The arduino LCD Keypad shield is developed for Arduino compatible boards, to provide a user-friendly interface that allows users to go through the menu, make selections etc. It consists of a 1602 white character blue backlight LCD. The keypad consists of 5 keys — select, up, right, down and left. To save the digital IO pins, the keypad interface uses only one ADC channel. The key value is read through a 5 stage voltage divider.
Analog 0 Button (select, up, right, down and left)
Digital 4 DB4
Digital 5 DB5
Digital 6 DB6
Digital 7 DB7
Digital 8 RS (Data or Signal Display Selection)
Digital 9 Enable
Digital 10 Backlit Control
Arduino LCD Keypad Shield
This is a 16×2 LCD and Keypad shield for Arduino Uno, Diecimila, Duemilanove, Freeduino boards, and other Uno sized compatible boards such as the Sparkfun Redboard.
Blue Back light with white words
uses 4 Bit Arduino LCD Library
Left, Right, Up, Down and Select buttons
Screen contrast adjustment
Arduino Reset button
The board uses different pins to the Arduino example sketches, so to make the display work, use the following sequence of pins when starting the library:
Liquid Crystal lcd(8,9,4,5,6,7);
The buttons are connected to only one analog input pin through resistors to give a different voltage for each button, thus saving on input/output pins.