uno_shield_lcd_key.ino

/**
 * www.ModuleMore.com
 * ตัวอย่างการใช้งาน Shield LCD พร้อมปุ่มกด
 */ 
#include <Arduino.h>
#include <Wire.h>
#include <LiquidCrystal.h>


const int LCD_RS = 8;
const int LCD_EN = 9;
const int LCD_D0 = 4;
const int LCD_D1 = 5;
const int LCD_D2 = 6;
const int LCD_D3 = 7;
const int BUTTON_INPUT = A0;
// const int LCD_BLACKLIGHT = 10;

LiquidCrystal lcd(LCD_RS, LCD_EN, LCD_D0, LCD_D1, LCD_D2, LCD_D3);
void setup()
{
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);         
  lcd.print("ModuleMore.com"); 
  lcd.setCursor(0, 1);
  lcd.print("Press Key:");
}
void loop()
{
  int val = analogRead(BUTTON_INPUT);  
  lcd.setCursor(10, 1);

  if (val < 60)
  {
    lcd.print("Right ");
  }
  else if (val < 200)
  {
    lcd.print("Up ");
  }
  else if (val < 400)
  {
    lcd.print("Down ");
  }
  else if (val < 600)
  {
    lcd.print("Left ");
  }
  else if (val < 800)
  {
    lcd.print("Select");
  }
}