Arduino LCD1602 Keypad Shield

Description

This is a 16×2 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");   } }