Interfacing LCD 16*2 with Arduino

                          16x2 LCD Display

The LCD (Liquid Crystal Display) a  16x2 means it can display 16 characters per line and there are 2 such lines, in his LCD each character is displayed in a 5x7 pixel matrix.

A  register select (RS) pin that controls were in the LCDs memory you're writing data to

A  Read/Write (R/W) pin that selects reading mode or writing mode 

An Enable pin that enables writing to the registers 

8 data pins (D0-D7) . 

The states of these pins (high or low)are the bits that you're writing to a register when you write or the values you're reading when you read 

there is also a display contrast pin (v0), power supply pins (+5v and Gnd ), and LED backlight (+a,-k) pins that you can use to power the LCD, control the display contrast and turn on and off the LED backlight, respectively

the Liquid Crystal Library <LiquidCrystal.h> 

Interfacing 16x2 LCD with Arduino

code  

#include <LiquidCrystal.h> // includes the LiquidCrystal Library 
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);// Creates an LC object. Parameters: (rs, enable, d4, d5, d6, d7) 

void setup() { 
 lcd.begin(16,2); // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display } 
}

void loop() { 
 lcd.print("REDDIX"); // Prints "REDDIX" on the LCD 
 delay(1000); // 3 seconds delay 
 lcd.setCursor(2,1); // Sets the location at which subsequent text written to the LCD will be displayed 
 lcd.print("LCD Tutorial"); 
 delay(2000); 
 lcd.clear(); // Clears the display 
 lcd.blink(); //Displays the blinking LCD cursor 
 delay(500); 
 lcd.setCursor(7,1); 
 delay(500); 
 lcd.noBlink(); // Turns off the blinking LCD cursor 
 lcd.cursor(); // Displays an underscore (line) at the position to which the next character will be written 
 delay(500); 
 lcd.noCursor(); // Hides the LCD cursor 
 lcd.clear(); // Clears the LCD screen 
}

 
#include  // includes the LiquidCrystal Library 
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);// Creates an LC object. Parameters: (rs, enable, d4, d5, d6, d7) 

void setup() { 
 lcd.begin(16,2); // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display } 
}

void loop() { 
 lcd.print("REDDIX"); // Prints "REDDIX" on the LCD 
 delay(1000); // 3 seconds delay 
 lcd.setCursor(2,1); // Sets the location at which subsequent text written to the LCD will be displayed 
 lcd.print("LCD Tutorial"); 
 delay(2000); 
 lcd.clear(); // Clears the display 
 lcd.blink(); //Displays the blinking LCD cursor 
 delay(500); 
 lcd.setCursor(7,1); 
 delay(500); 
 lcd.noBlink(); // Turns off the blinking LCD cursor 
 lcd.cursor(); // Displays an underscore (line) at the position to which the next character will be written 
 delay(500); 
 lcd.noCursor(); // Hides the LCD cursor 
 lcd.clear(); // Clears the LCD screen 
}