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  /*
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  LiquidCrystal Library - TextDirection
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 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
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 library works with all LCD displays that are compatible with the 
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 Hitachi HD44780 driver. There are many of them out there, and you
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 can usually tell them by the 16-pin interface.
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 This sketch demonstrates how to use leftToRight() and rightToLeft()
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 to move the cursor.
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 The circuit:
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 * LCD RS pin to digital pin 12
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 * LCD Enable pin to digital pin 11
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 * LCD D4 pin to digital pin 5
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 * LCD D5 pin to digital pin 4
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 * LCD D6 pin to digital pin 3
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 * LCD D7 pin to digital pin 2
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 * LCD R/W pin to ground
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 * 10K resistor:
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 * ends to +5V and ground
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 * wiper to LCD VO pin (pin 3)
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 Library originally added 18 Apr 2008
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 by David A. Mellis
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 library modified 5 Jul 2009
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 by Limor Fried (http://www.ladyada.net)
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 example added 9 Jul 2009
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 by Tom Igoe 
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 modified 22 Nov 2010
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 by Tom Igoe
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 This example code is in the public domain.
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 http://www.arduino.cc/en/Tutorial/LiquidCrystal
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 */
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// include the library code:
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#include <LiquidCrystal.h>
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// initialize the library with the numbers of the interface pins
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LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
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int thisChar = 'a';
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void setup() {
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  // set up the LCD's number of columns and rows: 
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  lcd.begin(16, 2);
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  // turn on the cursor:
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  lcd.cursor();
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  Serial.begin(9600);
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}
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void loop() {
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  // reverse directions at 'm':
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  if (thisChar == 'm') {
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    // go right for the next letter
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    lcd.rightToLeft(); 
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  }
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  // reverse again at 's':
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  if (thisChar == 's') {
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    // go left for the next letter
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    lcd.leftToRight(); 
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  }
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  // reset at 'z':
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  if (thisChar > 'z') {
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    // go to (0,0):
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    lcd.home(); 
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    // start again at 0
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    thisChar = 'a';
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  }
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  // print the character
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  lcd.write(thisChar);
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  // wait a second:
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  delay(1000);
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  // increment the letter:
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  thisChar++;
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}
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