#include <IRremote.h>
const int receiver = 5;
IRrecv irrecv(receiver);
decode_results results;

const byte releuPin = 6;
volatile byte stat = 0;
const int buzzerPin = 4;

void setup()
{ irrecv.enableIRIn();
  pinMode(releuPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void playTone(int tone, int duration) {
 for (long i = 0; i < duration * 1000L; i += tone * 2) {
 digitalWrite(buzzerPin, HIGH);
 delayMicroseconds(tone);
 digitalWrite(buzzerPin, LOW);
 delayMicroseconds(tone);
 }
}

void loop() {
  if (stat) {
    digitalWrite(releuPin, HIGH);
    delay(1000);
    digitalWrite(releuPin, LOW);
    delay(1000);
  }
  if (irrecv.decode(&results))
  {
    if (results.value == 0x20DF807F)

      digitalWrite(releuPin, HIGH);

    else

    if(results.value == 0x20DF609F)

       playTone(2000, 500);

    else

    if(results.value == 0x20DF906F)

      digitalWrite(releuPin, LOW);

    else
    if(results.value == 0x20DF50AF)
    {
      digitalWrite(releuPin, HIGH);
      playTone(2000, 500);
    }
    else if(results.value == 0x20DFD02F)
    {
      digitalWrite(releuPin, LOW);
      playTone(2000, 500);
    }
    irrecv.resume(); // receive the next value
  }
}