A simple Arduino Sketch to control the LCD Keypad Shield (SKU: DFR0009)

ArduinoLcdKeypadControl.ino

// Use LiquidCrystal library
#include <LiquidCrystal.h>

// Define button values
#define btnNONE   0
#define btnRIGHT  1
#define btnUP     2
#define btnDOWN   3
#define btnLEFT   4
#define btnSELECT 5

// Select the pins used on the LCD panel
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Define variable for selected key
int lcdKey = 0;

// Function to read in keys
int readLcdButtons() {

  // Read the analog key value
  int keyIn = analogRead(0);

  // Match the value with the according buttons
  if (keyIn > 1000) return btnNONE;
  if (keyIn < 50)   return btnRIGHT;  
  if (keyIn < 250)  return btnUP; 
  if (keyIn < 450)  return btnDOWN; 
  if (keyIn < 650)  return btnLEFT; 
  if (keyIn < 850)  return btnSELECT;  

  // Return 'none' if no match was found
  return btnNONE;
}

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
}

void loop() {

  // Reset the cursor
  lcd.setCursor(0,0);  
  
  // Read the button value
  lcdKey = readLcdButtons();

  // Depending on which button was pushed, perform an action
  switch (lcdKey)
  {
    case btnRIGHT:
    {
      lcd.print("RIGHT ");
      break;
    }
    case btnLEFT:
    {
      lcd.print("LEFT   ");
      break;
    }
    case btnUP:
    {
      lcd.print("UP    ");
      break;
    }
    case btnDOWN:
    {
      lcd.print("DOWN  ");
      break;
    }
    case btnSELECT:
    {
      lcd.print("SELECT");
      break;
    }
    case btnNONE:
    {
      lcd.print("NONE  ");
      break;
    }
  }
}