https://blog.faceutil.com/2017/03/24/%ec%84%a4%ec%b9%98-cd-%eb%a7%8c%eb%93%a4%ea%b8%b0%e3%85%a1infrarecorder%e3%85%a1%eb%ac%b4%ec%84%a4%ec%b9%98%ed%8f%ac%ed%84%b0%eb%b8%94-%e3%81%a4/