Contrast Adjust :
 

 

 

The contrast can be adjusted by the potential-meter displayed in the following picture. 

Please refer the official library : http://arduino.cc/en/Reference/LiquidCrystal

Library Support Functions :

1)  LiquidCrystal()
2)  begin()
3)  clear()
4)  home()
5)  setCursor()
6)  write()
7)  print()
8)  cursor()
9)  noCursor()
10)  blink()
11)  noBlink()
12)  display()
13)  noDisplay()
14)  scrollDisplayLeft()
15)  scrollDisplayRight()
16)  autoscroll()
17)  noAutoscroll()
18)  leftToRight()
19)  rightToLeft()
20)  createChar()


Test Code - 1 :

///Arduino Sample Code
///Last modified on 17th September 2010

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  lcd.init();                      // initialize the lcd
 
  // Print a message to the LCD.
  lcd.backlight();
  //lcd.setCursor(0, 1);
  lcd.print("Hello, world!");
}

void loop()
{
  // when characters arrive over the serial port...
  if (Serial.available()) {
    // wait a bit for the entire message to arrive
    delay(100);
    // clear the screen
    lcd.clear();
    // read all the available characters
    while (Serial.available() > 0) {
      // display each character to the LCD
      lcd.write(Serial.read());
    }
  }
}

Test Code - 2 :

＃i nclude <Wire.h>
＃i nclude <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  lcd.init();                      // initialize the lcd
 
  // Print a message to the LCD.
  lcd.backlight();
  lcd.print("Hello, world!");
}

void loop()
{
}
Test Result :

 

Refer Sample Code （this code is used to display the voltage through 0 analog interface of Arduino） :

#include
#include


LiquidCrystal_I2C lcd(0x27,16,2);  //set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("www.emartee.com");
  lcd.setCursor(0, 1);
  lcd.print("Voltage: ");
  lcd.setCursor(13, 1);
  lcd.print("V");
}
void loop()
{
      int val;
      float temp;
      val=analogRead(0);
      temp=val/4.092;
      val=(int)temp;//
      lcd.setCursor(9, 1);
      lcd.print(0x30+val/100,BYTE); 
      lcd.print(0x30+(val%100)/10,BYTE);
      lcd.print('.');
      lcd.print(0x30+val%10,BYTE);
      delay(100);
}

 

Click to download the LiquidCrystal_I2C Library_1

Click to download the LiquidCrystal_I2C Library_2

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