.println("Mokxi Uno: scanning the I2C bus on A4 and A5");
  Wire.begin();
  scan();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Hello, inventor!");
}

void loop() {
  lcd.setCursor(0, 1);
  lcd.print("Seconds: ");
  lcd.print(millis() / 1000);
  delay(250);
}