LCD Keypad Shield

#include <LiquidCrystal.h> // Include library

// Define pin constants
#define RS 8
#define EN 9
#define D4 4
#define D5 5
#define D6 6
#define D7 7

// Create LiquidCrystal object
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);

void setup() {
  lcd.begin(16, 2); // 16 columns, 2 rows

  lcd.setCursor(0, 0); // Set cursor to row 1, column 1
  lcd.print("Hello, world!"); // Print "Hello, World!"
}

void loop() {}

#include <LiquidCrystal.h> // Include library

// Define pin constants
#define RS 8
#define EN 9
#define D4 4
#define D5 5
#define D6 6
#define D7 7

#define BKLIGHT 10 // Backlight pin

// Create LiquidCrystal object
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);

void setup() {
  pinMode(BKLIGHT, OUTPUT); // Set D10 to output

  lcd.begin(16, 2); // 16 columns, 2 rows

  lcd.setCursor(0, 0); // Set cursor to row 1, column 1
  lcd.print("Hello, world!"); // Print "Hello, World!"
}

void loop() {
  // Toggle the backlight every 5 seconds
  digitalWrite(BKLIGHT, HIGH);
  delay(5000);
  digitalWrite(BKLIGHT, LOW);
  delay(5000);
}

#include <LiquidCrystal.h> // Include library

// Define LCD pins
#define RS 8
#define EN 9
#define D4 4
#define D5 5
#define D6 6
#define D7 7

// Define analog input pin
#define ANALOG_PIN A0

// Create LiquidCrystal object
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);

void setup() {}

void loop() {
  // Read the analog pin
  String buttonPressed = "none  ";
  int reading = analogRead(ANALOG_PIN);

  // Interpret the reading based on the value
  // Add spaces at the end of each word to clear the text from the previous longer word.
  if (reading <= 100) {
    buttonPressed = "right ";
  } else if (reading > 100 && reading <= 200) {
    buttonPressed = "up    ";
  } else if (reading > 200 && reading <= 400) {
    buttonPressed = "down  ";
  } else if (reading > 400 && reading <= 600) {
    buttonPressed = "left  ";
  } else if (reading > 600 && reading <= 800) {
    buttonPressed = "select";
  }

  // Show the button pressed
  lcd.setCursor(0, 0);
  lcd.print(buttonPressed);

  delay(2); // Let the ADC settle
}