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单片机at89c52控制步进电机，愿跟大家一起分享(Microcontroller at89c52 control stepper motor, is willing to work with you to share with)

Foreword The use of reprogrammable memory technology in vehicle electronic control units (ECUs) has increased in recent years, and is expected to continue in the future. Use of this technology has increased the flexibility of being able to use a single ECU hardware part to be used in many different vehicle configurations, with the only difference being the software and calibrations programmed into the unit. Reprogramming of those ECUs in the service environment also allows for ease of field modification of system operation and calibrations. Variations in reprogramming capability and the multiple tools necessary to reprogram vehicles are a burden on aftermarket repair facilities that service different makes of vehicles.

说明：  下面的程序利用友元函数求两点间的距离。请你将有关的程序补充完整，并总结为什么这里要用友元函数来求两点间的距离。(using friend to get the result.)

Visual C++数据库编程与实例 pdf超高清电子版与原书光盘，非常不容易搞来的，福利来啦！200多M，只能分割，敬请见谅！主卷是VisualCDatabaseProgramAndExamples.zip，还需要下载12个分卷，此为第5分卷(Visual C++ database programming with examples pdf electronic version of ultra-high-definition optical disc with the original book, is not easy to engage in, and benefit coming! More than 200 M, only split, please forgive me!)

由于太阳能充电系统多在户外，为了方便研究太阳能充电控制系统对蓄电池的充电情况，本文使用GPRS无线传输技术，设计了一套太阳能充电系统蓄电池的充电电压电流远程实时监测系统。系统的硬件部分由电压电流检测电路、单片机STC89C52RC、GPRS模块SIM300以及相应的外围电路构成，下位机软件由C语言编写并与硬件部分构成系统下位机部份，实现了对充电电压电流的信息采集以及数据的无线数传。上位机在LabVIEW2010环境下编写，具备友好的人机交互界面，实现了数据的远程接收、实时显示、数据库管理、报表生成和打印等功能。经过系统测试系统实现了对电压电流的远程监测。(As the solar charging system more outdoors, in order to facilitate the study of solar charge control system for charging the battery case, we use GPRS wireless transmission technology, we designed a solar charging system battery charge voltage and current remote monitoring system. The hardware part of the system by the voltage and current detecting circuit, microcontroller STC89C52RC, GPRS module SIM300 and corresponding peripheral circuits, lower computer software written in C language and hardware parts lower position machine part of the system, the realization of the charging voltage and current information collection and wireless data transmission of data. PC at LabVIEW2010 prepared environment, with friendly interactive interface, realize the remote receiving data, real-time display, management, report generation and printing. After the system test system enables remote monitoring of voltage and current.)

基于stm32的bldc驱动，有hall位置传感器，电流传感器采样，方波驱动。(Based on stm32 BLDC drive motors, hall position sensor, current sensor sampling, square wave drive.)

21天学通51单片机开发源代码，学习51单片机的教材，值得下载(21 Days 51 MCU development of source code, 51 MCU learning materials, worth downloading)

温湿度检测 AM32101温湿度传感器 可以检测(Temperature and humidity sensor temperature and humidity testing AM32101)

单片机实验中的键盘扫描实验，用lcd1602液晶显示屏显示按键值，c语言编写(for 51)

用共阴极数码管做的密码锁,可修改密码 ( this is a codelock )