主要实现电压电流的采集与转换，将380v变为5v,实现市电与计算机的连接-The main realization of the voltage current acquisition and conversion, convert 380v to 5v, and realize the connection between city electric and computer

电路的连接图，程序都有注释，仿真平台protues，适合初学的人(The connection diagram of the circuit, the program has the annotation, the simulation platform Protues, suitable for the first student)

STM32的JTAG / SWD接口是通过20PIN连接线连接目标板，所以ST-LINK/V2连接至STM32目标板时需要注意连接方向(The JTAG / SWD interface of STM32 connects the target board through the 20PIN connection line, so the connection direction needs to be noticed when ST-LINK/V2 is connected to the STM

很多场合需要增加电源反接保护，该文档列出针对小功率的反接保护，成本低廉(Many occasions need to increase the power reverse connection protection. The document lists the low power reverse connection protection, and the cost is low.)