Carrier signal sending simple RF

gistfile1.ino

const byte CARRIER=B10101010,PRE=0x5E,ADDR=0x10;
const byte START = 0xD0;
const byte STOP = 0xDF;

static void sendKeyState(){
  if(stateChanged){
    sendPackage(START);

    for(int i = 0; i < pressedKeyIndex; i++){
      sendPackage(pressedKeys[i]->id);
    }
    sendPackage(STOP);
  }
  else {
    if(millis() - lastKeepAlive > 5){
      Serial.write(CARRIER);
      lastKeepAlive = millis();
    }
  }
}

static void sendPackage(byte data){
  Serial.write(PRE);
  Serial.write(ADDR);
  Serial.write(data);
  Serial.write(ADDR + data);
}