您好,机械专业初学arduino。下载了您的打包的程序后,arduino可以运行,但是打开串口监视器,里面全是乱码。将您的Processing用软件打开后,提示the size of the sketch could not be determined from your code. Use only numbers (not variables) for the size() command. Read the size() reference for more details.请问是原因造成的,怎么解决。