STC12C5410AD_XLF1

51单片机考勤系统下位机程序，可以配合上位机软件实现考勤功能，将hex文件下载到51单片机即可使用(51 MCU control procedures can be achieved with the PC software attendance function, the hex file into the microcontroller 51 can be used)

说明：  Ic卡 cpu 卡 发卡源程序 Ic卡 cpu 卡 发卡源程序(ic card cpucard ic card cpucard)

本系统以单片机AT89C52为核心,以数模转换器DAC0832实现方波、正弦波、三角波、锯齿波波形的输出，实现信号发生器的简易功能。(This system with single chip microcomputer AT89C52 as the core, with digital to analog converter DAC0832 achieve square wave, sine wave, triangle wave, sawtooth wave form output, realize the simple function of the signal generator.)

3.2寸宝马LPC1768开发板LED屏的基础代码(3.2-inch BMW LPC1768 development board LED screen based code )

用单片机产生频率，占空比可调的方波，这是C语言的原代码。(Produced with single-chip frequency, variable duty cycle square wave, which is the C language source code.)

基于430的DC_DC变化，采用PID控制，调节PWM的输出占公比，从而反馈调节输出电压(Based on 430 DC_DC change, using PID control, adjust the PWM output accounted common ratio, thus regulating the output voltage feedback)

实现对气体流量表的基于音速喷嘴的自动检定(testing for the gas flow meters based on stangdard acoustic nozzles)

RGB Colour Wheel for Visual Basic

说明：  看电子电路时序图如何看，这是个好方面，可以看看(Electronic circuit timing diagram to see how the look, this is a good side, you can see)

直流斩波变化的仿真和一些参考文献 可以学习一下(The simulation of dc chopper change and some references can learn )