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介绍几种硬件方式监控RS232通讯口方法。-A few hardware monitor RS232 communication port method.

PM25监测程序-Android空气质量检测仪源代码，一个Android上的手机应用源码，主要用来监测空气质量，也就是大家熟悉的PM2.5值监测，这需要相应的手机硬件支持，Java代码完整，仅供参考-PM25 air quality monitoring program-Android source code detector, a mobile application on the Android source code, mainly used to monitor air quality,