这是一个红外报警系统，该系统通过555调制红个发光管，发出38KHZ的红外信号，对面使用一个红外接收头接收信号用来检测是否有人通过，如果有，则声光报警，...

利用89c51和8253可以测速，经初步测试可以通过-89c51 and 8253 can use guns, as a preliminary test can be

单片机音乐程序的设计与实验，包含音乐程序的设计原理。-music SCM procedures and experimental design, including music program design principles.

ADUC845单片机的一些C程序，包括AD、DA 、定时器等-ADUC845 SCM some C procedures, including AD and DA, timers, etc.

用于51系列的高精度的实用延时程序，是编程的很好参考资料。-51 for a series of high-precision delay practical procedures, programming is a good reference.

keil c51开发的8279和51单片机通用键盘控制和Led显示及uart通信程序。-Keil decoder developed by 8279 and 51 general-purpose keyboard control and Led Display and uar t Communication Program.

x9313数控电位器的驱动函数，用于程控LCD对比度，-NC Potentiometers x9313 driver function for program-controlled LCD contrast,

gp32是模托罗拉比较早的一款片子，资源较少但比较容易学习，是初学者不错的选择。-Die Torola gp32 is a comparison of the early films, but with fewer resources to more easily study is a good choice for beginners.

这是点阵程序 个人认为先学点阵再学lcd比较好 p0 p2分别接16*16点阵的高八位和低八位(纵向取模) p3口低四位接4-16线译码器（74ls154）译码器低电平为列选 消除鬼影的方法：-This is the program individual lattice lattice before you think lcd is better to learn p0 p2, respectively, then 16* 16 lattice of high and low 8 8 (vertical modulus) p3 I received a low four 4-16 Line Decoder browser (74ls154) low-level decoder for the elimination of ghosting out the election approaches:

18b20显示程序,动态显示,调试通过.-18b20 display program, dynamic display, debugging through.

带模式选择的LED显示，初学者练手必备 欢迎交流-Mode selection with the LED display, beginners welcome the exchange of the necessary training in hand