关于proteus的仿真实例，很不错的，包括流水灯、步进电机等等。,About Proteus simulation examples, very good, including the water lamps, stepper motor and so on.

PID水量控制仿真演示系统-Delphi源代码及EXE.rar-PID control simulation shows the system of water-Delphi source code and EXE.rar