RS422 RS485 technical standards

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此程序是利用51单片机，控制蜂鸣器接口高低电平，让其发出歌声。-This procedure is the use of 51 single-chip microcomputer to control the buzzer interface high-low, so the issue of voice.

一些常用的c51源码，编程时可以参考。-some frequently used source decoder, the reference can be programmed.

DESCRIPTION This function initializes the pointers in the _pid structure 　　to the process variable and the setpoint. *pv and *sp are 　　integer pointers.-DESCRIPTION This function initializes the pointers in the _pid structure to the process variable and the setpoint.* Pv and* sp are integer pointers.

三星2410芯片中定时器和产生内部中断，及其使用-Samsung 2410 chip timers and an internal interrupt, and its use

Proteus环境下DAC0832数模转换程序与电路.-Proteus environment DAC0832 digital-to-analog conversion process and the circuit.

主要是LED屏的驱动,户外屏显示,程序中显示四个不停变化的图案.-LED screens are the main driver, outdoor screen display, the program shows the changing pattern of four non-stop.

用AVR芯片，控制12864 LCD ，程序含有，ATMEGA8535驱动KS0108的12864，并含有温度测试程序-AVR chips used to control the 12864 LCD, containing procedures, ATMEGA8535 the KS0108 driver 12864 and contains the temperature test procedure

0-99的计数器，带proteus仿真文件。-0-99 of the counter, with proteus simulation file.

在单片机系统中实现4*4的小键盘的扫描程序，按键输出对应信号，可以根据按键来设定输出对应高低电平-Single-chip microcomputer system in the implementation of the 4* 4 keypad scanning procedures, the corresponding button output signal can be output in accordance with the corresponding button to set the high-low