remote.ino

#include <IRremote.h>

const int RECV_PIN = 7, LED_PIN = 3;

IRrecv irrecv(RECV_PIN);
decode_results results;
unsigned long key_value = 0;

void setup() {
  Serial.begin(9600);
  irrecv.enableIRIn();
  irrecv.blink13(true);
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  if (irrecv.decode(&results)) {

    if (results.value == 0XFFFFFFFF)
      results.value = key_value;

    switch (results.value) {
      case 0xFFA857:
        // minus
        if (Serial) Serial.println("-");
        digitalWrite(LED_PIN, LOW);
        break;
      case 0xFF906F:
        // plus
        if (Serial) Serial.println("+");
        digitalWrite(LED_PIN, HIGH);
        break;
    }
    key_value = results.value;
    irrecv.resume();
  }
}