apuntes_Arduino/lcd/i2c/i2c_20x4/i2c_20x4.ino

#include <LiquidCrystal_I2C.h>
/* Pines del chip I2C al Arduino:
    / VCC -> +5V /
    / GND -> GND / 
    / SDA -> A4  /
    / SCL -> A5 */
    
// Pins chip I2C a LCD(addr,en,rw,rs,d4,d5,d6,d7,BackLight, BLstatus) 
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);// Set the LCD I2C address [0x27 o 0x3F]

void setup() {
    //pinMode(BACKLIGHT_PIN, OUTPUT );
    lcd.begin(20,4);               // initialize the lcd 
    //digitalWrite(BACKLIGHT_PIN, HIGH );
}

void loop() {
    lcd.clear();
    lcd.home();//
    lcd.print("Sainsmart docs????");  
    delay(1000);
    lcd.setCursor(0, 1);// go to the next line
    lcd.print("just Googleit");
    delay(1000);
    lcd.setCursor(0, 2);// next line
    lcd.print("    funciona !!!!");
    delay(500);
    lcd.setCursor(0, 3);
    lcd.print("        XD!      ");
    delay(1000);
    lcd.clear();
}