How to program a LCD display

1
2//www.elegoo.com
3//2016.12.9
4
5/*
6  LiquidCrystal Library  - Hello World
7
8 Demonstrates the use of a 16x2 LCD display.  The LiquidCrystal
9  library works with all LCD displays that are compatible with the
10 Hitachi HD44780  driver. There are many of them out there, and you
11 can usually tell them by the  16-pin interface.
12
13 This sketch prints "Hello World!" to the LCD
14 and  shows the time.
15
16  The circuit:
17 * LCD RS pin to digital pin 7
18 * LCD  Enable pin to digital pin 8
19 * LCD D4 pin to digital pin 9
20 * LCD D5 pin to  digital pin 10
21 * LCD D6 pin to digital pin 11
22 * LCD D7 pin to digital pin  12
23 * LCD R/W pin to ground
24 * LCD VSS pin to ground
25 * LCD VCC pin to  5V
26 * 10K resistor:
27 * ends to +5V and ground
28 * wiper to LCD VO pin (pin  3)
29
30 Library originally added 18 Apr 2008
31 by David A. Mellis
32 Library  modified 5 Jul 2009
33 by Limor Fried (http://www.ladyada.net)d
34 Modified 22  Nov 2010
35 by Tom Igoe
36
37 This example code is in the public domain.
38
39  http://www.arduino.cc/en/Tutorial/LiquidCrystal
40 */
41
42// include the library  code:
43#include <LiquidCrystal.h>
44
45// initialize the library with the numbers  of the interface pins
46LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
47
48void setup()  {
49  // set up the LCD's number of columns and rows:
50  lcd.begin(16, 2);
51  // Print a message to the LCD.
52  lcd.print("Hello World");
53}
54
55void  loop() {
56  // set the cursor to column 0, line 1
57  // (note: line 1 is the  second row, since counting begins with 0):
58  lcd.setCursor(0, 1);
59  // print  the number of seconds since reset:
60  lcd.print(millis() / 1000);
61}
62