#include <LiquidCrystal_I2C.h>
#include <IRremote.h>
LiquidCrystal_I2 lcd(0x27, 20, 4);
#define PIN_RECEIVER 2 // Signal Pin of IR receiver
IRrecv receiver(PIN_RECEIVER);
int state=0,buzzer=8;
int a[8]={0};
int j=0, terminal=0;

void setup()
{
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("aaaa");
  pinMode(buzzer, OUTPUT);
  receiver.enableIRIn(); // Start the receiver
  Serial.begin(9600);
}
void loop()
{
// Checks received an IR signal
  if (receiver.decode()) 
  {
    if (terminal) //重新开始
    {
      terminal = 0;
      //清屏
      for(int i=j; i>=0; i--)
      {
        lcd.setCursor(i,1);
        lcd.print(" ");
      }
      j=0;
    }
    a[j] = receiver.decodedIRData.command;//解码值
    Serial.println(a[j]);
    lcd.setCursor(j,1);
    if (a[j] == 82)   //9--play
    {
        terminal=1; //终止操作
        //清屏
        for(int i=j; i>=0; i--)
        {
          lcd.setCursor(i,1);
          lcd.print(" ");
        }
        //显示所有字符和发声
        for(int i=0; i<j; i++)
        {
          lcd.setCursor(i,1);
          voice(a[i]);
        }
    }
    else
    {
      voice(a[j]);    //显示字符和发声
    }
    if (!terminal)
    {
      j++;
      if (j >= 8)
      {
        terminal=1; //终止操作
        //清屏
        for(int i=8; i>=0; i--)
        {
          lcd.setCursor(i,1);
          lcd.print(" ");
        }
        //显示所有字符和发声
        for(int i=0; i<8; i++)
        {
          lcd.setCursor(i,1);
          voice(a[i]);
        }
      }
    }
    receiver.resume(); // Receive the next value
  }
}
    
void mytone(int tonePin,int frequency, int duration)
{
  pinMode(tonePin,OUTPUT);
  int period = 1000000 / frequency;
  int pulse = period / 2;
  for (long i = 0; i < duration; i += 10)
  {
    digitalWrite(tonePin, HIGH);
    delayMicroseconds(pulse);
    digitalWrite(tonePin, LOW);
    delayMicroseconds(pulse);
  }
}
int voice(int toneVioce)
{
  switch(toneVioce)
  {
	  case 162:   //power key        
        mytone(buzzer,596,200);
        noTone(buzzer);        
        lcd.print("&");        
        break;   
    case 48:
      mytone(buzzer,262,200);
      noTone(buzzer);
      lcd.print("1");
      break;
	  case 24:
      mytone(buzzer,294,200);
      noTone(buzzer);
      lcd.print("2");
	    break;
	  case 122:
      mytone(buzzer,330,200);
      noTone(buzzer);
      lcd.print("3");
	    break;
	  case 16:
      mytone(buzzer,349,200);
      noTone(buzzer);
      lcd.print("4");
	    break;
	  case 56:
      mytone(buzzer,392,200);
      noTone(buzzer);
      lcd.print("5");
	    break;
	  case 90:
      mytone(buzzer,440,200);
      noTone(buzzer);
      lcd.print("6");
	    break;
	  case 66:
      mytone(buzzer,494,200);
      noTone(buzzer);
      lcd.print("7");
	    break;
	  default:
	    break;
  }
}