Lcd Without Potentiometer

1#include <LiquidCrystal.h> //Import the LCD library
2//Include^
3//Init
4LiquidCrystal  lcd(12, 11, 5, 4, 3, 2); /*Initialize the LCD and
5                                        tell  it which pins is
6                                        to be used for communicating*/
7
8
9const  int contrast = 13;
10
11void setup() {
12  analogWrite(contrast, 130);
13  //  put your setup code here, to run once:
14  lcd.begin(16, 2); //Tell the LCD that  it is a 16x2 LCD
15  //pinMode-ing OUTPUT makes the specified pin output power
16}
17
18void  loop() {
19  // put your main code here, to run repeatedly:
20  lcd.print(" Hello,  World!!"); //Output " Hello, World!!" on the first line of the LCD
21  lcd.setCursor(0,  1); /*Set the (invisible) cursor on the first place second row of the LCD.
22                        Cursor  values are 0-indexed, 0 would the be the first place.
23                        The  cursor coordinates are X,Y coordinates.*/
24  lcd.print("16x2 LCD Screen");
25  delay(1000); //Wait a second
26  for (int l = 0; l < 16; l++) { //For loop. Repeating  16 times
27    lcd.scrollDisplayRight(); //Scroll whole screen to the right once
28    delay(90); //Slight delay for animation
29  }
30  delay(1000);
31  for (int  l = 0; l < 16; l++)
32    lcd.scrollDisplayLeft();
33  for (int l = 51; l > -1;  l--) { //Repeating 51 times
34    analogWrite(bri, l * 5);
35    delay(35);
36  }
37  delay(1000);
38  for (int l = 0; l < 51; l++) { //Repeating 51 times
39    analogWrite(contra, l * 5);
40    delay(35);
41  }
42  delay(1000);
43  lcd.setCursor(0,  0);
44}