Hi, I have seen the post before my question just now but the biggest problem is that my modified version .h file was unable to load into my program, so I can't reduce the used space since it exceeds the memory of the nyboard.......

Hi bro, i have redone everything based on ur recommendation, but i cant figure out the problem since i believed that the IRremote library might have been changed recently.....thanks for trying to help me : )

@Dobromir Hi I was stucked at the stage when I wanted to upload the OpenCat.ino to bittle, I can upload the code but the serial monitor said that the irrecv.decode(& results) was deprecated and may not work as expected,so I couldn't do the leg calibration of bittle, and so I can't install the legs yet.