一个简单用单片机实现继电器控制并具有计数功能，所附的原理图和程序并不配套，但原理基本一致；两个程序，一个是参考程序，另一个是自己编的程序(A simple microcontroller can control the relay and have counting function. The attached schematic diagram and program are not matched, but the principle is basically the same. Two p