通过基于stc89c51的单片机rc电路测量湿敏电阻以测得湿度，含Proteus仿真文件及c51程序，同时相较于上次，提供了三种计时方案。-The measured humidity measured based of the microcontroller stc89c51 rc circuit hygristor, with Proteus simulation file and c51 program, while compared to the last three timing.