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键盘控制lcd1602的显示，一个按键实现位置选择，其余两个按键实现数字的加减(The keyboard control lcd1602 the show, a key position select the remaining two buttons digit addition and subtraction)

用C语言实现matlab的butter函数中低通和带通功能,高通和带阻没写,有兴趣的可以自己加入.(Using C language to achieve matlab butter function low-pass and band-pass function, high pass and band stop did not write)

说明：  四轴的简单原理图，包括Wifi模块，电源模块，通信模块等(simplified scheme layout of a four-wing drone)

freettos的最小系统移植，亲测能编译成功，使led灯周期闪烁(freertos ,stm32f103,keil5,c++)

利用STC15单片机实现对称PWM输出，可设置频率、占空比，利用JLX12863显示。( symmetrical PWM output based on STC15 MCU， frequency　and duty cycle can be setted, use JLX12863 display.)

单片机通信，vb与18b20温度传感器通信资料，包括上位机和下位机程序(Single-chip communication, vb and 18b20 temperature sensor communication data, including upper and lower machine program)

说明：  Activator for siemens simatic from ru

说明：  AT89S51demo代码，方便快速开发(AT89S51demo Code, Convenient and Rapid Development)

七、 虚拟信号采集分析器 1）：利用信号发生器产生不同信号（信号的相关参数可调） 2）：在信号上叠加白噪声。 3）：对上述信号进行采样（采样频率可调） 4）：在采样的过程中利用均值滤波（每三个点取均值） 5）：显示采样后的波形，并对其进行频率分析。 6）：将采样后的波形与原波形做比较（在同一坐标系中显示） (Seven, the virtual signal acquisition Analyzer 1): different signals generated by the signal generator (signal correlation parameters adjustable) 2): white noise superimposed on the signal. 3): the said signal is sampled (sampling frequency adjustable) 4): In the process of sampling using the mean filter (averaging three points each) 5): Show the sampled waveform and its frequency analysis. 6): the sampled waveform is compared with the original waveform (shown in the same coordinate system))

上位机，与51单片机进行通信，将从单片机发送过来获得的信息显示在显示界面上。(PC, with 51 single-chip communication, sent from the information obtained from the microcontroller is displayed on the display screen.)