单片机控制步进驱动，S1为启动，S2为停止，S3为加一，S4为减一...

水位仪通讯控制源码，主要用于水位数据的通讯-Source water level control instrument of communication, mainly used for water level data communications

电话机的工作原理,有振铃电路,电话极性保护电路,还有双音多频发送接收电路-Telephone the working principle, has ringing circuit, Phone polarity protection circuit, as well as send DTMF receiver circuit

USB程序源代码,包括PC端和单片机端.USB控制芯片为PIDUSBD12.-USB source code, including the PC client and single-chip client. USB controller chip for PIDUSBD12.

PCI总线开发 PCI总线开发-Development of PCI bus PCI bus PCI bus development development

台湾凌阳单片机SPCE061A单芯片做的一个带按健LCD显示，USB通信的一个类似于MP3的一个产品。不带FAT32的。-Taiwan Sunplus SPCE061A single chip to do with a by-LCD display, USB MP3 similar to the one in a product. Not with the FAT32.

AVR开发例程 有多种设计样例 帮你快速掌控AVR-AVR development has a variety of routines designed to help you sample the rapid control of AVR

AVR单片机入门及C语言高效设计实践（四） ATMEAG16L的I／O端口特点及使用 ATMEAG16L单片机有32个通用I／O口，分为PA、PB、PC和PD四组，每组都是8位。这些I／O口都可以通过各自的端口寄存器设置成输入和输出（即作为普通端口使用），有些I／O口还具有第二功能（我们在后面使用到这些第二功能时再介绍）。-AVR C language portal and efficient design practice (4) ATMEAG16L the I/O Ports characteristics and use of a microcontroller ATMEAG16L 32 common I/O mouth into PA, PB, PC and PD four groups, each group are eight. These I/O I can through their respective ports Register set to input and output (that is, use as a general port), Some I/O I also have the second function (in the back of the use of these second function tell).

51系列单片机实验课程：时钟程序 （显示时刻时、分、秒）-51 Series single-chip experimental curriculum: the clock program (shows time of hour, minute, second)

NE5532+TDA2030 原理图及PCB-NE5532+ TDA2030 Schematic and PCB

51+sl811读写U盘的源程序，包括USB驱动和fat文件读写程序代码-51 sl811 U-writable disc source, including the USB drive and fat document literacy program code