Infrared receiver sketch for Arduino

IRrecv.ino

#include <IRremote.h>

#define IR_REPEAT 0xFFFFFFFF

const int RECV_PIN = 2;

IRrecv irrecv(RECV_PIN);
decode_results results;
unsigned int latest_value = 0;

void setup(){
  Serial.begin(9600);
  irrecv.enableIRIn();
  irrecv.blink13(true);
}

void loop(){
  if (irrecv.decode(&results)){
    if (results.value && results.value != IR_REPEAT && results.value != latest_value) {
      Serial.print("{\"ir\":");
      Serial.print(results.value, HEX);
      Serial.println("}");
    }

    latest_value = results.value;
    irrecv.resume();
  }
}