mini-voltmeter

STM32外扩4*4矩阵键盘，包含原理图及源码。(STM32 extends 4*4 matrix keyboard, including schematic diagram and source code.)

STM32F207 UCOSIII LWIP1.3.2

本次设计的数控直流电阻箱主要由恒定电流源部分、显示部分、键盘部分、电源部分组成。以STM32单片机为核心控制恒流源，恒流源电路由达林顿三极管、高精度运算放大器、采样电阻等组成。通过键盘输入给定值，经D/A转换器将数字信号转换为模拟信号，控制电流。采用电流反馈电路控制精度，经多次调试改进，实现了直流电阻箱的功能。本次设计的数控直流电阻箱较以往的电阻箱相比，其优点在于可操作性强、精度高、体积小、高效节能等优点。适用于作为直流负载的应用场合。(The numerical control DC resistance box designed mainly consists of constant current source part, display part, keyboard part and power supply part. The constant current source is controlled by STM32 single chip microcomputer. The constant current source circuit is composed of Darlington transistor, high precision operational amplifier and sampling resistor. Through the keyboard input a given value, the D/A converter converts the digital signal into analog signal to control the current. The control precision of the current feedback circuit is improved, and the function of the DC resistance box is realized through many debugging improvements. Compared with the conventional resistance box, the designed DC resistance box has the advantages of strong operability, high accuracy, small size, high efficiency and energy saving. It is suitable for application as DC load.)

IEEE14节点模型，PSCAD案例，同步发电机功率60MW，电压等级230kV(IEEE14 node model, PSCAD case, synchronous generator power 60MW, the voltage level of 230kV)

ADE7758三相多功能电能计量 IC 中文手册，美国模拟器件公司(Three-phase Multifunctional Energy Metering IC ADE7758 Chinese Manual, Analog Devices Inc.)

A generic interface for reading a file-like object.

modbus通信程序,可用组态软件的驱动程序开发(modbus communication program, available configuration software driver development)

可控步进电机程序 msp430 tb6560(Controlled stepper motor program msp430 tb6560)

针对RN8209新型电表计量芯片的校表软件，使用DLT645-2007通讯协议(RN8209 for new electricity metering chip calibration software, communications protocols using DLT645-2007)

stm8 例程包含全部外设的c语言程序，可以任意扩展(Stm8 programs contain all peripheral c language programs, which can be expanded arbitrarily)