adding the liquid crystal library

LiquidCrystal_I2C/examples/CustomChars/CustomChars.pde

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+//YWROBOT
+//Compatible with the Arduino IDE 1.0
+//Library version:1.1
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+#if defined(ARDUINO) && ARDUINO >= 100
+#define printByte(args)  write(args);
+#else
+#define printByte(args)  print(args,BYTE);
+#endif
+
+uint8_t bell[8]  = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
+uint8_t note[8]  = {0x2,0x3,0x2,0xe,0x1e,0xc,0x0};
+uint8_t clock[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
+uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
+uint8_t duck[8]  = {0x0,0xc,0x1d,0xf,0xf,0x6,0x0};
+uint8_t check[8] = {0x0,0x1,0x3,0x16,0x1c,0x8,0x0};
+uint8_t cross[8] = {0x0,0x1b,0xe,0x4,0xe,0x1b,0x0};
+uint8_t retarrow[8] = {	0x1,0x1,0x5,0x9,0x1f,0x8,0x4};
+  
+LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
+
+void setup()
+{
+  lcd.init();                      // initialize the lcd 
+  lcd.backlight();
+  
+  lcd.createChar(0, bell);
+  lcd.createChar(1, note);
+  lcd.createChar(2, clock);
+  lcd.createChar(3, heart);
+  lcd.createChar(4, duck);
+  lcd.createChar(5, check);
+  lcd.createChar(6, cross);
+  lcd.createChar(7, retarrow);
+  lcd.home();
+  
+  lcd.print("Hello world...");
+  lcd.setCursor(0, 1);
+  lcd.print(" i ");
+  lcd.printByte(3);
+  lcd.print(" arduinos!");
+  delay(5000);
+  displayKeyCodes();
+  
+}
+
+// display all keycodes
+void displayKeyCodes(void) {
+  uint8_t i = 0;
+  while (1) {
+    lcd.clear();
+    lcd.print("Codes 0x"); lcd.print(i, HEX);
+    lcd.print("-0x"); lcd.print(i+16, HEX);
+    lcd.setCursor(0, 1);
+    for (int j=0; j<16; j++) {
+      lcd.printByte(i+j);
+    }
+    i+=16;
+    
+    delay(4000);
+  }
+}
+
+void loop()
+{
+
+}
+

LiquidCrystal_I2C/examples/HelloWorld/HelloWorld.pde

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+//YWROBOT
+//Compatible with the Arduino IDE 1.0
+//Library version:1.1
+#include <Wire.h> 
+#include <LiquidCrystal_I2C.h>
+
+LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
+
+void setup()
+{
+  lcd.init();                      // initialize the lcd 
+  lcd.init();
+  // Print a message to the LCD.
+  lcd.backlight();
+  lcd.setCursor(3,0);
+  lcd.print("Hello, world!");
+  lcd.setCursor(2,1);
+  lcd.print("Ywrobot Arduino!");
+   lcd.setCursor(0,2);
+  lcd.print("Arduino LCM IIC 2004");
+   lcd.setCursor(2,3);
+  lcd.print("Power By Ec-yuan!");
+}
+
+
+void loop()
+{
+}

LiquidCrystal_I2C/examples/SerialDisplay/SerialDisplay.pde

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+/*
+ * Displays text sent over the serial port (e.g. from the Serial Monitor) on
+ * an attached LCD.
+ * YWROBOT
+ *Compatible with the Arduino IDE 1.0
+ *Library version:1.1
+ */
+#include <Wire.h> 
+#include <LiquidCrystal_I2C.h>
+
+LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
+
+void setup()
+{
+  lcd.init();                      // initialize the lcd 
+  lcd.backlight();
+  Serial.begin(9600);
+}
+
+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());
+    }
+  }
+}