4×4矩阵式键盘识别技术 * 注：为了有更多实用的实验程序供大家学习，部分程序参考网上的资源， * 在此谢谢这些无私奉献的朋友-4 × 4 matrix keyboard recognition technology* Note: in order to have more practical experimental procedures for everyone to learn some of the procedures refer to online resources,*