PulseSensorAmpedHardware

51单片机门禁系统程序，门口管理机程序,RS485通信，门禁卡开关门.(51 microcontroller program entrance guard system, the management machine program, RS485 communication, entrance card open to close.)

UMAT user subroutine for ABAQUS in order to define none linear Elastic-plastic material based on the Mises plasticity and none linear isotropic hardening. This UMAT is a good example in order to learn advanced way in defining user material in abaqus finite element program.

单片机系统中经常使用键，该程序实现了ps/2键盘在的单片机系统中的应用(SCM systems often use keys, the program achieved a ps/2 keyboard in the SCM System)

包含proteus仿真文件及c语言程序，在开发板上进行过运行。利用双色LED显示电路，和四位静态数码管显示电路模拟十字路口交通信号灯。4位LED数码管显示时间，双色LED灯显示红绿灯状态。熟悉交通信号灯控制逻辑。设计一个十字路口的交通灯控制电路，要求南北方向和东西方向两个交叉路口的车辆交替运行。每次绿灯变红灯时,要求黄灯先亮3S,才能变换运行车辆。东西方向、南北方向车道除了有红、黄、绿灯指示外，每一种灯亮的时间都用数码管显示器进行显示（采用倒计时的方法）。考虑到特殊车辆情况，设置紧急转换开头。(It contains proteus simulation file and C language program. It has been run on the development board. Two-color LED display circuit and four-bit static digital tube display circuit are used to simulate traffic lights at intersections. Four-bit LED digital tube display time, two-color LED lights show the status of traffic lights. Familiar with traffic signal control logic. Design a traffic light control circuit at the intersection, which requires the vehicles running alternately in the north-south direction and the East-West direction. Every time the green light turns red, the yellow light is required to turn on 3S before changing the running vehicle. In addition to the red, yellow and green lights in the east-west and North-South lanes, the time of each kind of light is displayed by digital tube display (countdown method). Considering the special vehicle situation, set up the emergency switch start.)

DS2781测试程序，网上下载的，有一定参考价值(DS2781 test procedure)

这是小车程序，往年的比赛题目（小车过跷跷板），用的是ATmega16单片机，在CV的编译环境下。(Car program in previous years, the game title (car seesaw), ATmega16 microcontroller, CV, compiler environment)

说明：  测距超声波探头制作资料，含原理图和PCB图。(Fabrication Data of Ranging Ultrasound Probe)

存储器EEPROM AT45db081的数据读写操作,同时了解硬件spi读写操作(The data reading and writing of memory EEPROM AT45db081 , helping to understand the operation of spi)

单总线温度DS18b20程序，适用于AVR单片机。(Single-bus temperature DS18b20 procedures applicable to the AVR microcontroller.)

三相PWM整流器仿真文件，包括S函数实现，实现了四象限整流器输入电流谐波，功率因数可控，输出母线电压稳定。(Three phase PWM rectifier simulation files, including the S function, to achieve the four quadrant rectifier input current harmonics and power factor control, the output voltage stability.)