DDS

实现电子钟功能 ，可设置闹钟，有闹铃，可设置时间和闹钟时间(Implement electronic clock function, can set the alarm clock, alarm clock, can be set up time and clock time)

说明：  在个是AVR的PDF介绍，内容很详细，也很好，特别适合初学者入门的学习(Here is the introduction of PDF of AVR, which is very detailed and very good. It is especially suitable for beginners to learn.)

数字电子时钟是一种使用数字电路技术实现时钟、分钟和秒钟定时的设备。 它在其他电子时钟中具有更高的准确性和主观性。数字钟包含扩展功能和基本功能。其中，基本功能部分：以数字形式准确定时，显示时、分、秒的功能; 扩展功能部分： 日期显示、闹钟、温度显示。(A digital electronic clock is a device that uses digital circuit technology to achieve clock, minute, and second timing. It has higher accuracy and subjectivity in other electronic clocks. The digital clock has two parts, basic functions and extended functions. Among them, the basic function part: accurate timing in digital form, display hours, minutes, seconds function; extended function part: date display, alarm clock, temperature display.)

说明：  基于51单片机的继电器例程，常见问题： 1. 按下按键无效果 确保连线正确 换根杜邦线试试 将单片机拆下来重新安装下，重启开发板(Relay Routine Based on 51 Single Chip Microcomputer, Frequently Asked Questions: 1. Pressing the key has no effect Make sure the connection is correct Try changing the dobang line Remove the microcontroller and reinstall it, restart the development board.)

电子时钟程序，通过VC++编程，实现电子时钟程序，方便编程爱好者交流学习。(Electronic clock procedures, through VC++ programming, electronic clock procedures to facilitate the exchange of learning programming enthusiasts.)

pic16f616红外遥控调节PWM占空比(the pic16f616 infrared remote control to adjust the PWM duty cycle)

51单片机DDS函数信号发生器 12864显示频率(51 SCM dds signal generator)

virtools教程 初级程序 vt初级基础教学学习资料 (Virtools tutorial primary program vt primary basic teaching learning materials)

线路板pcb的电磁兼容设计需要注意到若干问题，怎么处理里面都有详细说明。(PCB pcb EMC design needs to be noted, a number of issues, which have dealt with how detailed description.)

a program which demonstrates how a FORTRAN main program can declare an allocatable array, pass it to a subroutine, which can then allocate it and fill it with data, and then return the allocated and initialized array to the calling program