说明：  紫牛科技的指纹模块，他们送的相应的文档和示例程序，我们用了，比较不错，如果没有硬件的话，可以看下他们的协议设计，学习学习。代码我没有改动，送来时就是这样的，有问题自己修改，我们也是自己根据我们的情况修改的。
(Purple cow fingerprint technology module, they are sent to the corresponding documentation and sample programs, we have to compare is true that if there is no hardware, you can facie agreement to their design, learning to learn. I did not change the code, when delivered is one such, has the issue of their own modifications, we are also their own according to our situation changes.)