说明：  采用呼吸阻抗法，来实现人体呼吸波形的采集，单片机采用 ATMEIL1281，具体的项目工程请自己建立，别问我怎么建立一个文件，怎么来应用这个源码
(The use of respiratory impedance method to realize the human respiratory waveform acquisition, single-chip microcomputer used ATMEIL1281, specific projects to establish your own, do not ask me how to build a document, how to use the source code)