Arduino – LCD interfacing

LCD is a type of display device that can display all the letters of alphabet, Greek letters, punctuation marks, mathematical symbols etc. HD44780 microcontroller (Hitachi) and can display messages in two lines with 16 characters each. It is also possible to display symbols made up by the user. Other useful features include automatic message shift (left and right), cursor appearance, LED backlight etc.The LCD can be connected in two ways ,one is 4 bit mode and other is 8 bit mode .Arduino has defined a special library for LCD which can be viewed on
http://learningembedded.com/arduino/arduino-lcd-interfacing/