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介绍如何简单可靠而方便测量 4～20mA 信号的文章。许多仪器仪表在远距离传送信号时，都有可能采取 4～20mA 的方式进行传送。本文对使用运算放大器或者不用运算放大器的场合都有介绍。给出了接口电阻的计算方法以及调整4mA＝零点，20mA＝满度的详细说明。并附有局部连接的原理图。(How simple, reliable and convenient measurement of 4 ~ 20mA signal article. Many instruments in the long-distance signal transmission, may take 4 ~ 20mA way transmission. In this paper, an operational amplifier or op amp do not have a description occasions. Shows the calculation of the interface resistance and adjust the 4mA = zero, 20mA = full scale details. Local connections together with the schematic.)

对舵机的调试功能，通过多个舵机完成整个机器人的拼凑，进而完成机器人跳舞的任务。(The debugging function of the steering gear completes the assembly of the whole robot through multiple steering gear, and then completes the task of robot dancing.)

The SC-2075 is a desktop signal conditioner that you can connect directly to National Instruments E Series or 1200 Series devices. The SC-2075 has the following features: • Binding posts – Three for ±15 V outputs – Two for 0 to 5 V outputs – Two for measuring analog signals or DC voltages • BNC connectors – Two for analog inputs – Two for analog outputs – One for triggering • Spring terminals – Eleven for analog inputs – Seven for analog controls – Seven for counter controls – Two for TTL-level power and ground signals – Eight for digital input/output (DIO) signals

说明：  针对stm32f103芯片的arm板上用于编码器转速和读取脉冲，另文件内附有硬件接线说明(The arm board of STM32F103 chip is used for encoder speed and reading pulse. Hardware wiring instructions are attached to the file.)

STC1256xxAD系列MCU实现8路PT100温度巡回检查程序，温度过高或过低报警。(STC1256xxAD Series MCU achieve 8 PT100 temperature roving inspection procedures, high or low temperature alarm.)

AT89C51SND1C方案mp3资料包括源程序与原理图(AT89C51SND1C program information, including source code and mp3 schematic)

该模块使用汇编语言设计的电压报警器，在软件proteus上仿真实现。(The module uses voltage alarm assembly language design, implementation of simulation in Proteus software.)

药品恒温箱控制程序，定义了大量的宏，希望对你有帮助(asm soft )

复旦微FM1702读卡芯片底层驱动程序，在GCC环境下编译通过，非常好用(FM1702hardware driver)

完整电能表程序，规约为电力行业标准《DL/T　645-1997　多功能电表通讯规约》，具有红外38K（1200bps），RS485通信（2400bps），具有事件记录，电量计量，密码管理等。(Complete energy meter program, the Statute of the power industry standard " DL/T 645-1997 Multimeters communications Statute infrared 38K (1200bps) RS485 communication (2400bps), event logging, power measurement, password management.)