Ejemplos > Librarías > LiquidCrystal

LiquidCrystal - Dirección del texto (leftToRight() y rightToLeft()

La librería LiquidCrystal te permite controlar displays LCD que sean complatibles con el driver Hitachi HD44780. Hay muchos de ellos ahí fuera, y puedes comunicarte con ellos a través del interfaz de 16 pines.

Este sketch de ejemplo muestra cómo usar los métodos leftToRight() y rightToLeft(). Estos métodos controlan en qué dirección fluye el texto desde el cursor.

rightToLeft() hace que el texto fluya desde la izquierda del cursor, como si el display estuviese justificado a la derecha.

leftToRight() chace que el texto fluya desde la derecha del cursor, como si el display estuviese justificado a la izquierda.

Este sketch imprime a a través de l de derecha a izquierda, después s a través de z de derecha a izquierda de nuevo.

 (:includeurl http://arduino.googlecode.com/svn/trunk/libraries/LiquidCrystal/examples/TextDirection/TextDirection.pde border=0:)

This sketch prints a through l right to left, then m theough r left to right, then s through z right to left again.

This sketch prints a through l right to left, then @m@ theough r left to right, then s through z right to left again.

Examples > Libraries > LiquidCrystal

LiquidCrystal - Text Direction (leftToRight() and rightToLeft()

The LiquidCrystal library allows you to control LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface.

This example sketch shows how to use the leftToRight() and rightToLeft() methods. These methods control which way text flows from the cursor.

rightToLeft() causes text to flow to the left from the cursor, as if the display is right-justified.

leftToRight() causes text to flow to the right from the cursor, as if the display is left-justified.

This sketch prints @a@ through @l@ right to left, then @m@ theough @r@ left to right, then @s@ through @z right to left again.

(:include LiquidCrystalCircuit :)

Code

   LiquidCrystal Library - TextDirection

  This sketch demonstrates how to use leftToRight() and rightToLeft()
  to move the cursor.

 int thisChar = 'a';

   // turn on the cursor:
   lcd.cursor();
   Serial.begin(9600);

   // reverse directions at 'm':
   if (thisChar == 'm') {
     // go right for the next letter
     lcd.rightToLeft(); 
   }
   // reverse again at 's':
   if (thisChar == 's') {
     // go left for the next letter
     lcd.leftToRight(); 
   }
   // reset at 'z':
   if (thisChar > 'z') {
     // go to (0,0):
     lcd.home(); 
     // start again at 0
     thisChar = 'a';
   }
   // print the character
   lcd.print(thisChar, BYTE);
   // wait a second:
   delay(1000);
   // increment the letter:
   thisChar++;

(:div class=code :)

 /*
   LiquidCrystal Library - display() and noDisplay()
  
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
  library works with all LCD displays that are compatible with the 
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
  
  This sketch prints "Hello World!" to the LCD and uses the 
  display() and noDisplay() functions to turn on and off
  the display.
  
  The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
  * LCD D4 pin to digital pin 5
  * LCD D5 pin to digital pin 4
  * LCD D6 pin to digital pin 3
  * LCD D7 pin to digital pin 2
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
  
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
  by Tom Igoe 
  modified 25 July 2009
  by David A. Mellis

  
  http://www.arduino.cc/en/Tutorial/LiquidCrystal
  */

 // include the library code:
 #include <LiquidCrystal.h>

 // initialize the library with the numbers of the interface pins
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

 void setup() {
   // set up the LCD's number of rows and columns: 
   lcd.begin(16, 2);
   // Print a message to the LCD.
   lcd.print("hello, world!");
 }

 void loop() {
   // Turn off the display:
   lcd.noDisplay();
   delay(500);
    // Turn on the display:
   lcd.display();
   delay(500);
 }

(:divend:)