关于单片机如何最大限度利用I/O作按键，本方法来自一外国有人，还因此申请了专利-On how to maximize use of microcontroller I/O for buttons

无刷直流电机反电动势过零点检测电路与方法相关专利，很有参考价值-Brushless dc motor counter electromotive force passing zero detection circuit and the method related patents, has a reference value

加水机，专利内容，自己写的专利的51程序，不要用在产品上，会侵权-Water machine, patent content, write their own patent 51 procedures, do not use on the products, will be infringement