这是4x4的键盘扫描程序，已验证且灵敏度很高不加上拉，不是扫描方式，只提取特征码。只要4竖线，4横线。-This is a 4x4 keyboard scanner, a high sensitivity has been verified and do not pull with, rather than scanning only signature extraction. As long as 4 vertical, 4 horizontal.