| /* | |
| LiquidCrystal Library - TextDirection | |
| 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 demonstrates how to use leftToRight() and rightToLeft() | |
| to move the cursor. | |
| 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 | |
| * LCD R/W pin to ground | |
| * 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 22 Nov 2010 | |
| by Tom Igoe | |
| modified 7 Nov 2016 | |
| by Arturo Guadalupi | |
| This example code is in the public domain. | |
| http://www.arduino.cc/en/Tutorial/LiquidCrystalTextDirection | |
| */ | |
| // include the library code: | |
| // initialize the library by associating any needed LCD interface pin | |
| // with the arduino pin number it is connected to | |
| const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; | |
| LiquidCrystal lcd(rs, en, d4, d5, d6, d7); | |
| int thisChar = 'a'; | |
| void setup() { | |
| // set up the LCD's number of columns and rows: | |
| lcd.begin(16, 2); | |
| // turn on the cursor: | |
| lcd.cursor(); | |
| } | |
| void loop() { | |
| // 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.write(thisChar); | |
| // wait a second: | |
| delay(1000); | |
| // increment the letter: | |
| thisChar++; | |
| } | |