超声波测距模块的手动原理图程序，有绝对的参考资料。

日历时钟12887源程序，很简单但很实用，是一个很好的参考例子。-12,887 calendar clock source, which is very simple but very useful, is a good example.

PCB电路板。键盘控制，矩阵键盘的电路图。-PCB circuit boards. Keyboard control, matrix keyboard circuit.

中文版的CY7C68013Data数据手册，比较详细介绍了该芯片的功能。不过没有详细的管脚图，在英文版中可以找见-CY7C68013Data the Chinese version of the data manual, more detailed introduction of the chip functions. However no detailed pin map, we can find in the English version see

MCU与PC键盘通信程序，接口为PS/2；I2C通用驱动程序-MCU with a PC keyboard communication procedures, interface for PS/2; I2C common driver

实现交流220V市电的定时开关，可编程修改各参数，特殊情况下可强行开关。主要用于控制自助打印机系统。-AC 220V City realize the timer switch, programmable modify the parameters, special circumstances may be forced switch. Mainly used to control the printer self-help system.

pid控制的源程序，很不错的，请大家注意关注啊-pid control source, it is good, draw attention to concerns ah

S3C2440 arm9芯片上RTC的测试程序，可以测试RTC是否正确运行，以及能对RTC进行时间设置。-RTC chip S3C2440 arm9 test procedures to test whether the RTC correctly, and be able to set the RTC time.

C51程序框架生成器，主要针对51系列单片机的C程序开发，提供相关寄存器、定时器、串行接口等初始化操作，生成C程序框架。程序中附带数模转换功能。-C51 process framework generator, mainly for the 51 series MCU C application development, to provide relevant registers, timers, serial interfaces such as initialization, generating C procedural framework. Program with digital-analog conversion.

用单片机设计电子音乐门铃，除了各个子程序外还包括音符节拍码数据表。 -Designed with single-chip electronic music doorbell, in addition to various routines, but also including key data sheet music beat.

lcd keyboard example