#include <Wire.h>
#include <LiquidCrystal_I2C.h>//通过i2c驱动lcd显示屏的库函数
#include <IRremote.h>//红外遥控库函数

LiquidCrystal_I2C lcd(0x27,16,2);//LCD初始化（地址，行，列）
int IRPin = 3;
#define LCD_COLUMNS 0x27         //宏定义LCD地址 0x27
#define LCD_LINES 4              //

String a = "";                //定义输入字符串
String b = "";                //定义显示字符串
int Cursor = 0;               //Y初始液晶显示屏的显示位置位左上角
int Line = 0;                 //X初始液晶显示屏的显示位置位左上角
int x=512;
int y=512;

//arduino运行时首先先运行setup函数进行初始化
void setup(){
  Serial.begin(9600);         //定义初始串口波特率为9600
  lcd.init();                 //初始化lcd
  lcd.backlight();            //开启lcd背光
  IrReceiver.begin(IRPin);
  pinMode(A0, INPUT);         //指定A0引脚位输入
  pinMode(A1, INPUT);         //指定A1引脚位输入
}


void loop(){
  int y = analogRead(A0);     //设置A0引脚位y轴  VERT
  int x = analogRead(A1);     //设置A1引脚位x轴  HORZ
  if(IrReceiver.decode()){    //接收红外型号有1无0
    translateIR();
    if(a == "-")
    {
      //当a输入位“-”时，把b的字符删去末尾一个重新输入b
      a = "";
      b=b.substring(0,b.length()-1);
      lcd.clear();
      lcd.setCursor(Cursor,Line);
      lcd.print(b);           //重新输出b字符串
    }
    b=b+a;
    lcd.print(a);
    a="";
  }
  PS2Control(x,y);
}
void translateIR(){
  switch(IrReceiver.decodedIRData.command){ //接收遥控输出的信号
    case 104:a="0";break;
    case 48:a="1";break;
    case 24:a="2";break;
    case 122:a="3";break;
    case 16:a="4";break;
    case 56:a="5";break;
    case 90:a="6";break;
    case 66:a="7";break;
    case 74:a="8";break;
    case 82:a="9";break;
    case 152:a="-";break;
    default:
      break;
  }
  IrReceiver.resume();//重置红外信号
}

void PS2Control(int x,int y)
{
  delay(100);//设置延迟
  if(x<350 && Cursor<16-b.length()){lcd.clear();lcd.setCursor(Cursor+=1,Line);lcd.print(b);}
  if(x>650 && Cursor>0){lcd.clear();lcd.setCursor(Cursor-=1,Line);lcd.print(b);}
  if(y<350 && Line==0){lcd.clear();lcd.setCursor(Cursor,Line+=1);lcd.print(b);}
  if(y>650 && Line==1){lcd.clear();lcd.setCursor(Cursor,Line-=1);lcd.print(b);}
}