This is a 16x2 LCD Keypad module for ARDUINO / Arduino Diecimila Duemilanove / FREEDUINO board.
Blue Backlight with white words
Uses 4 Bit Arduino LCD Library
The Modified LCD4Bit library and Schematic will send by email.

GP2D12 ranging code:

#include
LCD4Bit_mod lcd = LCD4Bit_mod(2);
char GP2D12;
char a,b;
char str1[]="Renge:";
char str2[]=" Renge Over ";
char str3[]="cm";
void setup()
{
lcd.init();
lcd.clear();
lcd.printIn("GP2D12 testing...");
}
void loop()
{
GP2D12=read_gp2d12_range(1);
if(GP2D12>80||GP2D12<10)
{
lcd.cursorTo(2,0);
lcd.printIn(str2);
}
else
{
a=0x30+GP2D12/10;
b=0x30+GP2D12%10;
lcd.cursorTo(2, 3);
lcd.printIn(str1);
lcd.print(a);
lcd.print(b);
lcd.printIn(str3);
}
delay(50);
}
float read_gp2d12_range(byte pin)
{
int tmp;
tmp = analogRead(pin);
if (tmp < 3)return -1;
return (6787.0 /((float)tmp - 3.0)) - 4.0;
}

Pin Connections:

Backlit Control

• HIGH = Backlight on
• LOW = Backlight off
• Use PWM signal to control brightness

Pin used:

Please refer to the second image above.

Installing library:

Download and unzipped the library folder, and place it to the Arduino libraries directory. Once the library is correctly installed, the file structcture should look like:

arduino-0010/hardware/libraries/LCD4Bit_mod 
arduino-0010/hardware/libraries/LCD4Bit_mod/LCD4Bit_mod.cpp 
arduino-0010/hardware/libraries/LCD4Bit_mod/LCD4Bit_mod.h 
arduino-0010/hardware/libraries/LCD4Bit_mod/keywords.txt
arduino-0010/hardware/libraries/LCD4Bit_mod/examples 
arduino-0010/hardware/libraries/LCD4Bit_mod/readme.txt

Open the example from file -> Examples -> LDC4Bit_mod -> LCD4Bit_modExample, as shown in the screenshot above (third image).

The example should provide enough information to show you how to work with the LCD and all the 5 buttons.

Schematics download:

• 1602 LCD Shield Schematics

Package Includes

• 1 x Keypad Shield LCD1602