示例九、红外接收模块

//Arduino C demo

IRrecv irrecv(4);
decode_results results;
unsigned long key;
unsigned long ir_value;

void IR_key() {
  static double ir_LastTime;
  if (irrecv.decode(&results)) {
    ir_LastTime = millis();
    ir_value = results.value;
    if (results.value != 0xFFFFFFFF) {
      key = results.value;
    }
    irrecv.resume();
  } else if ((millis() - ir_LastTime) >= 180) {
    key = 0;
  }
  else
    ir_value = 0;
}

void setup() {
  irrecv.enableIRIn();
  pinMode(5, OUTPUT);
}

void loop() {
  IR_key();
  if (key == 0xFFA857) {
    digitalWrite(5, 1);
  }
  key = 0;
}