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avr单片机串口通信源代码，调试成功，可参考试用(avr microcontroller serial communication source code, debugging success, refer to the trial)

对各种PID 控制算法的详细说明描述，并比较各种PID的用法(Detailed description of the PID control algorithm described in age and compare the usage of the PID)

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.

利用51单片机做电阻测量仪，实现按键设置阻值自动报警提示(The use of 51 single-chip resistance measuring instrument to achieve automatic alarm button to set the resistance)

说明：  基于STM32F429实现以太网应用--LWIP移植(无操作系统)(Implementation of Ethernet Application Based on STM32F429--LWIP Porting (No Operating System))

说明：  答题器源码，用51单片机控制的。具体内容自己下载看吧(Answer source browser, with 51 single-chip control. Download and see the specific content of their own)

说明：  多功能电子钟的程序，基于ATM89C51单片机，可以实现时间走动、显示、日期显示、闹铃功能，欢迎下载(The program of multi-function electronic clock, based on ATM89C51 single chip computer, can realize the functions of time walking, display, date display and alarm. Welcome to download.)

说明：  用实验板拨打电话或手机,是开发板的程序,大家可放心用(Using the experimental plate or phone call is the development board s procedures, you can rest assured that with)

介绍AVR单片机的功能，使用方法，对初学者很有帮助(Introduction AVR microcontroller features, use, very helpful for beginners)

direct sparse solver for linear equations