红外通讯，能够通过红外线接收和发送数据，性能可靠

对于有想自己DIY mp3的同志们要注意了，参考参考别人的设计思想也是有必要的，希望这张原理图对大家有帮助！-for a DIY mp3 to their comrades to attention, others refer to the reference design is also necessary, I hope this diagram to help you!

AVR 单片机访问SD ,已编译通过了，大家可放心下载-web is good I want code from here.thank every body.

this program tell you how to connect ps2 to a mcu(for example at89s51)-this program tell you how to connect to a ps2 mcu (for example at89s51)

为8个数码管有五种模式的闪烁方式 可以通过按键控制的，-to eight digital possession of five patterns of flashing mode can be controlled by buttons,

多用途的usb调试程序.用vb编写.可通过增加功能,变成自己的软件.-Usb multi-purpose debugger. Prepared using vb. Can increase the functionality into its own software.

74ls165控制扫描键盘，串行输出键值的c51键盘程序，并在led上显示-74ls165 control scanning keyboard, serial output of the decoder keyboard keys procedures, and led the show

Brief Introduction to C51 Language

P89CXX编程器控制CPU接收和控制程序-P89CXX Programming Control CPU to receive and control procedures

本程序可以支持SLE4442、SLE4428、FALSH、CPU卡-this program can support SLE4442, SLE4428 logic, FALSH, CPU card

C51人机接口技术，有4×4键盘程序显示及其仿真-C51 man-machine interface technology, there are 4 × 4 keyboard display and simulation