Arduino虽然是单线程的单片机，但是也有方法实现多线程，此库文件可以方便的调用建立虚拟线程实现单片机的多线程编程(Although Arduino is a single threaded microcontroller, but there are ways to achieve multi-threaded, this library file can be easily called, the establishment of

对一些保密函数进行封装，已进行测试 通过。用libtest封装一个延时函数，在lib中直接调用就行。(Encapsulation of some secret functions has been tested. A delay function is encapsulated in libtest, and it is called directly in lib.)