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,* thank these selfless dedication Friend
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