#include <LiquidCrystal_I2C.h>
#include<IRremote.h>
#include <string.h>

LiquidCrystal_I2C lcd(0x27,16,2);
int IRPin = 3;
String a = "";
String b = "";

void setup(){
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  IrReceiver.begin(IRPin);
}
void loop(){
  if(IrReceiver.decode()){
    translateIR();
    lcd.print(b+a);
  }
}
void translateIR(){
  switch(IrReceiver.decodedIRData.command){
    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 176:
      a="";
      lcd.clear();
      break;
    default:
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("other button!");
      lcd.setCursor(0,1);
      lcd.print("button code:");
      lcd.print(IrReceiver.decodedIRData.command);
  }
  IrReceiver.resume();
}