Arduino LCD Keypad Shield

Arduino LCD Keypad Shield

This is a 16x2 LCD and Keypad shield for Arduino Uno, Diecimila, Duemilanove and Freeduino boards.

• Blue Backlight 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:

LiquidCrystal 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. Reading the buttons is easy and example code is shown below

Pin Connections

Note: Do not use pin Digital 10 when this board is plugged in (see here for more details)

The board is a little bigger than an Arduino UNO (measuring 8cm x 6cm). This can be seen in the images.

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.setCursor(0,0);
  lcd.print("LCD Key Shield");
  lcd.setCursor(0,1);
  lcd.print("Press Key:");
}

void loop() {
  int x;
  x = analogRead (0);
  lcd.setCursor(10,1);
  if (x < 60) {
    lcd.print ("Right ");
  }
  else if (x < 200) {
    lcd.print ("Up    ");
  }
  else if (x < 400){
    lcd.print ("Down  ");
  }
  else if (x < 600){
    lcd.print ("Left  ");
  }
  else if (x < 800){
    lcd.print ("Select");
  }
}